I'm not sure what the case pressure has to be to seal the casing in the cylinder chamber. But the casing must have a certain amount of pressure from the powder being ignited inside of the casing to seal the casing inside of the revolver cylinder chamber. What this means is, when you pull the revolver trigger, the round goes off. The powder is ignited inside of the casing and pressure builds up inside of the casing. The pressure gets high enough to push the bullet out of the casing. When the powder ignites, the casing will expand to the diameter of the cylinder chamber if the round has enough powder inside of the round. If there is not enough powder to expand the casing to the cylinder chamber, the bullet will still exit the casing cause the neck tension and the crimp wasn't strong enough to hold the bullet in until the pressure built up to push the round out of the casing (powder burn rate also applies). Low powder charges will not yield enough case pressure to seal the casing inside of the cylinder chamber. To sum this up, since the casing didn't have enough case pressure to expand the casing to the same size as the revolver cylinder chamber, some powder residue will leak between the casing and the cylinder chamber. This residue will sometimes come back toward the shooter and hit them in the face. Eye protection is a must have when shooting powder puff (aka....bunny fart) ammo in a revolver.CT_Shooter wrote:I don't understand what it means, "seal the casing in the cylinder". The spent brass and the gun never show any signs of unburnt powder using the lower end (not lowest) of the published data that I use. And, yes, I always wear eye and ears. Can you elaborate? Thanks.Rugerfanboy wrote: Since you only use the low end of the powder charge, be very careful cause low powder charges for revolvers don't always seal the casing in the cylinder and sometimes, burnt powder residue will come back at the shooter. Remember to always wear safety glasses when shooting, specially a revolver. This is one thing that I check when I'm working up load data for a revolver.
It doesn't matter is it's a jacketed bullet, a lead bullet or even a plated bullet. How much powder you put inside of the round will determine the case pressure. Also, case volume will effect the case pressure. Seating a bullet deeper in the casing will yield a lower case volume, which will increase the case pressure when the powder is ignited.CT_Shooter wrote:I'm editing this to ask another question that occurred to me while loading a box for the range. I only shoot jacketed bullets. Does this potential safety issue pertain more to lead than jacketed bullets in revolvers? That would seem likely, though it's a new consideration for me, so... thanks again.
As in my case (picture), the mixed brass casings had different volumes and that changes the amount of pressure, which also effected the velocity. The Blazer brass casing had less case volume, which yielded a higher case pressure, which in turn, caused a higher velocity in that round even thou the Blazer casing had the same amount of powder as the Remington Peters case had and the bullets were seated the same depth.
I hope I've explained this so that you understand. If your still confused, ask and I'll try to explain it another way.
