Max bullet diameter for British .303?

[spinecracker]

Well, I tried it with the Hornady .312 bullets. At 100 yards, it was about the same group size as the Sierra .311 bullets, but at 200 yards it opened up a bit more (~3" versus ~2"). I think I'm going to stick with the Sierra Matchkings. My 91/30 will get fed the Hornady bullets lol.

Patrick, I was shooting from a sand bag rest, and the rifle has been scoped (Fulton's "no-gunsmithing" mount). The day was perfect, with no wind and no haze. Heck, I've shot that rifle at 100 yards with iron sights in a blizzard with surplus .303 ammo, and STILL got a 1 1/2" grouping.