I was loading 10.7gr of AA#7 with Nosler 200gr Jhp with good results in a S&W 696. The next batch of #7 with the same load left partially burned that tied up the action.
I would think a 624 could take more pressure than a 696, and if AA#9 would work it would take a over pressure loading.
I've tried HS-6 and Blue Dot but my best results for my 696 have been with W-231, AA#5 and Unique.
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