Quote Originally Posted by Guns4545 View Post
I'm getting decent 4 shot groups right around 1" at 100 yards with 69gr Sierra match kings with OAL of 2.250. Do you think I would see a improvement going to say 2.255 or 2.260 (Mag length)? If it matters my barrel is a 16" ballistic advantage 223 wylde stainless steel Hanson barrel 1/8 twist. Life goal for me would be under a 1". Any tips would be great appreciated. Thanks folks.

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Honestly, I've struggled with these as well. Even had some keyhole on me. Couldn't get good groups no matter what I tried. This was out of a M&P with a 1:9 twist 16" barrel. It just prefers lighter grain bullets. I still have some of these Sierra's left. I'll load another test batch up at 2.260 and see if that improves anything...

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