You can a liquid patch lube when hunting, but you probably should use some kind of " firewall" between the powder and the PRB. Some fold over a cleaning patch and run that down on the powder. Others use fillers, like corn meal, to protect the powder from absorbing oil from the PRB. Then other use wool " bore buttons", or fiber OP wads for the same purpose.
The problem you want to prevent is your powder charge being fouled by oil from the patch. The longer a liquid lubed Patch sits in a gun with nothing between the patch and the powder, the more the powder is fouled, and you risk either a misfire, or a partial burn of powder when you finally take that shot at game.
This happened to me one day, when I loaded my gun in the dark of the night, then sat in a tree all day and tried to shoot a deer about 4:30 that afternoon. Some of the powder had fouled, and the powder that did light only pushed the ball out of the barrel fast enough to hit the deer in his right shoulder hard enough that he fell down. The ball bounced off-- altho I have no doubt that it bruised the shoulder pretty good. The deer got up and walked away- boy, that was an insult!-- while I reloaded my gun.
I now use a filler when I load a gun for deer hunting. Its just safer to remove the problem at the outset, so your mind is not bothered by the possibility again. The bonus is that fillers do a good job of scraping the grooves of the barrel when they follow the the PRB up the barrel.
The sound of the shot going off was the " clue" that the charge had been fouled. I got a "cough" instead of a loud "ROAR" when the gun fired. I later found unburned powder on the ground in front of where my muzzle would have been located when I fired the shot. The next shot went off just fine, BTW, when I unloaded the gun at sundown.
I hope this helps. :thumbsup: