You should not have any problems on normal usage. It is when higher/heavier loads (live rounds) when the stretching occurs. One indication that your using too much powder is when the back of the cylinder start to imprint itself in the back of the frame.. If you have one that is stretching some people use a washer at the back of the frame. I have been shooting BP revolvers since 1970, and own several brass frames. I have not a single one that has "stretched" that I purchased new. I have one that is 2nd hand that has. I own approximately 15 BP pistols I use them for live firing and blank firing(reenacting when appropriate). You don't need the big boom to get the job done, just use it under a normal load and any brass frame should last for years. My wifes' favorite brasser is a .44 cal 5" barrel. It was never made back in the day but it's a great shooter she bulls-eyed it the first time she shot it. A colt knockoff brass frame runs in price from $150-250 in price(new). And you can pick up one at Cabela's. I am currently looking to buy a Grisswald & Gunnison brass frame pistol. This would complete my trio of repros of Confederate made pistols.
In effect go ahead and shoot it and have fun. I DO![/QUOTE
My wife loves to shoot my 1851 reproduction and I do as well. Its a very accurate pistol even compared to modern day polymer pistols. We will typically shoot between 30-40 rounds when we get it out. I love the look of the 1858 Remington and have seen them both in brass and steel frame models. The Remington reproduction will be my next purchase, either in .44 or .36 caliber. I had never talked to anyone that had shot a brass frame one. I read different information about the reliability and that goes from one end of the spectrum to the other. I know that with 20 gr of powder that the recoil is very low and accuracy is very good with my 1851.