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Model 1 upper test fire question
New here and hope im not beating a dead horse with this question. I have an SSK Remington 700 bolt gun with an SSK suppressor. I bought a Model 1 300 whisper kit and built it into an AR about a week ago. The rounds I have for the 16 inch bolt gun work just fine. I am using subsonic 220 grain loads with H110 powder. I have yet to fire anything but subsonic through the bolt gun. I have been reading about throat dimensions and chamber differences with the Model 1 uppers. Obviously the quality of the Model 1 upper will not match that of the SSK bolt gun. So before I risk blowing myself up tomorrow I thought I would run some things past those with more experience in 300 AR platforms. The upper is stock just as it comes from Model 1. The rounds I have loaded so far are 150 grain Hornady soft point flat bases using 223 cases formed and trimmed to 1.352 with a variety of loads from 16.5 to 18 grains of H110. Due to chamber differences should I start with the light load of 16.5 grains of H110 and experiment with a shorter trim length? The reason for the trim length question is because i am using 223 cases and the chamber seems much tighter than the SSK bolt gun. I have chambered a fired case from the bolt gun into the AR and it felt pretty tight, but would still eject with minimal pull from the Chg handle. I only ask because of possible excessive chamber pressure from case length differences.
So with that said, i would like to know about experimentation with Model 1 uppers using 223 parent brass, various trim lengths and possible pressure problems. I also have AA#5, AA#7 and #9, Accurate 2015 but have had consistent luck with the H110 using JD jones load data. Thanks
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