Ammo for M4 in Benelli Posted December 20, 2008 Thanks! Best bet is always to buy lots of different stuff, see what you and your gun like, see what patterns well and feeds well, and then go and buy more of that stuff. This is worth more than any guy on the internet telling you what to get. Agreed, but I thought I'd ask here first in case there's certain loads/brands that are known to give the M4 fits. I'd hate to buy boxes of stuff that's problematic.