Barrel heating affecting accuracy?
I shoot two different AR uppers in competition. The first one is a 20” Colt A1 “Pencil Barrel,” 1/12. The second one is a Bushmaster 20” Government profile barrel that my smith cut to 17”, 1/9. Both are lightweight barrels.
I don’t notice any stringing out of the barrels at long range when practicing. However, some shooters believe that even <20 rapid fire rounds will heat the barrel enough to adversely affect accuracy.
For example, Stage 11 at Ft. Benning had an array of 8-9 cardboard targets that were approximately 1-30 yards away, then 6 six-inch plates that ranged from 100-160 yards roughly.
IMO, the best way to shoot it was to shoot the paper offhand, standing, then drop to a knee and shoot the steel. I saw many shooters drop to a knee and shoot the steel first. When asked, each shooter stated that he wanted to shoot the longer-range steel first – before the barrel heated up.
Two questions:
1. What is your opinion?
2. If heating is an issue, will it more readily affect my two lightweight barrels?