223 seating depth and rcbs thrower and cfe223 powder questions

I've been testing a ARstoner 24" barrel and it seems to like 28.2gn of cfe223 with 53vmax at 2.30 oal. (ss mag needed for the length). Getting speeds of 3450fps with impressive grouping.
The same round reached 3580fps out of my ruger american. (Might check groups this weekend)

Btw. Yes it is flattening primers
 
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