Jim Nasium
40 Cal
I'll be what looks like the third guy to suggest blowing it out from the nipple if you have access to air and a blow gun with a rubber nozzle cone. It's the quickest and cleanest method I know of.
I remove the nipple. The cone of the blow gun makes an air tight seal with the bolster. My regulator is usually set at 90 psi and that will blow a .54 caliber round ball through both sides of a thick cardboard box with quite a respectable report. I've never used any lubricant, but if you want a sure deal with what sounds to be a tight load, pour some lube down on top of the projectile prior to pressurizing the barrel. This will ensure once you get it moving, it stays moving.
Point the muzzle in a safe direction. Every time I have to do this it reminds me that I need to build an air cannon.
Good luck
I remove the nipple. The cone of the blow gun makes an air tight seal with the bolster. My regulator is usually set at 90 psi and that will blow a .54 caliber round ball through both sides of a thick cardboard box with quite a respectable report. I've never used any lubricant, but if you want a sure deal with what sounds to be a tight load, pour some lube down on top of the projectile prior to pressurizing the barrel. This will ensure once you get it moving, it stays moving.
Point the muzzle in a safe direction. Every time I have to do this it reminds me that I need to build an air cannon.
Good luck