John, I've used a 333 double with about 70-80 year old ammo - it was SP and Kynoch, dont remember or know the bullet weight- on sambar sized game.Broadside 70-80m, 1 shot and 1 dead animal. We could not recover the bullet, broke both shoulders.I was young and impressionable, then.And have been impressed, by the 333-since.
Cheers