If you are loading at the low end, your rifle may not cycle. Your barrel may not be benefiting your groups either. I could be wrong. But, a bolt gun and a semi are two different animals. I'm sure I'm not. I sold my 5.56 DCM and bought a 5.56 CIP chambered bolt gun. Night and day. Now using a semi 7.62x51 compared w/ a bolt is also something I have done. I was limited to Nato Spec 7.62, which was fine for 500 yards. My bolt gun at the same time can push that same ammo to 700 yards w/ the same accuracy. If I wanted to dump 20 rounds into a very small area at 500 yards, the auto is fine. If I want to shoot the buttons off a jacket at the same distance, no problem w/ a purpose built bolt. Your choice of firearm has more variables. BTW, I still want to build a FAL for distance.
Freedom is not free. The best of us always leave too soon.