I'm getting ready to start my next AR build. I've decided to build a long range 6.5 grendel AR. The only thing I can not decide is if I want to go with a 20" or 24" stainless bull barrel. I know the 24" will give me alittle more velocity but will I get any more accuracy out of it? Or are there any other pros/cons of going with a 24" over a 20"?