I recently read an article about how RL-17 is the new wonder powder for large bore magnums and some confirming internet posts about the use of it for the 375 Ruger. I am on the verge of loading a couple hundred rounds of 416 Ruger with RL-15, but hesitate to see if I should try the new RL-17.

Anyone have any experience or know why I should?

Joe
I have no idea about 416 Ruger. I have used RL 17 in 300 WSM, 375 H&H and 404 Jeff with good results. I did not like it in 450/400....

If it works in the 375's and 404, I don't see a reason it would not work in the 416 Ruger. The Superformance powder is now available as well, I'm pretty sure that is what Hornady is loading the factory ammo with, and I have seen people make very similar comparisons to RL17/Superformance....so, give it a shot!

Can anyone tell me what a safe starting load for RL-17 in the 416 Ruger with a 400 grain Nosler Partition. I was thinking that since several folks like 81 grains in the 375 that I would drop down to 73 grains to start, but the more I think about it, the more nervous I get. Is there a computer program that could give an idea of a good starting point?

it is likely too slow for a 20" barrel ..
its not likely to provide you top vels.. but is likely to minimize shot to shot vel variation

For what's worth.

Cartridge : .416 Ruger
Bullet : .416, 400, Nosler PART 45200
Useable Case Capaci: 79.414 grain H2O = 5.156 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 20.0 inch = 508.0 mm
Powder : Alliant Reloder-17

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-10.0 89 68.40 2074 3820 41826 8264 97.0 1.323
-09.0 90 69.16 2096 3904 43169 8353 97.4 1.304
-08.0 91 69.92 2119 3988 44557 8439 97.7 1.285
-07.0 92 70.68 2142 4074 45989 8521 98.0 1.266
-06.0 93 71.44 2164 4160 47474 8601 98.3 1.248
-05.0 94 72.20 2187 4247 49009 8677 98.6 1.230
-04.0 95 72.96 2209 4335 50595 8749 98.8 1.212
-03.0 96 73.72 2232 4424 52238 8818 99.1 1.195
-02.0 97 74.48 2254 4513 53937 8883 99.3 1.178 ! Near Maximum !
-01.0 98 75.24 2277 4603 55698 8945 99.4 1.161 ! Near Maximum !
+00.0 99 76.00 2299 4694 57519 9002 99.6 1.144 ! Near Maximum !
+01.0 100 76.76 2321 4785 59408 9056 99.7 1.128 ! Near Maximum !
+02.0 101 77.52 2343 4878 61365 9106 99.8 1.112 !DANGEROUS LOAD-DO NOT USE!
+03.0 102 78.28 2366 4970 63391 9151 99.9 1.097 !DANGEROUS LOAD-DO NOT USE!
+04.0 103 79.04 2388 5064 65494 9193 100.0 1.081 !DANGEROUS LOAD-DO NOT USE!
+05.0 104 79.80 2410 5158 67676 9230 100.0 1.066 !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 99 76.00 2393 5088 68534 8637 100.0 1.066 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 99 76.00 2163 4154 47546 8923 94.9 1.246

Thank you Paul. I very much appreciate your help. If I understand your data, then the minimum charge is 68.4 grains and the maximum charge is 73.72 grains without warning and 74.48 - 76.76 with warning. Above that is stupid. Did I get that right?

quote:

If I understand your data, then the minimum charge is 68.4 grains and the maximum charge is 73.72 grains without warning and 74.48 - 76.76 with warning. Above that is stupid. Did I get that right?

Sort of. QL uses what it believes is the std burn rate for RL17. The data I gave you was what it calculated using that data. Dangerous kicks in at max Std pressure which in the 416 Ruger case is 62,000. I had imputed 76grs as my load in question and it then reduces and increase that load by 1% incraments.

If you read their disclaimer they state burn rate can vary up to 10%. I've never see it that high but they cover their butt. So they state that my 76gr load could actually be either 68534 or 47546 depending on what the burn rate is. Part of the same reason why one shooters load might be above book and the next max out below.

This is simply another piece of data. Start low and work up. I've found many powders very close to my actual results. A couple were about 2-4 grs off. I've never used RL17 so I have no clue how close their burn rate is. I know some have posted here on AR with idfferent results but I can't remember which direction.

Jeff: If R-17 is too slow, what powder to you recommend as ideal? Do you think a temperature insensitive powder a good idea for the 416 Ruger in Africa in August? Thanks for the help.

quote:

Jeff: If R-17 is too slow

Simple QL with a 400part showing top velocities and powder in a 20" barrel I saw mentioned. RL is #6 out of the powders listed in QL. This is only the top of the list.
Cartridge : .416 Ruger
Bullet : .416, 400, Nosler PART 45200
Useable Case Capaci: 79.414 grain H2O = 5.156 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 20.0 inch = 508.0 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 62000 psi, or 427 MPa
or a maximum loading ratio or filling of 115 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

5 loads produced a Loading Ratio below user-defined minimum of 75%. These powders have been skipped.
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Somchem S365 113.5 82.6 5.35 2384 100.0 62000 9054 1.107 !DANGEROUS LOAD-DO NOT USE!
Norma MRP 115.0 87.8 5.69 2366 96.5 57991 10363 1.131 ! Near Maximum !
Ramshot Hunter 110.3 83.4 5.40 2359 98.3 62000 9573 1.112 !DANGEROUS LOAD-DO NOT USE!
Hodgdon H414 104.2 80.7 5.23 2351 97.6 62000 9508 1.116 !DANGEROUS LOAD-DO NOT USE!
Winchester 760 104.2 80.7 5.23 2351 97.6 62000 9508 1.116 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-17 101.3 77.8 5.04 2350 99.8 62000 9121 1.107 !DANGEROUS LOAD-DO NOT USE!
Norma URP 110.0 79.6 5.16 2349 99.4 62000 9258 1.118 !DANGEROUS LOAD-DO NOT USE!
Bofors RP19 ~approximation 110.0 79.7 5.16 2349 99.4 62000 9255 1.118 !DANGEROUS LOAD-DO NOT USE!
Accurate 4350 114.4 80.1 5.19 2349 99.5 62000 9238 1.130 !DANGEROUS LOAD-DO NOT USE!
Vihtavuori N550 106.7 79.8 5.17 2348 99.3 62000 9378 1.124 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-19 114.7 84.0 5.44 2343 95.6 62000 9631 1.111 !DANGEROUS LOAD-DO NOT USE!
Ramshot BigGame 102.5 77.5 5.02 2335 99.9 62000 8944 1.121 !DANGEROUS LOAD-DO NOT USE!
SNPE Vectan SP 11 102.7 77.6 5.03 2334 99.9 62000 8932 1.121 !DANGEROUS LOAD-DO NOT USE!
IMR 7828 SSC 115.0 86.5 5.60 2331 92.8 60335 9867 1.118 ! Near Maximum !
ADI AR 2209 113.4 82.6 5.35 2330 95.3 62000 9489 1.109 !DANGEROUS LOAD-DO NOT USE!
IMR 4831 115.0 80.6 5.22 2326 99.4 61063 9046 1.134 ! Near Maximum !
Bofors RP14 ~approximation 115.0 84.2 5.46 2326 95.4 61061 9513 1.119 ! Near Maximum !
IMR 4895 98.8 72.4 4.69 2319 99.9 62000 8810 1.134 !DANGEROUS LOAD-DO NOT USE!
Bofors RP4 ~approximation 112.1 82.0 5.32 2318 95.3 62000 9313 1.115 !DANGEROUS LOAD-DO NOT USE!
Norma 204 108.5 82.0 5.32 2318 95.3 62000 9313 1.115 !DANGEROUS LOAD-DO NOT USE!
Raufoss RA4 112.1 82.0 5.32 2318 95.3 62000 9313 1.115 !DANGEROUS LOAD-DO NOT USE!
Somchem S385 115.0 85.1 5.51 2315 96.6 61226 9265 1.131 ! Near Maximum !
Hodgdon BL-C2 94.3 75.3 4.88 2311 100.0 62000 8611 1.136 !DANGEROUS LOAD-DO NOT USE!
Norma 203B 100.2 73.3 4.75 2311 99.9 62000 8712 1.135 !DANGEROUS LOAD-DO NOT USE!
Bofors RP4 NT ~approximation 109.7 81.5 5.28 2310 97.1 62000 9111 1.125 !DANGEROUS LOAD-DO NOT USE!
Bofors RP11 ~approximation 99.6 72.9 4.73 2310 99.8 62000 8765 1.135 !DANGEROUS LOAD-DO NOT USE!
Raufoss RA11 99.6 72.9 4.73 2310 99.8 62000 8765 1.135 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-15 99.6 72.9 4.73 2310 99.8 62000 8765 1.135 !DANGEROUS LOAD-DO NOT USE!

The first list was up to 115% capacity if you limit to 100% the RL17 is number 1

Cartridge : .416 Ruger
Bullet : .416, 400, Nosler PART 45200
Useable Case Capaci: 79.414 grain H2O = 5.156 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length : 20.0 inch = 508.0 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 62000 psi, or 427 MPa
or a maximum loading ratio or filling of 100 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

5 loads produced a Loading Ratio below user-defined minimum of 75%. These powders have been skipped.
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Alliant Reloder-17 100.0 76.8 4.98 2322 99.7 59478 9058 1.127 ! Near Maximum !
IMR 4895 98.8 72.4 4.69 2319 99.9 62000 8810 1.134 !DANGEROUS LOAD-DO NOT USE!
Hodgdon BL-C2 94.3 75.3 4.88 2311 100.0 62000 8611 1.136 !DANGEROUS LOAD-DO NOT USE!
Bofors RP11 ~approximation 99.6 72.9 4.73 2310 99.8 62000 8765 1.135 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-15 99.6 72.9 4.73 2310 99.8 62000 8765 1.135 !DANGEROUS LOAD-DO NOT USE!
Raufoss RA11 99.6 72.9 4.73 2310 99.8 62000 8765 1.135 !DANGEROUS LOAD-DO NOT USE!
Norma 203B 100.0 73.2 4.74 2307 99.9 61698 8705 1.138 !DANGEROUS LOAD-DO NOT USE!
Winchester 748 91.7 72.3 4.68 2303 100.0 62000 8265 1.130 !DANGEROUS LOAD-DO NOT USE!
Hodgdon H4895 96.0 70.3 4.56 2295 100.0 62000 8478 1.138 !DANGEROUS LOAD-DO NOT USE!
PB Clermont PCL 516 97.2 75.8 4.91 2294 99.1 62000 8727 1.131 !DANGEROUS LOAD-DO NOT USE!
ADI AR 2206H 96.3 70.5 4.57 2292 99.9 62000 8523 1.138 !DANGEROUS LOAD-DO NOT USE!
SNPE Vectan SP 9 97.0 73.4 4.75 2289 99.9 62000 8478 1.133 !DANGEROUS LOAD-DO NOT USE!
IMR 3031 99.4 68.0 4.41 2286 100.0 62000 7809 1.138 !DANGEROUS LOAD-DO NOT USE!
Accurate 2520 96.6 72.8 4.72 2283 100.0 62000 8027 1.149 !DANGEROUS LOAD-DO NOT USE!
Hodgdon H380 100.0 74.8 4.85 2281 99.0 60182 8786 1.153 ! Near Maximum !
Ramshot BigGame 100.0 75.6 4.90 2280 99.7 57138 8819 1.161 ! Near Maximum !
PB Clermont PCL 507 93.5 71.4 4.63 2280 100.0 62000 8219 1.136 !DANGEROUS LOAD-DO NOT USE!
Ramshot TAC 90.9 71.3 4.62 2279 100.0 62000 8199 1.137 !DANGEROUS LOAD-DO NOT USE!
Somchem S321 91.7 72.2 4.68 2279 100.0 62000 8244 1.142 !DANGEROUS LOAD-DO NOT USE!
Somchem S341 95.3 75.1 4.86 2277 99.9 62000 8259 1.134 !DANGEROUS LOAD-DO NOT USE!
SNPE Vectan SP 11 100.0 75.6 4.90 2276 99.6 56858 8800 1.164 ! Near Maximum !
SNPE Vectan SP 7 95.1 74.7 4.84 2275 99.1 62000 8500 1.143 !DANGEROUS LOAD-DO NOT USE!
Norma 203 old 100.0 74.0 4.80 2271 100.0 58392 8534 1.174 ! Near Maximum !
Vihtavuori N530 92.6 68.1 4.41 2269 100.0 62000 8089 1.138 !DANGEROUS LOAD-DO NOT USE!
Vihtavuori N540 99.2 73.4 4.76 2266 100.0 62000 7997 1.142 !DANGEROUS LOAD-DO NOT USE!
IMR 4320 100.0 72.0 4.67 2263 99.8 59013 8363 1.146 ! Near Maximum !
Norma 201 93.3 69.8 4.52 2263 100.0 62000 8090 1.152 !DANGEROUS LOAD-DO NOT USE!
Hodgdon H335 87.4 69.8 4.52 2262 100.0 62000 7834 1.140 !DANGEROUS LOAD-DO NOT USE!
Lovex-S0621 100.0 71.2 4.61 2262 100.0 60840 8122 1.156 ! Near Maximum !
Accurate 2495 99.0 68.6 4.44 2261 100.0 62000 7684 1.174 !DANGEROUS LOAD-DO NOT USE!
Norma 202 96.8 69.7 4.52 2261 100.0 62000 7815 1.145 !DANGEROUS LOAD-DO NOT USE!
SNPE Vectan SP 10 87.0 68.0 4.41 2258 100.0 62000 7783 1.143 !DANGEROUS LOAD-DO NOT USE!
PB Clermont PCL 508 86.9 68.1 4.41 2257 100.0 62000 7773 1.143 !DANGEROUS LOAD-DO NOT USE!
Rottweil R902 99.3 70.1 4.54 2256 100.0 62000 7986 1.153 !DANGEROUS LOAD-DO NOT USE!
Accurate 2460 90.4 71.0 4.60 2252 100.0 62000 7814 1.157 !DANGEROUS LOAD-DO NOT USE!
Hodgdon H414 100.0 77.4 5.02 2251 96.1 53715 9173 1.189 ! Near Maximum !

quote:

Originally posted by bobmn:
Jeff: If R-17 is too slow, what powder to you recommend as ideal? Do you think a temperature insensitive powder a good idea for the 416 Ruger in Africa in August? Thanks for the help.

ah, perhaps this slipped your mind - Africa in august is WINTER
bulawayo, zim, today , is 90f.
http://www.uyaphi.com/zimbabwe/weather.htm
august will be something like 68-70f for the highs.

the 416 ruger is smaller than the 416 AccRel .. and I use h335 in all my carts as the preferred powder.. *I* feel less powder means less recoil.

so, the powder i would suggest is h335.. and i would suggest building your loads NOW for your africa trip..

jeffe

quote:

*I* feel less powder means less recoil.

so, the powder i would suggest is h335.. and i would suggest building your loads NOW for your africa trip

I "feel" more powder is more recoil as well. Guess it depends on what you are striving for. MAX (calculated velocity) or an acceptable velocity while trying to minimise your recoil. Powder charge for H335 would be around 10% less the RL17. The recieving end would not know the 50-60fps less velocity.

Was I right to run the loads using a 20" barrel???

In my case 20" is the appropriate selection. Thank you.

Ramrod: Thanks for the QL data. As I examined the data I noticed that the 62,000 psi load for RL-15 was 72.9 grains for 2315 fps. When I compared it to the loading data that I got from Hornady, they listed a max of 75.5 grains of RL-15 for a velocity of 2250 fps. Than I realized that QL was a 400 grain Partition spitzer and the Hornady data was a 400 grain round nose. I assume that the round nose effectively increases case capacity by having more bullet outside the case with the same OAL.

Jeffe: Thanks for the info. What is the case capacity in grains of water to the base of the neck in the 416 AR? I measured the 416 Ruger and the 416 Remington the same at 89 grains.

Jeffe and Ramrod: The formulas for recoil includes powder as a component of ejecta so I assume that the the difference in 10 grains of powder would be almost the same as increasing the bullet weight from 400 grains to 410 grains. Disregarding jet effect at the muzzle, do you think you would notice the difference in recoil or muzzle rise in loads that differ only by 10 grains of powder when firing at a cape buffalo?

quote:

Than I realized that QL was a 400 grain Partition spitzer and the Hornady data was a 400 grain round nose.

At an OAL of 3.34 the Hornady RN will have a net capacity 5gr (6%) larger than the 400gr Part. As to QL and RL 15 I've found it a touch hotter than my actual velocity measurements. Either way a load for the RN used with the Part might cause pressure issues. The jump is 6-7000psi caused by the reduced net capacity. (at least as calculated)

Different powder lotts, bullet jump, What max pressure did Hornady actaully load too? All would effect the differences.

Ramrod: Unfortunately Hornady did not provide any pressure data with the very limited loading data they provided. I have not found any loading data for the 416 Ruger which includes pressure data. Thanks for all the info you have posted. Because case capacity for the 416 Ruger is almost the same as the 416 Remington I thought the 416 Remington data would be a good place to start. However, there is very limited 416 Remington data for newer powders probably due to the lack of factory rifles chambered in recent years.

quote:

Originally posted by bobmn:
Jeffe: Thanks for the info. What is the case capacity in grains of water to the base of the neck in the 416 AR? I measured the 416 Ruger and the 416 Remington the same at 89 grains.

off the top of my head, 6-8 grs larger than the 416 rem ..

QL shows full capacity as the 416Rem mag being 3 grs larger. Have no clue as to the capcity at the base of the neck.

FWIW, my tests with RL-15 in the 416 Ruger using the 400 grain Nos Part, seated to an OAL to the ogive @ 2.683", Fed 215M primers, temps in the upper 30's F, calm:

75.8 - 2316 fps avg w/ 4 shot group SD 39
76.0 - 2351 fps avg w/ 4 shot group SD 9
76.2 - 2324 fps avg w/ 4 shot group SD 15
76.4 - 2330 fps avg w/ 4 shot group SD 13

Because I was seeing little to no incremental increase in velocity with increases in powder load is why I started to think about trying another powder. When I saw some articles and posts about how much others have liked RL-17 for the 375 Ruger, I thought possibly I should give it a try.

quote:

.8 - 2316 fps avg w/ 4 shot group SD 39
76.0 - 2351 fps avg w/ 4 shot group SD 9
76.2 - 2324 fps avg w/ 4 shot group SD 15
76.4 - 2330 fps avg w/ 4 shot group SD

In the for what it's worth department. If I slow QL RL15 down a touch so 75.8 gives me 2316 using an oal of 3.34" it says 76.4 would give 2336 and pressure of 62992. I have no clue what OAL you have.

Using RL17 loaded to the same pressure calculates 2360 using 78.1 grs. Per QL compared to what it called the best powder you are only leaving maybe 30 fps on the table with the best load of RL17 and 55 from your RL15 load.

Me I would find my accurate load in the 2320fps range and go hunting.

Ramrod, you have been so much help and one of the most interesting posters I have enjoyed exchanging information and ideas with. I appreciate your fact based insights.

Glad I helped a little.

Mighty Joe,

Do you have a link or reference to the article on Rl-17 and magnums?

Thanks in advance.

I amsorry, the article I read was over a month ago and I believe I had googled 375 Ruger and found that article among many others, although not all extolling RL-17. There also many posts on various sites indicating the same.

Although, I have now proved to myself that RL-17 is not the powder for the 416 Ruger. Jeggeosso was spot on in that RL-17 is too slow. Here are my results.

400 gr Nos Part, Fed 215M primer, RL-17 Powdwer:

73 gr, M=2022 fps, SD 14
74 gr, M=2056 fps, SD 6
75 gr, M=2097 fps, SD 7
76 gr, M=2127 fps, SD 16
77 gr, M=2163 fps, SD 2

77gr began to show some flattening of the primer and the beginning of bolt stick. Accurracy for all those loads was pretty good. On to the next project.

Very intersted in this thread. I have a 416 ruger in the safe and want to load some 400 grainers. What is the best powder to use to achieve 2350ish out of the 20" barrel? I'm just now getting to this rifle and have not fired a round through it yet. Thanks.

RPW, Jeffeoso believes H335 is good. I am probably going back to RL-15 as I had decent results in the 2300+ fps range. I was simply chasing a windmill.

quote:

Originally posted by MileHighShooter:
If it works in the 375's and 404, I don't see a reason it would not work in the 416 Ruger. The Superformance powder is now available as well, I'm pretty sure that is what Hornady is loading the factory ammo with, and I have seen people make very similar comparisons to RL17/Superformance....so, give it a shot!

Guys, I have to say that I have been really confused about Hodgdon's Superperformance powder and the Horndy ammo that it is supposedly used in. If you go to the Hodgdon web site, you will find the following quote regarding Superperformance Powder:

"The list of cartridges and bullets is limited with this highly specialized powder, but where it works, it really works!"

Then, Hodgdon only provides load data up to light bullets in the 30 caliber. Does anybody have a new Hornady manual? Is there more load data for this stuff?

Dave, I have the new manual. The is very little 30 cal data using Superperformance. What specifically would you like me to look up?

Joe:

Do they have anything for the .338 Ruger Compact Magnum with either 200, 210, or 225 grain bullets? How about the 9.3X62 with a 286 grain bullet?

There are no Superperformance recommendations for either cartridge.

For the 338 RCM: Hornady recommends VIHT N-550 for the 200 gr and up in the text.

200 gr: N-550 62.8 gr max load for 2800 fps
Win 760 65.3 gr max load for 2850 fps
210 gr: No data
225 gr: N-550 58.5 gr max load for 2650 fps, which also is the fastest load given. Most of the other powders listed drop down to 2600 fps.

Only two loads for the 9.3 x 62 with a 286 grain bullet achieve 2400 fps as a max speed & max load: 60.4 gr of Win 748 and 62.4 gr of 2000 MR.

Thanks Joe I want to try RamShot Big Game 1st since I have plenty of it. and Ramshot provides data. Accurate powder also has data. There is also an article on Real Guns about loading this cartridge and H414 can push a 215 grain bullet at nearly 2800 fps out of a 20 inch barrel!

quote:

The first list was up to 115% capacity if you limit to 100% the RL17 is number 1

99-103% capacity is usually pretty reliable in most cartridges/calibres.

I use R17 in the 416 Rigby because it fits nicely in the case and is more compact than some slightly slower powders. R17 produces nice 2800fps loads with 350 TSX bullets in my 416 Rigbys.

However, Jeffeoso may be right about being too slow for a case that is over 20 grains smaller than the 416 Rigby. You will need to test first. I would aim for loads that produce about 5000 ft lbs in the 416Ruger. Those would likely be safely under 62k with the appropriate powder. The Quikload data listed above seemed overly conservative for the R17 that I have worked with.