I'll have to get some ammo through it and get back to you on that. I would imagine with the leather being as heavy as it is (7-9oz) it will probably hold up just fine. In .30-30 it'll be pretty expensive to get the rifle that hot, I imagine your Henry is probably a pistol caliber carbine. I still have to figure out whether or not I can make that forend cuff adjustable and what the price will be with and without the sling. I'll post an update once I figure that stuff out.
-Infidel