Last week, for the first time, I tried 44 cal 300 XTP's, using 90 RS and the short sabots with which they come. I was pleased with the 6 shot group results at 50 yards using the Hawken with open sights.

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Knowing the group would shoot low at 100, I used the long sabots to hopefully raise the 50 yard group. That didn't happen. Instead the group size swelled to 4 inches at 50 yds. and moved farther low right. I didn't bother bringing the target home.
So I went back to the short sabots, moved to the 100 yd target, and shot my first open sight MOA group of three! I wasn't about to shoot a 4th. I did try raising the powder charge to 100 grains which did raise POI but also spread the group. Seems 90 is the magic number.

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For my clean barrel shot, I tried a long sabot with the 260 Scorpion at the 100 yd target. Last week, this combo had put it right where I wanted at the 50.

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This time, at the 100, the clean bore shot was the right elevation, but 9" to the right of POA![:-] Off the paper!
Back to the drawing board.