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9mm to .223 on a 550c

Ok here goes it.  I’ve a RL550c that I’ve been using to load 9mm and now I want to convert it to load .223.  I’m using Varget but am having trouble increasing the charge size.  With the 7/16” headed bolt I’ve dialed it all the way in and get (sometimes) 18grains and that’s not consistent.  Thoughts, suggestions or ideas welcome.

Put the larger powder bar in, problem solved.  Thanks

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