7mm Rem. Mag. versus .270 Win.

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7mm Rem mag
7mm Rem mag

Q: I am having a rifle built on a Zastava M70 action in 7mm Remington Magnum. I have a Boyd laminate stock and figure the rifle will hold its zero in all weather conditions. For handiness I am thinking about having a 500mm barrel, but how much would the rifle lose in regard to velocity and trajectory? Would the 7mm Rem. Mag. still be ballistically superior to the .270 Win?

Peter Owens

.270 Winchester
.270 Winchester

A: While the exact amount of velocity you'd lose by having the shorter barrel length will vary depending on the particular load, bore tolerance, etc, you can figure on a reduction of somewhere between 180 to 200 fps with the 7mm Rem. Mag. fired from a 500mm rather than a 600mm barrel. This is roughly comparable to the amount of loss you'd get by shortening the barrel of a .270 by the same amount. If you fired 130gn and 150gn bullets in the .270 in a 600mm barrel and 140gn and 150gn in the 7mm Rem.Mag. in a 500m barrel, I doubt there would be enough difference to notice between the two calibres. The criterion of what any 7mm Magnum will do is with a 160gn bullet at 3100 fps, so I'd advise you to get a 600mm barrel.

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