I trim my long colts to ACP length for plinking and load them with 160 or 150 grain projectiles​ with 4.2 of clays or Titegroup. This works to 20 or 30 yards and is reasonable for most shooters. I usually run around six to seven grains on the long colts.
If you want to shoot to 100 yards you need to man up and stuff them full power and shoot at least a 200 grain projectile. I haven't seen very good stability with short cases or light bullets. You can't really go too wild since it's not a Ruger though. Be careful.

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