I was doing some load development today shooting 8208 and 123 amax , 2.260 oal, alowing barrel to cool between 5 shot groups .
started with 27.6 then 27.8 and 28gr. the groops got consecutively smaller up to 28gr. At 28 the groups were a little under 7/8 inch at 200 yds .
When I moved up to 28.2 the groups went to almost no vertical but strung each shot further and further horizonal to the right with each shot . Group measured 1/4 vertical but 2 1/4 horizonal.
Anyone have any suggestions?
I am completely baffled sense the groups before were very consistent but adding .2gr would make it go so horizonal
started with 27.6 then 27.8 and 28gr. the groops got consecutively smaller up to 28gr. At 28 the groups were a little under 7/8 inch at 200 yds .
When I moved up to 28.2 the groups went to almost no vertical but strung each shot further and further horizonal to the right with each shot . Group measured 1/4 vertical but 2 1/4 horizonal.
Anyone have any suggestions?
I am completely baffled sense the groups before were very consistent but adding .2gr would make it go so horizonal
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