Originally Posted by 3006savage
Several posts referenced the 7mm Rem as having a bigger capacity. The case capacities are actually equal. The 7mm Rem is 83.2 and 7WSM is 83 grains. If you reload I would choose the 7WSM for the following reasons.
1. Shorter case provided more efficiency with equal powder.
2. Shorter case provides more consistent velocity which at long range improves accuracy. This has been well documented in benchrest competition shooting.
3. Unbelted case headspaces more positively on the shoulder for better accuracy.
4. Shorter WSM case allows for lighter actioned rifles which in turn allows a lighter carrying gun or heavier barrel contour for reduced barrel whip.
5. The 7WSM ballistically outperforms the 7Rem Mag at all weight bullets.
For instance the Federal Cartridge 160 grain NP is listed at 3160FPS this is a pretty heavy round and it is 100+ FPS beyond any 7mm Rem Mag factory loads.
If you do not reload the 7mm Rem is the ticket due to availability.
I have both cartridges mentioned in custom tactical rifles. I load for both and they are ballistic twins in ALL regards. IMO, the 7WSM is a 7mmRM in a S/A. No more, no less.
Here is my take on Mr. 3006Savages comments.
1. In theory, yes. However, I have yet to see a REAL difference with a field rifle in field conditions.
2. Not the case, Im running single digit ESs in both my 7mmRMs and 7WSM. Proper case prep, and loading goes a LONG way in this dept. Both cartridges are splendid LR performers. I dont worry much about BR shooting, because I mainly do field shooting- no return to battery rests, super stable rests, no 30LB rifles, wind flags, etc.
3. Negative. Proper chambering, and die set up is critical for either- belted or non belted.
4. Cant really comment, other than a 1/2 pound heavier/lighter or inch longer/shorter, has never made much of a difference to me. To some people and for some applications it does. To each thier own.
5. BS. When loaded to the same pressures they basically run identical velocities.. What I have found is that when both cartridges are confined to thier respective action lenghts/mag confines, the 7mmRM will outrun the WSM with heavy long bullets- due to the long bullets encroaching on case cap of the WSM.
Dont put much stock in the factory ammo ballistics guide when regarding 7mmRM performace potential, simply because it is widely known that 7mmRM factory ammo is severly underloaded..