I'm looking to get either an A3 McMillan or a Manners T4 for my .300 RUM (with a brake), and have asked several gunsmiths/knowledgable individuals, along with my own research. The results I hear from some is that these stocks don't hold up with the recoil or the magnums unless they have a heavy fill (which I'm trying to avoid excess weight). Therefore some people have recommended buying a stock like an HS or B&C because they have the aluminum recoil lug to take the abuse. My question would be, has anyone had a problem with a properly bedded McMillan stock breaking down due to the recoil of a magnum cartridge with a "sporter fill"? Also, how durable are the Manners stocks?