I’m not sure why one would use them. Once you coat your barrel you aren’t suppose to switch back and forth to bare bullets without cleaning. Also pressure creates velocity. Molly bullets lower pressures therefore most had to add to their powder charge to create the same velocity. Kinda silly, but if you got ‘em shoot em.
I moly coat for 1 rifle. It allows me to load long with more velocity and less pressure.
I have some coated in another caliber but haven't worked up any load development to see what the advantages are with it.
if you didn't want the moly on them you could clean them up with barkeepers friend and re polish them. I posted how to do it here somewhere. My end result didn't look as good as it could have because my cob was dirty when I did it.
On your moly bullets , depending on how well they were coated it may not all totally come off. I didn't try the Barkeeps , I just tossed them in with some 223 cases in my walnut hull loaded vibrator . They came out with dark shinny tint.
Depending on what Cal. and what you shoot, just load them and go kill some "zombies" or use them to fire form some cases.
Depending on how many you have shot, give your weapon a very good cleaning.
Me , I switched to HbN on my factory barrels.
I put them in a glass jar in the barkeeper solution then set that in the ultrasonic. Mine weren't copper colored when they came out but the molly was off and the polisher almost got the rest.