If by best ballistics you mean drop and wind deflection, there are others that are better on paper. 28 nosler is one. If one wants a 7 mag, It's the best balanced one out there IMO though.
If a man already has a 7MM mag, you probably don’t upgrade to 7mm PRC. But, the PRC does edge out the Mag. Higher chamber pressures and tighter twist rate (1:8 vs 1:9-1:10) allows for heavier loads. The Mag was designed to shoot 140-160gr rounds, while the PRC is designed specifically for 175-190 at almost equal muzzle velocities.
There are better wind drift and drop calibers on paper for sure… but when you balance drop, drift, overall velocity, velocity retention over distance (better bullet expansion at distance), longer projectile options allowing higher BC, higher energy on target, and recoil… the 7mm PRC performs better (in more categories overall) than basically anything.
Perhaps if a 7mm Mag was re-barreled with a 1:8 twist rate it would be a MUCH closer comparison, but then you run into issues with factory Mag ammo being designed for a 1:9.5 not matching your 1:8. If someone custom loads, you could definitely work up loads for a Rem Mag that would close the gap between the two factory load options. But the same custom loader could push the PRC further as well.
In reality, the 7mm Rem Mag is absolutely effective on all North American big game at normal hunting distances. But, if starting from scratch… the PRC combines EVEN better performance at those ranges, excellent performance at even longer ranges, AND competitive performance in long range precision shooting.
I personally think it is the current do-all caliber on the market. To the point that I could see myself with only 2 calibers…
*308 Win as my “what if” gun for bulk ammo availability.
*7mm PRC for all hunting and long distance shooting.
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