I’m reloading some blazer brass from a case I bought, I also have some brand new Remington cases. I have about 500 pieces of range pick ups as well. This will be my first time reloading 45acp and right now so far I have 3 test loads I’m waiting to try. I’m using CFE Pistol, 6.0gr, 6.5gr, and 7.0gr with 230gr TMJ Speer bullets. Shooting out of a Glock 21 barrel is 4.61”.
Here's my load for 45 using X-Treme Bullets 230 grain (plated) Round Nose
CFE Pistol: 6.0 grains (805 fps) to 6.1 grains (818 fps)
COAL: 1.260" with a light crimp
Velocities are from a HK USP 45 full size
just my opinion, but 7.0 grains might be kind of stout and might exceed safe pressures for your Glock 21