Rifle DATA
NEVER Exceed the Loads Listed Here

7MM WINCHESTER SHORT MAGNUM CASE: WINCHESTER
BBL: 24" PR: WINCHESTER LRM
TWIST: 1:9.5" TRIM: 2.096

162 GR. HDY BTSP (Maximum Loads)
DIA. . . .284"
COL: 2.860"

RETUMBO
70.5C
3007
62,500 PSI

H1000
69.0C
2969
63,400 PSI

H4831
62.0
2915
62,800 PSI

H4350
58.0
2909
62,900 PSI

H414
57.5
2892
63,200 PSI

H380
56.0
2824
63,200 PSI

VARGET
51.5
2830
62,900 PSI

H4895
49.0
2773
62,700 PSI
Rifle DATA
NEVER Exceed the Loads Listed Here

7MM REMINGTON MAGNUM CASE: WINCHESTER
BBL: 24" PR: WINCHESTER LR

162 GR. HDY SPBT COL: 3.290"
H870 80.0 2883 43,300 CUP
H1000 70.0 2905 49,600 CUP
H4831 64.0 2871 49,800 CUP
H4350 58.0 2799 49,400 CUP

This data was taken from the Hodgdon powder website() http://www.hodgdon.com/data/rifle/7mmwinshortmag.php#top . The 7mm WSM is listed in psi units while the 7mm Remington Magnum is listed in c u p units. If possible can someone PLEASE convert these figures to the same unit of measure (i.e. psi to cup or cup to psi)?

I think it would be interesting to see if the two rounds are being loaded to the same level or is the industry underloading the Remington case and loading the WSM case to the hilt for marketing purposes.

Please pay close attention to the H1000 loads. Sixty-nine (69) grains of H1000 is listed as the compressed maximum for the WSM while 70.0 grains of H1000 is listed as the maximum for the 7 mm Remington. I would bet that once the pressure measurements are equated the Remington is underloaded.

What do you think?

Good Shooting,
HBB

[ 01-02-2003, 03:12: Message edited by: hillbillybear ]

My internal "Calculoader" program shows 66600 psi = 51500 cup.

This program uses 54000 cup as maximum for the 7MM WSM.

The same program holds the 7MM Rem Mag to 52000 cup.

I hope to get back to this topic later.

[ 01-02-2003, 04:39: Message edited by: Savage99 ]

I've read that it's impossible to convert CUP to PSI, but I don't know.

What I do know is that the 7mm Rem mag in my 24" 700 ADL did over the chrony:

Federal Premium 160 Nosler @ 3090 fps (factory)
Remington PSP 140 @ 3225 fps (factory)
Nosler 175 partition handloaded @ 2930 fps

My handloads, from Sierra, Speer and Nosler, have all done great, over published factory velocity, with excellent accuracy. I'm not against the new beltless short mags, but a reality check shows that as yet they haven't topped the old standards for velocity. They do look like a great way to pack a lot of punch in a short action and get some great accuracy. Regards, Guy

hillbillybear...I don't sense any effort to confuse and confound. I've read most of what has been published about the short-magnums and except for a very few instances I don't remember anyone saying these short-magnums would exceed the performance of the magnums we've all grown to love. What they did say in most cases was the differences in performance would be small enough not to make a difference...some have gotten carried away with perceived reduction in recoil but that is so dependent on the shooter and the design of the stock that I've discounted the reports.

The browning and winchester adds specifically say that the 7mmwsm velocities exceed the 7mmremmag velocities,the 270wsm velocities exceed the 270wby velocities and the 300wsm velocities exceed the 300win mag velocities.Some people actually believe this although it has been proven that the adds are out and out lies and deception.

Any one who has a good chronograph knows that factory ballistic tables are crap. The easily affordable access to chronographs has also gone a long way to help sound the death-knell of such "super" wildcats as the various Gibbs and others. It's no longer possible to "estimate' velocity and get away with it.

I think the WSMs are some of the best cartridges to come along in many years--especially the 300 WSM. IMHO, the 300 WSM is and will become a great cartridge for North America. I rate its stature right along with three of my favorites--the 270 WCF, 30-06 Springfield and 338 WM.

Truthfully, the WSMs do lag behind the traditional, 30-06-legnth short magnums by about 40 or 50 fps. Losing 40 fps (or for that matter 150 fps) in this type of cartridge really doesn't concern me.

Overall, I think they're accurate, usable cartridges that kick about the same as traditional magnums. My biggest complaint was having to deal with poor Winchester customer service when my gun was delivered with problems. And contrary to popular belief, they don't necessarily feed poorly. My gun was as slick-feeding as any rifle I've ever owned.