I have a mini-30 which was manufactured and shipped June 1991. Ruger tells me it should have a .311 bore and a 1:7 twist rate. The measured twist rate on my barrel is 1:10. There's a page on Brownell's that indicates the early rifles were .308 bore with a long throat and some .308 barrels were used through '92-'93. Can anyone here verify either correct twist rate for a that era .311 and .308 barrels??? I'm going to start reloading and using this as a 100 yd hog rifle. It is so light and handy that I think it would be an awesome rifle for that role in the 7.62x39 caliber. I have some very good .308 cavity back MKZ bullets to use. Any input appreciated on a load for these rifles as well.