Ross, thank you for posting this! I find it intriguing that the 17.5 & 23gr group but not the 20gr! Here is my 17.5gr @ 20yds...two groups, one higher right then the lower left group as I adjusted the turrets. I've found that slugs groups stay the same at longer distances until they start to lose spin which is usually quite a bit past 100yds. These are both 5 shot groups.
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