Greetings...

[Beagle333]

Barrel gap

On my Pietta's, you can bang on the wedge until you're happy with it, and it isn't going to make any difference. But on the Uberti, if that thing gets more than a light rap with a screwdriver handle, I can't spin the cylinder. The wedge must be just lightly tapped snug and even then I take a box of Baby Wipes with me, because after just 6 shots, the cylinder face must be dressed up a bit before the next round.


Doc, I have wondered that same thing. I have found in my chart (Black Powder Handbook-Sam Fadala) that bp spikes almost immediately in the burning curve and then falls off a bit, and then has a long smooth burning curve. 'Not sure how far the bullet has moved before the pressure spike starts to fall off though.

 

[Doc Hoy]

There is an awful lot....

... I don't know having to do with the forces that accelerate the bullet and move it toward the target. That includes things that happen outside the barrel when the bullet is just one or two inches past the muzzle.

With several of my revolvers I can get more speed by increasing the powder charge but when I go beyond a certain point, accuracy declines. I think that phenomenon is fairly universal.

I think that has to do with powder outside of the barrel continuing to ignite creating forces that are not confined by the barrel. Consequently these forces are far less predictable in the acceleration they impart to the bullet.

I have never read this. I have never done any scientific inquiry. I have never had anyone verify that it is true, but it certainly seems to work this way.

I would be happy to have someone who knows, tell me I am right or wrong.

Tnx,

 

[mykeal]

Doc, I don't know if this constitutes 'knowing' or not, but my experiences agree completely with your empirical observations.

 

[Hawg]

. It doesn't really appear to me that the barrel is tipped up, in fact when I use the feeler guages the gap seems to be quite parrallel all the way around.

I guess it's just a trick of perspective/camera angle then.