I played around with it for a while, have lots of data for it using 800x, Longshot, Power Pistol and maybe a few others. I used a Gen4 Glock 21 then dropped in a KKM 4 port compensated barrel.
A little into it had the throat of the barrel extended a bit because I wanted to run .452" revolver style bullets that had more of a blunt nose and they would touch the rifling causing me to have to load them to a shorter OAL.
But from the nearly 5" KKM G21 Gen4 I've ran as light as a 185gr @ 1600+ fps on up to 300gr hardcast @ 1150fps and a loads in between. The comp is needed at those levels because at that point, it's basically a 460 Rowland. The 460 isn't longer overall, it just uses longer brass so it won't accidentally fire in an unsupported 45 ACP gun, otherwise you can load 45 Super to 460 specs, heck some guys used .45 ACP brass to get similar results, but I'm not that adventurous. I used new Starline .45 Super brass and the KKM barrel had excellent case support.
Ultimately the upper end stuff, I felt, was being a bit rough on the guns frame. I mean many of the loads ranged from 800 to 1000 ft-lbs with heavy bullets, which I don't think the Glock was ever really intended for. The heavy loads were fun to see what the .45 Super can do, but overall I think mid-range .45 Super makes the most sense. It's easier on the gun, on the shooter and better socially, like a 250gr Gold Dot @ 1100-1150 fps.
A little into it had the throat of the barrel extended a bit because I wanted to run .452" revolver style bullets that had more of a blunt nose and they would touch the rifling causing me to have to load them to a shorter OAL.
But from the nearly 5" KKM G21 Gen4 I've ran as light as a 185gr @ 1600+ fps on up to 300gr hardcast @ 1150fps and a loads in between. The comp is needed at those levels because at that point, it's basically a 460 Rowland. The 460 isn't longer overall, it just uses longer brass so it won't accidentally fire in an unsupported 45 ACP gun, otherwise you can load 45 Super to 460 specs, heck some guys used .45 ACP brass to get similar results, but I'm not that adventurous. I used new Starline .45 Super brass and the KKM barrel had excellent case support.
Ultimately the upper end stuff, I felt, was being a bit rough on the guns frame. I mean many of the loads ranged from 800 to 1000 ft-lbs with heavy bullets, which I don't think the Glock was ever really intended for. The heavy loads were fun to see what the .45 Super can do, but overall I think mid-range .45 Super makes the most sense. It's easier on the gun, on the shooter and better socially, like a 250gr Gold Dot @ 1100-1150 fps.
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