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7 WSM or 7RM

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Old 03-31-2008, 02:57 PM
Silver Member
Join Date: Oct 2006
Location: Norman, Ok
Posts: 187
7 WSM or 7RM

Ok folks I've been beating this dang thing around for a long time and I have gotten many different reports! imagine that huh? What I am looking to do is put the hurt on a steel plate at 1760 yards! simple not going to be hunting with the rifle if so it might be some of these little Okie deer and I'm sure a p-dog, I have been told everything from 50BMG, 338 Edge (I still want this one!) and a 7WSM my thing is crunching the data it looks like the 7WSM will go subsonic before it gets to 1760 with a 180 Berger so what would be wrong with just going with a 7RM? looks like it should stay supersonic well past the 1760. I ask you guys cause there are a few of ya that know what would work out so I'm asking what you think?

This will be on a Savage action so I'll have the Edge but not right now, need to have easy access to brass, does not take a pound of powder, something the everyday Joe can afford to shoot if that makes sense? Later,

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Old 03-31-2008, 03:34 PM
Platinum Member
Join Date: Mar 2007
Location: MN
Posts: 1,219
I'm no expert on either cartidge, but I did some searching on hodgon's site and it seems both the rem mag and the wsm have very similar performances and neither would have the advantage. BUT, the WSM in a short action would have a major disadvantage because you would be forced to use up much case capacity. However, I think you would also be seating the rem mag fairly deep too. Just on basis of theory, I'd look into doing a WSM on a long action designed to seat far far out of the case with the 180's. According to the reloading info, You should be able to get close to if not past 2800 fps and JBM calc says it will stay supersonic to just past 1 mile with a VLD berger 180.
I used to re-load but now I "hand-load".
-- Well, at least I try --
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Old 03-31-2008, 04:42 PM
Silver Member
Join Date: Aug 2006
Posts: 125
Here is my take....FWIW
First of all Do you mean the 7 RUM?
The RM is going to give you the same (basically) performance as the WSM. The RM will not be supersonic any longer than the WSM.

Go WSM with short action. If this is a custom job, you can get a box that will allow you seat the bullets out as far as you need with the 175ís and you may have to shoot single shot with the 180 Berger. Not a big deal when youíre shooting steel.
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Old 03-31-2008, 05:12 PM
Silver Member
Join Date: Oct 2006
Location: Norman, Ok
Posts: 187
Yes Remington Mag, this is going to be done on a long action! I did my 243 on a long action and with the 105's it helps get a bit more powder in the case as we set it up for the 105's set out there long. I'm going with a long action Savage action so I can swap out the barrel when I get used to shooting at those ranges I'll swap out the barrel for an Edge more than likely. Later,

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Old 03-31-2008, 05:56 PM
Silver Member
Join Date: Feb 2008
Posts: 121
The useful case volume capacity

Is everything. If everything else is equal the useful case volume capacity will always win.

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Old 03-31-2008, 06:21 PM
Silver Member
Join Date: Jan 2008
Location: Everett, WA
Posts: 421
Yes "all else being equal" but, I believe the WSM's operate at higher case pressures. According to Sierra's reloading manual the RM should have a slight advantage with the heavy 7mm bullets.

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Old 03-31-2008, 07:12 PM
Platinum Member
Join Date: Jun 2001
Location: Potomac River
Posts: 5,057
The guy is shooting at a mile!!! For goodness sakes he ain't asking for a belt feed rifle. I simply can't fathom the need for a magazine. You can reload a single shot three times before the first bullet even lands.

A 240 Wby with a Berger 115 and two and a third dump trucks of RL22 in the case will make a mile. You would not want to be standing there when it landed.

A 257 Wby with a Wildcat 142 RBBT will smoke a mile and give you nine cents change.

What you need is a launch speed of about 3300 fps and a BC of 0.6 . If you go to a higher BC you can go to a lower launch speed. If you go to a larger bore diameter then you can prolong barrel life. Go play on JBM and find what gets you what you need with the least launch speed and largest diameter. Remember Richard Graves makes some great bullets.

Other option is to select a gunsmith who knows which end of the bullet needs to land first at a mile and ask him and have him build it. Both Kirby and Shawn knows. If you think that is a stupid comment then I can dig in the trash for a bullet my son found at the F-class match that had landed backend -forward.

I do not recommend either the 240 Wby or the 257 Wby to you for what you want as these are cartridges for killing animals at long range not shooting steel plates. I have my heat up the barrel paper shooting" rifle and then I have my "very carefully pampered hunting" rifles.

Hopefully, this has help you get a grip on the small caliber range and then you can work on the larger calibers.
The Smokin Fur Rifle Club
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