Ace all I know is I have barrels from 20 to 28 inches and several of the shorter ones were the best shooting. The 223 under the pic on the left of this post is a 20 inch McGowen and is one of the most tolerant of loads I have ever owned. I have a target of 10 rounds at 100 yds. n .173 center to center with 2 different bullets and powders.
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