reloading some pyrodex rs

[westarm]

hey all, looking for some advice, I am reloading some 20 guage shells with pyrodex rs, I have found some plastic shotcup wads lying around that I would like to use, other than the fact that I have to cut them down a little, am I ok to do so?
I have used cardboard before many times and I realize they may melt a bit, but other than that has anyone else done this?
I will be using #2 shot, 40 grains of pyrodex rs, a 209 primer and a standard plastic shell.

I have used this recipe {only different amounts of powder depending on the guage} many times with BP and pyrodex in 410, 20 and 12g only never before with the plastic wads.
yeah I get it, its different but I enjoy it, thanks in advance

 

[LUTNIT]

I can't imagine a wad melting. It's exposed to the heat of combustion for a tiny fraction of a second; somewhere around 1/1000 of a second. There simply isn't enough time for enough heat to transfer. Plastic sabots in muzzle loaders with "100 grains" of powder experience zero melting and that is at higher pressures, temperatures, and velocities than a shotshell will undergo. The temperature of a projectile in a rifle is almost entirely caused by friction with the barrel, not heat transferred from the combustion of the propellant.

I've seen fired wads that some people claim are "melted" but all they've ever been after close inspection is deformed/gouged/crushed.

 

[westarm]

I can't imagine a wad melting. It's exposed to the heat of combustion for a tiny fraction of a second; somewhere around 1/1000 of a second. There simply isn't enough time for enough heat to transfer. Plastic sabots in muzzle loaders with "100 grains" of powder experience zero melting and that is at higher pressures, temperatures, and velocities than a shotshell will undergo. The temperature of a projectile in a rifle is almost entirely caused by friction with the barrel, not heat transferred from the combustion of the propellant.

I've seen fired wads that some people claim are "melted" but all they've ever been after close inspection is deformed/gouged/crushed.

great point my friend about the plastic sabots, never even thought of those, I have noticed the plastic hull experience some melt when shooting black powder through them but nothing substantial