Bullets=Jacketed projectiles
Boolits=Cast Lead projectiles

It's just jargon. Every group of people that hang out together, in person or online, create new words and terms to communicate more effectively. For example- you can post on this forum talking about P&R, Cokes, TT and TH, RR/WO, etc. and most folks understand what you're talking about. Now I see many of these terms show up on other boards and people understand what they mean. Boolits is no different. Just a word coined to differentiate between two types of bullets.

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Andy