Thread: 300 win mag or 7mm Rem mag

7mm Mag will do the business, less recoil than 300mag, factory ammo for both is around the same for both with 7mm being slightly cheaper. Reloading would be no difference in cost but 30 cal has larger range of projectiles however seating depths for heavier pills in 30 cal can be an issue. How much mess a bullet makes depends on the selected pill at a given distance.

The 7mm with a 150 grain bullet has a sectional density of .266, a .30 cal. with a 180 grain bullet has a sectional density of .271. The Ballistic coefficients are basically the same. In other words these bullets will penetrate about the same and have about the same trajectory if the same type of bullet is used and they start out with the same velocity. The .30 cal. is a bigger diameter and is heavier, which means it will have a little more punch. The 160 grain 7mm(sec. density .283) is even higher than the 180 .30 cal. which means that for a given bullet and velocity will out penetrate the 180 grain .30 cal. The .300 starts to pull away a little in terms of power when you step up to a 200 grain bullet. The 7mm Rem. Mag. with a good 160 grain bullet and the .300 Win. Mag. with a good 180 grain bullet can both be pushed to slightly more than 3000 fps and are so close in performance that I doubt anything you shoot with either will ever know the difference.