I haven't used a chrony on the 223 so no clue at this stage , yes holes are completely round even the first lot at 24g charge ,usually shoots around an inch with ppu or better with Winchester ammo , I think il try upping the charge .5 I found some load data stating max charge for a 50g projectile 26.5g and maybe give it a bit more jump , iv heard good things about the ttsx so be good to get it working , im not %100 but I think the twist rate is 1:12 .
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