Hello folks, I'm kinda new to this forum and medium bore rifles. I have a 1971 Browning BAR in 338 win mag, scoped with a solid 3-9 Leupold. I am having trouble with consistent groups. For example, I've shot a one inch group with the 225 grain corelokts, but then subsequent shots are all over the place. Is this a barrel cooling issue or what? Does anyone else shoot an older BAR in 338 wm and what factory ammo do you guys like? I tried handloading for it, but ran into too many issues with the semi-autos and brass sizing. I am trying to get this gun to shoot 1 inch@100, don't expect anything better from factory ammo, but more importantly, I want consistency. Any ideas?