Thread: Loading IMR 4895 in 308

Originally Posted by mattstr

Cheers that showing quite different information what I’ve been looking at.Attachment 206575

Hodgdon data uses Winchester brass. In my experience has a larger internal capacity than most other brass meaning you'll need a higher charge weight to get the same pressure/velocity than brass with a smaller internal capacity. Hornady data uses Hornady brass which in my experience has on average a smaller internal capacity than Winchester, that's why the charge weights are higher on the Hodgdon data. Internal ballistics is a whole other topic do we should leave it there

Try and use at least the same brand of brass in your load development and final load, it'll save you many headaches.

Same advice as always, start low at the minimum charge weight and work up through the charge weights paying attention to pressure signs and you'll be fine.