Max grain load for '58 Rem

I'm going to go against common wisdom here and state that the shaved lead ring, not the lube over the ball that prevents chain fires

That's a safe bet, since the common wisdom really is that a proper fitting ball, not grease, is chain fire prevention. Most people with more than 30 minutes experience understand that the best insurance against a chain fire is the proper size ball (the lead ring is the evidence that the ball fits properly) AND proper fitting caps. Both are needed, as the chain fire can occur from a leak of plasma at either end.
 
I've got a 58 Remington that shaves lead and will chain fire every time if you don't either use wads or over ball lube. You can load all six with 35 grs. and leave five nipples uncapped and it won't chain if the balls are lubed.
 
I'll suggest that the chambers in your '58 are not cylindrical, thus rendering the swaging at the chamber mouth ineffective. The shaved ring is evidence, but not proof, that the chamber is sealed by the ball. There can be imperfections in both the ball and the cylinder that will allow hot plasma to defeat the seal. Lube/grease/wads are effective insurance, but should not be relied upon as the only barrier in such rare cases. In my opinion, wads are the better of the two, but I've conducted no experiments to prove that. I believe that there are far more guns that are effectively sealed by the ball swaging than those that are not, such as your '58.

I'm sure you've seen the nighttime photos of revolvers being fired that clearly show the hot plasma surrounding both the front and back of the cylinders. It seems those photos should be evidence enough that chain fires CAN be initiated from the back of the cylinder.
 
I believe that there are far more guns that are effectively sealed by the ball swaging than those that are not, such as your '58.

Could be, not arguing the point it's 39 years old (I bought it new) but it's the most accurate bp revolver I have.

I'm sure you've seen the nighttime photos of revolvers being fired that clearly show the hot plasma surrounding both the front and back of the cylinders. It seems those photos should be evidence enough that chain fires CAN be initiated from the back of the cylinder.

I've seen some but find it hard to believe flame gets sucked down into the nipple. The Remington I have has #9 nipples and for many years all I could get was #11 caps. A very poor fit indeed. Even tightly pinched they frequently came off. Never had a chain fire originate from the nipple end. Not saying it can't happen but if there ever was a good candidate for it that Remmy is it. Like I said you can load all six and only cap one at a time and as long as the balls are lubed it won't chain. Leave the lube off and anywhere from three to six will go off every time.
 
Interesting thread. 'Specially as I routinely load my Remmie with 40 gr of Pyrodrek "P" with no ill effect. Even with that load it's accurate enough for my purposes and anyway I truly enjoy the flames and so forth, makes it interestin'. Don't want to fool around with packin' meal or double-wadding, which I would have to do if my loads were less robust; it makes me nervous to have the ball suspended over the wad, just hangin' in the air so to speak.

Don't use lube, just wads under a .457 ball and my caps are #10. And most of the time I use keepers on the caps, aquarium tubing cut into bands, because I am convinced that most chain fires occur from the back of the cylinder . At least it makes sense to me, especially since caps tend to go to hell pretty regular and besides having one one or more of 'em fall into the works can make cylinder rotation a pretty iffy proposition.

Conrad
 
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