Re: AR15 1:10 best reload
No surprise there, since a 1x10" is actually the ideal twist for a 69 SMK. Also, don't forget that if you've got a buttoned barrel the twist may vary 1/2" or so in either direction from the stated twist. If you happen to get one that runs a bit faster than what it's listed as, it'll handle bullets that it supposedly shouldn't. If it goes the other way (slower) it may not be able to stabilize bullets it "should". if it's handling the 69s well, run 'em!