I've used toilet rings for lube for 35 years with no problems. I've shot 100's of handgun
silhouette matches pushing a RCBS 165 gr bullet a 2000 fps from my 308x1/5 with no leading.
I'm older now and have been buying some commercial lube now, but I've used the toilet
bowl rings for all my cast bullet shooting both handgun and rifle with wonderful results.
leadhead