Details! I need details, please!
My recipe is:
-45 Colt brass, flash holes drilled out to leave just enough for the anvil to seat against (~5/32")
-whichever LPPs you have on hand
-0.3cc Lee scoop of Clays; Any
fast pistol powder will do. With Clays, more is too loud, less seems a mite underpowered. Use whatever you have on hand.
-a cardboard wad (notebook backer, etc), tamped down on the powder.
-a case full of used Walnut media, tamped down
-a second cardboard wad over the rice, tamped down to get it into the case
-a fairly heavy crimp over the wad. . . they don't uncrimp on firing, so you only crimp the first time
Notes:
A 45 ACP case, over-flared and inside-chamfered until sharp, makes a dandy punch to produce the cardboard wads. This is the longest part, and I'll buy Wads next season. . .
If you don't drill the flash holes, you will re-discover that primers partially unseat against the recoil shield upon detonation and reseat during pressure rise; in this case there's no real pressure so they stay unseated, tight against the recoil shield, locking the gun up.
The report is roughly equivalent to a loud paintball gun, so it's hearing safe. This recipe will penetrate a paper poster at 4', but not at 8'; my wife can attest that it will not harm a rose bush from 6' away.
I used to use White Rice, but the ground walnut requires less tamping to get tight.
Edit: I guess I should point out: don't use the drilled brass for full-power loads. . . pressure could be higher with the gaping big flash hole.