I am building a Varmint AR in .223. I need to decide between a 20' and 24' barrel. I am a handloader and have done a lot of accuracy loading for bolt guns but never did anything with an AR. What considerations do you see about these two barrel lengths, considering I reload. I doubt that this rifle will see long range use as I have some .22-250's and 6mms that would be more up to that task. Your thoughts would be appreciated.