The Firing Line Forums - View Single Post - 338-300 Win Mag

Jimro · July 13, 2014, 11:48 AM

If you can really get an extra 10 gr of capacity it might be worth it from a ballistics standpoint. These are just "back of the napkin" guestimates, so use anything here at your own risk, I make no claims for safety or performance.

A 338 Win Mag with a max charge of IMR4350 listed by Hodgdon nets 2,420 fps at 64gr compressed. That works out to 37.4 fps/gr.

The 338 Win Mag has 86gr case capacity. 64gr IMR4350/86gr H2O = 74% fill rate. An additional 10gr of H2O capacity for you wildcat times 74% gives 7.4gr more IMR4350 to compressed. So an additional 7.4gr of powder would be 71.4gr, 71.4gr times 37.4 fps/gr = 2,670fps max charge with IMR4350, from a 24" barrel.

Food for thought anyways.

Jimro

July 13, 2014, 11:48 AM	#16
Jimro Senior Member Join Date: October 18, 2006 Posts: 7,097	If you can really get an extra 10 gr of capacity it might be worth it from a ballistics standpoint. These are just "back of the napkin" guestimates, so use anything here at your own risk, I make no claims for safety or performance. A 338 Win Mag with a max charge of IMR4350 listed by Hodgdon nets 2,420 fps at 64gr compressed. That works out to 37.4 fps/gr. The 338 Win Mag has 86gr case capacity. 64gr IMR4350/86gr H2O = 74% fill rate. An additional 10gr of H2O capacity for you wildcat times 74% gives 7.4gr more IMR4350 to compressed. So an additional 7.4gr of powder would be 71.4gr, 71.4gr times 37.4 fps/gr = 2,670fps max charge with IMR4350, from a 24" barrel. Food for thought anyways. Jimro __________________ Machine guns are awesome until you have to carry one.