have at it. I assume you have seen the converting to a 308 thread? there a lot of good info. Id recomend reloading and keeping the pressures down 243 max loads might be pushing it. now one has blown one up yet but you donet want to be the first its a pretty tight fit to get a G3 mag to work it will not fit into a m70 trunion as Is. Are you planing to trim the mag were the lower trunion rivots are? Im interested in what you do for a Mag latch.
Im going to be doing a 260 rem on a 308 sagia 3 lug bolt and trunion. it will be free floating barrel much like my other varmit builds. it will shoot full power loads. I toyed with 243 or even a 22-250 on a standard trunion I would be keeping the pressures down however.