I went shooting again yesterday to take advantage of the cooler weather. I got a few Harvester sabots in the mail and wanted to try them. The first thing I noticed is that the 250gr Hornady with the Red Crush Rib Sabots loaded extremely tight. So much so I didn't think I would be able to get them all the way down the barrel. The second thing I noticed is that even though I increased the powder charge, a full grain on all bullet weights from my last trip, velocity remained unchanged. By the time I shot my last group I was starting to get a little discouraged and I could barely feel a little warmth on my barrel. The next two shots were touching and the third opened the group up to 1.26". For my purposes this would be completely satisfactory. The next thing is to see if I can repeat it or was it simply a fluke. I moved my scope down a couple inched for the final group because the others were hunting high. I guess I should have left it alone!
The 250gr loads did 2010fps and the 300gr load went 1910fps.