I'd clean the old lube off of them, then pan-lube with SPG.

I have not had great luck re-applying Bore Butter. Maybe there is a different formula just not sold here, but when I tried cleaning off the dried lube and re-lubing with what comes in the tube and the applicator attachment, it was messy as hell and wouldn't stay on the bullets when they got warm .. not at all like the original lube that came on them.

Pan lubing with SPG worked out really well for me.

Anyone who thinks there's two sides to everything hasn't met a M�bius strip.

Here be dragons ...