pohill had made 2 posts referencing the reason why Sam Colt beveled the chamber mouths.
Colt's intent for the beveling was to prevent chain fires by deflecting gases away from the other loaded chambers.
"If you want to go back in time a little, Sam Colt explains why he beveled the chamber mouths - to prevent chainfires (I can post a larger copy)."--->>>
https://www.thehighroad.org/index.p...-cylinder-bores-bevel-or.520784/#post-6465489
"Don't forget that Colt designed the mouths of the chambers with a bevel to deflect gases away from the adjacent chambers (to prevent chainfire). Just keep that in mind when measuring chambers - some might be authentically beveled." --->>>
https://www.thehighroad.org/index.php?threads/inexpensive-lube-for-revolvers.204815/#post-2508207
pohill's photo disappeared from the THR database but I may have found what he had posted in a copy of Colt's patent letter for the Paterson revolver and revolving rifle.
"Figure 1 in the accompanying drawings represents a section through the lock and breech of my rifle or gun and two of the chambers of the revolving receiver, B being a part of the barrel of the gun. The mouths of the chambers and the end of the barrel have their edges chamfered or beveled, as shown at
a a in the drawings. In all guns of this description there is necessarily a lateral discharge between the receiver and the barrel, and this lateral discharge may endanger the ignition of the powder in the loaded chambers not in contact with the barrel; but the ignited matter, by coming into contact with the beveled edge as it crosses said chamber, is effectually reflected off, and does not enter them. The beveling of the end of the barrel is not a thing of importance, it being intended merely to prevent its scraping or cutting the ball in its passage from the chamber." --->>> SEE PAGE 1 ONE
https://www.gutenberg.org/files/49532/49532-h/49532-h.htm
Colt's reasoning doesn't mean that chamber beveling won't help accuracy, but it wasn't his intent.
