I load 53,55,60,62,65,and 69gr bullets all sierra for my mini-14 and my del-ton ar with heavy barrel. Both have a 1:9 twist rate. I have used IMR-4895, W748, H335, and Tac powder, tons of different cases. Wolf, Remington, and CCI primers although I favor the CCI 400&450 primers.
My loads with 60gr varmiter bullets,W748 Powder are my mini-14's favorite load with my best group at 1.25'' which seems to be the best I can squeeze out of my mini and Im cool with that.
My del-ton on the other hand shoots almost everything very good with many of my loads coming in under an inch at 100yrds. The most accurate being 69gr sierra with CCI primers and Tac powder. Just over 3/4 inch.
I have done some work on the mini to get the accuracy Im getting now and Im happy with the results and I love my mini-14. I also love to reload and test different loads for my rifles.