Lay in a stock of "standard velocity" ammo. Also today called "target ammo". The usual high speed /high velocity ammo today is not what the gun was built for.
Not saying it will damage your Colt, but it might, and even if it doesn't, its not good for it. It would be a shame to damage/batter that fine piece shooting the wrong ammo in it.
Why risk it?
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All else being equal (and it almost never is) bigger bullets tend to work better.
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