about 35grs. of RL7.
I even tried paper patching 45acp 230 grain unsized cast bullets, but that didn't work out too well, they didn't obdurate and they tumbled. a lot of gas came back over the cartridge case. Had it been a bolt action or lever gun, I would have found out how those gas escape, protect your face, channels work. With the falling block, there's no where else for the gas to go but down the barrel.
I guess I'm getting a little recoil shy in my old age. (Recently, and regretfully sold my CZ 550 in .416 Rigby, now that was a kicker). If the shop I sold in to still has it in June, I may buy it back. At $130.00 a box of 20 for Federal ammo, you HAVE to reload that sucker.
In my Marlin, it doesn't bother me at all ans shoot faster loads.
The Ruger has a paper thin barrel and it is very lightweight. I even put and old 3X9 scope on it to increase the weight, but it's not enough. I guess the stock is just poorly designed. On the other hand, my #3 in .223rem. is a joy to shoot all day, barrel diameter is the same but the hole is a lot smaller, so it is effectively like a heavy barreled varmint rifle, and is a pain to lug around the field. Great for sitting in one spot and calling in coyotes and bobcats with though.
I'm in the muddle east right now, but lining up this project for my leave in June, as they say here, In- sha-allah, (G-d willing).