The 32 Long Colt was originally made with a heeled, outside lubricated bullet. The bullet was the same diameter as the case mouth (ALA .22 rimfire). The .32 S&W Long uses an inside lubricated bullet that is smaller than the case mouth. If your Colt cases are getting severly blown out it is probably because it is actually chambered for the S&W cartridge.
See a competent gunsmith and have a chamber casting made. This will allow him (I am making the presumption the gunsmith is male) to take measurements and determine the caliber of the gun.
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