velocette
Member
For my .308 AR rifle. 18" bull barrel. My primary load is 41 gr of IMR 4895 behind a Sierra 168 gr HPBT match bullet in Federal brass. Excellent accuracy, sub moa. (Just below the Sierra manual's max of 41.3) All loads seated to magazine length of 2.8"
Chronographed at 2450 fps by a fellow shooter at my local range.
Now many months later, I do not have a chronograph available & am curious about using brass of larger powder capacity. The Fed case is the heaviest .308 brass (182 gr. average) with the least internal capacity.
If I were to use a case with larger internal capacity such as a Winchester or Hornady (160 grain average) and use the Hornady reloading manual's charge data for a 168 grain bullet which is 2 grains higher for max, is it reasonable to expect a 50 ~ 100 fps increase in velocity? Or would the larger case dimension obviate the difference? Obviously, all loads to be worked up to being observant of pressure signs.
Roger
Chronographed at 2450 fps by a fellow shooter at my local range.
Now many months later, I do not have a chronograph available & am curious about using brass of larger powder capacity. The Fed case is the heaviest .308 brass (182 gr. average) with the least internal capacity.
If I were to use a case with larger internal capacity such as a Winchester or Hornady (160 grain average) and use the Hornady reloading manual's charge data for a 168 grain bullet which is 2 grains higher for max, is it reasonable to expect a 50 ~ 100 fps increase in velocity? Or would the larger case dimension obviate the difference? Obviously, all loads to be worked up to being observant of pressure signs.
Roger
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