Interesting your rifle doesn't like 55 grn. More than abit weird to be honest. In theory any .223 should. How bad is it?? Have you tried other brands,speeds,seating depth??? Is rifle happy with different weight?? If so what's the single biggest difference, speed,seating depth or is is purely weight related....eg projectiles over stabilised...bit of an oxymoron that one if talking fmj.
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