Is it a mold temp issue?
Lead temp? Dirty rough mold?
Are you descuming(Linotype can be dirty) or using a bottom pore pot?
I used to use Linotype but ran out and as I have an almost unlimited suply of old lead plumbing flashings I started using that, and had a few learning curves until I got it right.
A hardness tester helps a lot.
The cast bullets forum is VERY helpful
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