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try to keep them between 1000 and 1050. With the cans I've shot, there isn't much boost when shooting sub loads unless your load is throwing unburnt powder into the can where it ignites. Even then, I've only noticed a 21 fps change (308 Trail Boss Load). However, those results came from a 10" barrel. I would not expect that to be an issue with a 16" barrel and the smaller charges found in a whisper.
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