Years ago when I first got into cap and ball revolvers and conversions (gosh, it's been 5 years since I got the 1858), I had never really thought about doing a conversion for the .36 calibers because of the .375 bore. Times have changed and what's different now vs then is I reload. I have my Pietta 1851 Navy in .36 that I got for the low, low price of $80 at Cabelas years ago and I've shot it once or twice. I don't have much interest in shooting it as a percussion gun, it's a PITA to load with conicals and round balls are puny. I figure since I have .38, I can reload ammo for this, whether it's .38 Long or .38 Special and use hollow base bullets. So, my question for all here is: How accurate are hollow base bullets with the .375" bores? Is it worth considering buying a rusted out spare barrel and having it lined? Are there any conversion cylinders for .38 Special or are they all .38 Long Colt?