Glad for your last post. My 1903 carbine would only shoot 160gr bullets pointy end first. Anything lighter went sideways within 50 yards. All standard .264"bullets. Whilst musing over this phenomenon, I read in an early NRA reloader's handbook that M/S barrels were .268. So, I bought some .268" Hornadys and dropped my load 10% to start, and cut groups sizes in half at 100 yards. My carbine also has a "generous"chamber and "generous" headspace. I've been told by other 1903 shooters that this is common, especially in early guns. I custom fit the cases to eliminate all headspace, and try to minimally size the cases when reloading. It's fiddly, but the great little rifle is worth the effort.

Otto