Well, I now have 66 rounds through the CZ .458 Lott. While paying attention to the stock, I noticed a bit of chipping started by the 14th round. Thought this may be a problem due to the tight inletting around the tang. Stopped shooting and went home. Added some agraglass and after it set up got out the dremel with a sanding drum and relieved the inlet at the rear radius of the tang, about a 1/16 of an inch. Just pulled the barreled action to check the stock and so far no problems. Shooting the Lott is a whole lot more fun offhand than off a bench. Will settle on a practice load of Barnes 500gr flat nosed banded solid, Hornady brass, Winchester primer and 77.0grs Accurate 2520. Goes 2150fps and shoots into a big hole benched @ 50yards. I am using the open express rear with a NECG's 3/32" front bead. I believe I will mill clearence on the front sight ramp for their 3/32" bead/flip up 11/64" close quarters front sight. The Brockman stock may not have any problem with .375 H&H or .416 Rigby but, it needs to be relieved at the rear of the tang for the .458 Lott. So far it seems to be holding up well.