I recently picked up the S&W M&P 15 "AR" in .22 LR. I have some CCI and Winchester high velocity rounds that work well in friends' guns. Do you have any additional suggestions? I also have a few boxes of Remington Gold ammo that works nicely in my Marlin 60 and my Ruger Single Six, but I'm a little leery about trying it in the M&P. Thoughts? Thanks.