The ones I checked were Zn. Use a cutting pliers to test. I passed one up I saw on the road because the one I had was Zn, must have fallen out of a truck.
I took one of those pool sweepers apart once. Wasn't into casting at the time, but been saving lead for a long time. Didn't look like lead to me, so I pitched them into the scrap pile. As NYFirefighter357 said, test with a pair of dykes. Or use a drop or two of pool acid. If zn, it will foam up.
Tin snips cut through these, and the YouTuber I saw was casting bullets with his. I'll see if I can find the video again.
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BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |