It's a little surprising you're getting that kind of results shooting the 55's out of a 1-10tw. Curious, what elevation are you shooting from? I'm going to guess you're a few thousand feet above sea level which could help explain why that 1-10 is working for you but maybe not.
I have a 20-250 build it the works right now that will be finishing up a little after the first of the year but I went with a 1-8tw Krieger to be safe at all elevations.
Have you considered trying any RL16? I think RL16 will yield a little better velocity and be more temp stable than RL15.
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