Originally Posted by danf_fl
Is it a Series-80 Colt?
With the "collett" barrel bushing?
If so, the legs have been known to break. If one is broken or cracked, the barrel is not being held as it should.
In an earlier post it was stated to be a Springfield GI model. No collet bushing.
As previously mentioned.
Inspect the gun to make sure there is nothing amiss.
See where it's hitting on paper from a rest. Unless you are just that darned good, everything else is guesswork.
If all else fails, take it to a smith.