Finally got a chance to try some sabots in the 21" GM LRH barrel this morning. The range was muddy, so I put the target at 35 yards. I was loading 80 grs of fffg Goex for all shots.
Tried some 240 gr cheap shot sabots first and put the first two shots through the same hole at 35 yards. Then I tried #3, and pulled it to the right (knew it was out of the group as soon as I pulled the trigger). The first two were high left about 2".
Then I went to 300 gr XTPs and shot a good group, but slightly left. I made a small adjustment to the rear sight and switched to 360 gr .457 bullets in MMP orange sabots. Right on @ 35 yards. I then tried a shot at a small piece of white plastic stuck in the mud at the 100 yard backstop. When I touched the trigger the plastic disappeared!!!!
Pic shows the group to the left with 300 gr XTPs, then the group in the bullseye with the 360 gr .457s




The more I play with this barrel, the more I like it! It doesn't seem to be a bit picky about what I feed it. It looks like it might like heavy bullets which suits me fine. I'd much rather use heavy bullets for deer hunting. Looks like I need to break down and spend some $$$ for some Barnes Expanders to try in it.