Quote Originally Posted by gtpkeeper View Post
the two bands that stick out on the slug measure .318
it fired the ppu .311 fmj ok,
My friends rifle shoots the .311" copper jacketed bullet alright, but lead is not accurate with the standard size bullet which is why he had a mould made with a bigger diameter bullet. The SMLE he has got had been rebarrelled at some point and the rifling is square. The gun had been in storage somewhere and was packed in grease which had to be cleaned off.
Because of the age of the rifle he only shoots lead bullets to preserve the barrel life and downloads the cartridges.

If I remember correctly a gas check is needed on lead bulets for velocities over 1200fps otherwise the bullet will strip the rifling. (Ride over it).