Unfortunately Pete04 has a point. Scores of original Colt SAAs especially .41's have been pulled apart and reassembled as .38 Specials, .44 Specials, and .45 ACPs. It makes me quite angry. Admittedly, I was one of the clueless when I entered antiques, though thank goodness I never altered one. Have only owned originals and continue to and only in the last couple years have I come to realise how important this is, especially with information I learned of 18 months ago. We're not only pulling apart history we're piece by piece pulling apart one of the few sensible exemptions we enjoy in this hobby.
Never alter your antique to a non-antique, and even non-original chambering, and don't buy an altered gun either. The scary part is there is no way the RCMP will hire a board of antique experts to determine if a gun is original, and many manufacturers kept poor records (aside from Colt, and the obvious like models only offered in one chambering in the antique period), so the legislation will likely be blanketing. A few ruining it for many, they gave an inch we took a mile and we're almost certainly going to suffer for it. Painfully ignorant of us. I can only hope they stop at non-Pre 1898 chamberings.