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Thanks for all the inputs. I see there are a lot of different ideas out there.
From all the reading ive done the data on brass annealing and quick or slow cooling supports the post from sneeze...

Sizing is Redding Neck die & to bump shoulder I use Redding body die. Thanks bully I’ll pm u about the amp option. Cheers

Annealed plenty of brass with no issues previously - the question I’m raising is could the split necks result from annealing , either over or under cooked. My research agrees with comments above,...

Brass is all Hornady, no not neck turned

Brass all same - Hornady & all 3-4x fired.
Heat just long enough to see the blush & then dump onto large stainless bench to cool.
I’m guessing the split necks means I over cooked ?

Annealed some 3-4x fired 284 brass. 6.5 - 7 sec in single flame gas torch, all cases on next firing came out with split necks ? Too much heat ? Or not enough ? 78335
Cases not annealed no cracks...