308 smk 190 n140

[UNIQUE ALPINE]

Hi
Can one tell what a 308 load with a SMK 190 bullet loaded with N140 powder 42.5g will give me in fps i don't have access to a chronograph
Will be using a 27'' barrel with a 1/10 twist

Thanks
Andy

 

[Bart B]

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Products - Lapua

It looks like your bullets will leave someplace around 2500 fps. Depending on the specific barrel, powder and primer lot as well as case neck tension, it could be up to 100 fps faster...or slower.