anyone have any reloading data on this round? i am trying to decide if it is worth the extra powder as opposed to the 7mm stw. thanks, victor

I own a 7mmrum and two stw's.I get 50 fps more from the rum over the stw's.I much prefer the stw's and feel that the rum case is too large for any real advantage with the 7mm bore.The rum cases really begin to shine with the .308" bore.

No real difference in performance or cost, but I prefer the RUM beltless cases. Both IMR (www.imrpowder.com) and Hogdon (www.hogdon.com) have data online.

bigbore --- I am shooting a 7mm Rum for a buddie. This past weekend was my first session. I started at 90 grains of H-1000 Fed 215M primer and Rem brass with 160 grain North Fork bullet. The scope is a 4.5 X 14 Ziess Conquest and I was very impressed indeed. ----- Best group 1 inch while breaking in the rifle with cleaning between shots. Hottest round 3492 fps at 93 grains of H-1000 with slight signs of pressure on two out of six rounds. Average speeds around 3320 fps with the hottest load. I was very pleased with the accuracy, even while breaking in the barrel and moving the group on the target, which was at 100 yards. I use an Oehler 35P chronograph. ----- Conclusion so far, back off the 93 grains to 92 or 91 and after barrel breakin, then shoot for maximum accuracy with that bullet, then try others if necessary. Good luck with your project and good shooting.

You will be better off with the 7 stw.. Mine-loaded with Imr-7828--83 gr-140 gr bullet 26in wby accumark 3530-3550 av.fps is a good start, Layne Simpson Data. All the 7rum was alot of B.S. from remington. The 7stw was first and remington would not even load it to its full power when they started to load factory shells for it when it came out. There has been alot of people pissed off cause of the rebated beltless rimed cases getting stuck in the chamber after firing and some not being able to extract the cases or jamming, 2 of my friends with rem- senderos, besides being way over bored, was more than the 7stw. And add 2 that the 300 ultra has the same problem Too put it all togeather the body of the case'7rem ultra and 300 rem ultra is fatter than the rim which is the same size as the rims on standard belted cases, this allows it to work with standard bolt faces at the price of potentially reduced feeding reliability. This is beacuse with rebated rims there is less rim area for the bolt to catch as it tries to push or pull cartridges from the magazine and in to the chamber. Failure to feed could be Fatal and should be confined to moose-elk ect- No DANGEROUS GAME. Beleive it or not

[ 08-20-2003, 06:46: Message edited by: 4bambam ]

Anyone talking of loading the STW to it's "full power" shouldn't have any roblems with overbore!
Besides, you want that bullet to go really, really fast? You're going to have to make some compromises. Where YOU decide the line is doesn't make anything beyond it BS.
I'm comfortable using the term "overbore" in regard to the 7mm Rem Mag. And yet my next wildcat project will be a .277 with more case capacity than the 7RM.
I haven't heard "alot of people pissed off cause of the rebated beltless rimed cases getting stuck in the chamber after firing and not being able to extract the case". Seems like it would be all over the press, especially on the net, if this were true, to counter all the marketing hype.

As for the original question, there's no way that much capacity would be worth the recoil, to me.
I'm not trying to win 1000yd matches with a 7mm, and

say the Rem Mag sends a 150gr at around 3100 fps, the STW does 3250 and the RUM does 3450 fps.
If this is the Barnes XBT, BC of .529 then we have these external ballistics:
Rem 3200 ft/lb ME, 1728 ft/lb @ 500 yds, -34.63"
STW 3518 ft/lb ME, 1920 ft/lb @ 500 yds, -31.21"
RUM 3964 ft/lb ME, 2191 ft/lb @ 500 yds, -26.67"

Now, recoil-wise, these three rounds, in an 8.5# gun, produce the following recoil levels, stated in ft/lbs and fps:
24/14, 28/15, 36/17

Just for fun, the 280 Rem, doing 2900 fps gives us these numbers: 2801, 1485, -39.44"
And recoil is 20/13.

So... you really just have to decide what if anything all this means to you.
If you don't mind long tubes, going 28" might get you another 50-70 fps on these numbers.

BigBore, what do you plan on doing with the rifle?

[ 08-19-2003, 12:11: Message edited by: Bwana-be ]

No one brought up the 7MM Dakota, but I think it is a bit more efficient than either the STW or RUM. I get 3250fps w/ the 160grNP & 72.5gr RL22 or 73.5gr IMR7828. This is from a 26"bbl. The brass is a bit more expensive, but 500rds should last you a lifetime of hunting. I'm on my 7th reloading w/o any signs of rejecting any cases. You can spend the money for a Dakota or rebarrel your existing 7mag since it fits in a "standard" length action.

Fred, youre full of BS saying the dakota is better than the stw or more efficent, all's youre dakota is a 7mm Wby- with dammn- expensive brass. ,Should prove my point I guess 7 wby-160gr. -73.5 Imr 7828 Or if you want the data from Imr I'll send it to you...

[ 08-20-2003, 05:52: Message edited by: 4bambam ]

Bwana-be-Your ballistics for the 7mmstw are pathetically mild.My two 7mmstw's deliver 3500fps with 140 gr bullets and 3400fps with 150gr bullets or all of 50 fps less than both your numbers and the numbers from my own 7mm ultramag.

Stubble== I just added above his post on my old one, my wby accumark 7stw 83 gr imr-7828-140 gr bullet-3530-3550av.fps. Plus more info on the 7 Ultra mag

[ 08-20-2003, 06:48: Message edited by: 4bambam ]

4bambam-I have seen in excess of 3550fps out of my stw's but in hot weather I did see more primer pocket expansion than desireable.I use 80gr of 7828 for 3500fps(at 70 degrees) and case life is very good with accuracy averaging 1/2".

I shoot both the 7RUM and 7STW. The RUM definitely seems to have more recoil, but it is in a lighter rifle. I enjoy shooting them both, but the STW is my favorite. I don't think you could go wrong with either one.

4bam, you sound a bit sensative, I didn't say your truck was ugly or anything. I think the Dakota offers alot of perf. in an efficient package, never said it was better. You like loading data:
7mm wby-73gr IMR7828/160grNP = 3040fps/24"bbl
7STW - 75gr IMR7828/160grNp = 3123fps/26"bbl.
These are from the Nosler#5. We all know about book numbers. I see most of the guys better their STWs by quite a bit.
I've been able to get 3300fps+ from the 160grNP/74grIMR7828. I have also pushed the 145grGS to 3450fps/75.5grIMR7828. A few grains less powder & 75fps behind the STW isn't better, isn't BS but it is efficient.
Oh yeh, I went to the IMR site;
STW 76grIMR7828 / 160gr = 3110fps
7mmwby 73.5gr / 160gr = 3210fps (w/ 10k less pressure)If you go by that data then the Wby. is "better".
I guess I fail to see the point or relationship to one source book data. Everyones rifles are different. One thing is for sure, you can't put a STW or RUM into a std. length action. Just another view point not condemnation of the STW, which is a very good round. I also think the RUM is alot of gas for not much more go.

[ 08-20-2003, 19:26: Message edited by: fredj338 ]

Hi,
How many of you use the Lazzeroni 7mm? From my experience it is the fastest big7 and can be had in a Sako...
Also, would it be possible for a 7rem mag action to be reamed out to 7Dakota/Weatherby by a gunsmith??

Yes Bog, a gunsmith can rechamber your 7mag. It will require the bbl. be set back as the Dakota shoulder is a bit shorter than the REM.MAG. My Dakota is a rechambered Ruger #1. I could have gone w/ the STW but I think the Dakota is very accurate (no belted case) & efficient. If you don't mind paying more for the brass, then why not.

Yes a sako at $900. Burned out a barrel at 650rds-to were it was almost 2 1/4in groups at 100yds The 721(284) fire bird is the fastest 7mm,a 140 gr bullet 3721 fps,160gr at 3550fps--$40.00 for 20 brass. Or pay $29.00 for 20 rds of dakota brass. When if rechambering to 7stw or 7wby brass is $32.00 to $35.00 a 100. and usually $100-135 to have a gun smith do it here where I live, and go to the stw and it will take out some of the throat erosion off the old 7mag
Imr7828-97gr for 140gr bullet-3721fps-fire bird
'''''''-83gr for 140gr bullet-3550fps-7stw
'''''''-76.5grfor140gr bullet-3390fps-7wby
'''''''-79gr for 140gr bullet-3400fps-7dakota

[ 08-22-2003, 07:16: Message edited by: 4bambam ]

I bought my 7mm Ultra Mag Sendero last year BECAUSE I had heard such boogie man stories about how difficult it was to load for and how bad it was on barrels and how it was just plain difficult to get one to shoot accurately. So far none of that has proven true. I can drive a 150 grain bullet at an honest 3400 with no problems at all. A 160 goes 3300. Brass lasts well and accuracy from my Sendero is extraordinary. I don't really know how long the barrel will last and don't really care. When and if it goes I will simply rebarrel and continue. My buddy shoots an STW that is just as fast and accurate for all practical purposes. Either caliber will do everything a 7mm needs to do.