JFR,



The 416 Rigby load is: 410 Woodleigh SP at 2370 fps with a peak average chamber pressure of ~ 48,000 psi.



My 24" barreled Ruger RSM, 416 Rigby will launch a 410 Woodleigh at 2377 fps with a measured chamber pressure of 50892 psi. I use 101 gr of IMR4350 to achieve this ignited with a CCI250 primer, in Norma cases.



You will be hard pressed to achieve this with a 416 Rem magnum. Don't get me wrong, you can get 2370 fps, just not at 48,000 psi.



The Hodgdon data, previously posted, states 2400 fps @ 46000 CUP, which in your 416 Rem correlates to about 58,000 psi. The Hodgdon data further specifies @ 2350 fps a chamber pressure of 44,000 CUP, which in the 416 Rem is about 55,000 psi.



Just ran a quick simulation:



Best guess here, but should be within +/- 40 fps.



410 Woodleigh

88 gr of powder (H414 compressed)

Chamber pressure - 49,000 psi +/-

24" barrel

Muzzle velocity - 2235 fps



Faster powders result in lower velocities, when held to a peak average pressure of 49,000 psi.



Good luck with your quest.



Scott

win 760 is also a great powder for 416 rem... try the hornady STARTING load

jeffe

Thanks for all the help!
Does anyone know if the factory load in .416 Rigby is 40,000 cup or 40,000 psi?


I dont really have any pressure probs in my Number 1 if the case OAL is kept at 3.60 (loaded it .050 off the lands once with a max load of 84g R15 and a 350g XBullet;very accurate but in the Mojave desert in late july it extracted to hard).

I am trying the low pressure load approach mostly because the 400g factory Rigby load is such a great round in the first place; the second is I figure that lower pressure=longer case life.

I'll work up some loads and see what I come up with.

JFR

The rigby is in cup, which is in the ball park for 47000psi.

jeffe

Ok, My loads were as follows out of a Winchester Model 70 with a 24" barrel all with virgin Remington brass, Fed 215 primers and RL15
Barnes X 350gr no cannelure OAL 3.6 80 grs avg 2527fps
all the following were seated to the cannelure
Speer 350gr Hotcor Magtip 78grs avg 2446fps
Speer 350gr Hotcor Magtip 80gr avg 2492fps
Hrdy 400gr RNSP 78gr avg 2384fps
Hrdy 400gr RNSP 80gr avg 2454fps
I don't know what the pressures are but the brass is cool to the touch and shows no signs of pressure. For a reference on the speed Remington factory with 400gr Barnes solids went 2431fps and Federal 400gr Bearclaws made 2435fps out of my barrel the same day. Interestingly all the reloads seemed milder then the factory with the 78gr loads not being bad at all to shoot.
Jason

Thanks, Sharps54

I have had good luck using 79.5g of R15 with the 350g Magtip. I'll try the 78g load with both the 350g Magtip and some 400g Supersolids.

Thanks again!

JFR

I read through this pretty quickly, and I didn't see anyone point out the obvious: the 416 Rem case is quite a bit smaller than the Rigby. Don't cross loads from one to the other.



For lowest pressure with a load that hits 2370 fps with a charge that fits in the case, Quickload comes up with:

416 Rem Mag

24 inch bbl

3.6 COL

400 grain HDY RN



Hodgdon H414

94.9% of case capacity

82.4 grains

2370 fps

97.3 % burnt

49976 PSI max

9095 muzzle PSI

1.348 msec barrel time.



Hodgdon does not list H414 for the 416 Rem, it lists H380 as hitting your velocity at 46400 CUP. I've used H380 with the 416 Rem and it seemed to give me good accuracy (for a Barnes bullet), but the pressure signs were all over the map. I was using Barnes solids and the extreme copper fouling may have been a contributing factor to the seemingly random pressure signs. I did not have the pressure signs with other powders, though.



IMR4350 (compressed) and VV N550 also both look good on Quickload. YMMV.



I settled on 72 grains of IMR4895 with the 400 grain Hornady and got good accuracy, low fouling and 2350 fps. Quickload says this velocity comes from about 54000 PSI max.



BTW 78 grains of RL-15 behind a 400 grain bullet theoretically puts you at 64000 PSI max. Not exactly a low-pressure load.



I will try to find my loading book in this boar's den for some other loads, but the IMR4895 fits lots of my cartridges pretty well and I settled on it for the long run in the 416 Rem.



HTH,



Don

Yeah Don...I know not to use the Rigby loads in the Rem case. I havent had THAT much to drink yet

In the Hodgdon manual, R19 looks like, at a maximum of 90gs, the best bet of 2370fps at 44,600 cup. I just wonder if I can actually fit 90gs in the Rem case with a 400g bullet keeping to an OAL of 3.600.

Thanks for the reply.

JR

Don,
"BTW 78 grains of RL-15 behind a 400 grain bullet theoretically puts you at 64000 PSI max. Not exactly a low-pressure load. "
I don't have quickload and am at work right now but if I remember right 78 gr of RL15 is still under the recommended max load in the books. I will verify tonight, but I know Ray Atkinson has used this load for quite some time. I would be interested in other's feedback here but I have not seen any pressure signs with 80 gr much less 78gr of RL15.
Jason

Jason,

Let me know what you find out. I will re-run my simulation later tonight. I have not shot this load (for obvious reasons...)

64000 PSI is right on the limit of brass expansion for a lot of cases, so you might not see any signs of over-pressure with this load (but I think it's there.)

Don_G

With the 350 gr Speer mag tip I use 76 grs of Reloader 15 to get 2400 fps.I backed down to 76 grs of R-15 with the 410 grain woodleigh.I think the Woodleigh 410 gr has alot more bearing surface on the rifling than the 400 gr bullets.I know it feels like it kicks alot harder than the 400 gr bullets.The BarneS Monolithic with 78 grs of r-15 shot very well.The 350 gr load I reloaded the brass 17 times .Its pretty accurate load.The 410 gr woodleigh bullets were as accurate as the speer 350 gr mag tips.I like Reloader -15 because I can use it on all weights of bullets from 300,325,350,400 and 410 and get very good accuracy with this powder.

I checked the Alliant powder site. They say 82 gr of RL-15 is max load for a 400 gr HDY RN, at 2444 fps and 51,700 CUP.



There's not a universal pressure conversion from CUP to PSI, but 1.18 is usually considered in the ball park.



That'd be 61,000 PSI, the cartridge's rated max is 62,366 PSI. [edit - 62366 is an old number, I found one site that lists the current SAAMI max as 65000 PSI] So it'd be legal, but not much safety factor.



QuickLoad says 82 grains hits 75,000 PSI and 2589 PSI. Obviously there's a disconnect somewhere - and probably in QuickLoad.



Interestingly - considering other threads on the use of chrono's - when I find the load that yields 2444 fps in QuickLoad, the peak pressure is reported as 60,400 PSI -very close to what Alliant is reporting.



Another argument for stopping when you reach the manufacturer's velocity (if not before.)