I was reading a post about a guy who was having receiver problems with his mini-14 and he was using NATO spec. SS 109 62 grain ammo, a responder said it was too hotly loaded and the heavy bullet added trouble. I know that the early tests done with the M-1 Garand in 30-06 found that the heavy bullets were beating the rifle too hard and they went with the 150 gr. FMJ to prevent problems.
I have mostly used a bolt action .223 over the years, did not think of any problems with the heavy bullets, but with my fairly new Mini-14 in .223 I am worried about using 62, 69, 75, or even heavier bullets in it for wear issues? I also might get an AR-15 down the road. Should I stick with the 55 grainers in semi-autos and the heavy bullets in my bolt gun, or are the 62-69 grs. ok for limited use in a Mini or AR?
Thanks.