I've heard this is why GSI uses a 2 die conversion process. 1st die is a rough cut, 2nd is a final trim. I used them with good success. I also did a few cases straight from 223 to 300 BLK with good.success though.

My best guess would be to spin the die down a little lower to see if it will engage the case sooner and then back the trimmer up to account for that.

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