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Does anyone have experience with RWS small rifle primers?

Ive shot some in a small pocket 45gr capacity 6mm and they didn't compare w/ Remington 7 1/2s. I haven't n had a chance to try them in 223 as yet.
 
I loaded a ladder test starting with 20.4 grains of LT-32 powder, once fired Winchester .223 brass, RWS small rifle primers and Hornady 52 grain hpbt bullets seated at 2.200". In .3 grain increments I've gone up to 23.2 grains. My velocity window based on published data should start around 2950 fps from a 20" AR-15 and gradually climb to 3150 fps on the high end. I'll shoot for groups and chronograph on Friday then report my findings.
 

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