I got a 1995 Glock 20 new.
All I have ever used it for is overload work ups in 10mm and 40sw.
I worked on how to get the most power:
1) Aftermarket barrel with case support up to or close to the case web.
2) Best powder is IMR-800X triple compressed, much less trouble is #2 is Power Pistol
3) Best bullets are 180 gr or 200 gr.
4) Barrels may need to be throated.
5) Loaded ammo may bulge with compressed powder and require resizing loaded ammo.
6) Do not use bullets squished in compressing powder. Loaded ammo must fall into chamber and not wedge bullet.
7) Build triple recoil spring assemblies to keep slide from hammering the frame and your hand.
8) Use two magazine springs in parallel to compensate for recoils spring speed.
9) Use higher trigger force [NYCPD trigger] to reset with faster slide.
10) Throat chamber to take fat bullets at maximum OAL that will feed.
11) Use small primer brass. If no 10mm brass is available, use 40sw brass and a 40sw barrel that is throated.
When I work up to brass failure, Longshot never gets high velocities like Power Pistol and 800X.
When I work up, not enough Blue Dot will fit in the case to get high velocities.
