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I bought some 30cal M80 FMJBT w/ cannelure bullets to reload. They said that the bullets were handpulled . But the bullet below the cannelure had some black glue or laquer on it. I put it a vibrator case cleaner and ran it for 3 hours but it didn't come clean. I then put "Goof-off" cleaner on it and it came off. Is it necessary to clean this off and is there a easy way. It seems to me to clean each bullet with "Goof-off" would take some time. Thanks!
 

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....case sealer

The tar-like substance is a military expedient method of sealing the bullet to the case for water-proofing. This was done per contract specs and most often the primer was also sealed,usually w/red or purple colored sealer. It does not affect the bullet or the burn rate of the powder. Leave it on the bullets...save yourself the hassle.
 

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Sounds like someone pulled the bullets out of all there OFV (AKA Indian) marked rounds, These rounds are on the surplus market and for certain years they had a quality control issue of under powdered rounds (squibs) the bullet would lodge in the barrel and the next round fired would go KA-BOOM. The only problems with the tar sealer have been the guys shooting HK G3 style weapons (Fluted chamber) as the tar fills the flutes and the weapon then jams with a round stuck in the chamber. Do to the squib problems some importers have pulled the rounds and broken them up for componets in reloading.
 
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