Your cast lead bullet might be making contact with the throat and preventing chambering. Take a permanent marker and scribe from around the case mouth to the ogive of the bullet to see if it is engraving when chambered. When my Whisper barrel comes in, I'll be shooting the RCBS 308-200-SIL bullet cast of wheelweight at 215 grains. I'll let you know how it turns out.
Kevin
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Can you hear that? It's our founding fathers turning over in their graves...
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