On my Maverick I usually fill it to just short of 300 and when I target shoot it's usually just under 200 when I shoot my daily 60 rounds or so and I just keep it there and accessible for a pest in the backyard opportunity. My first reg is set at 150 so anything above that is fine. But I have no problem filling it and letting it sit for however long it is until my next shooting session. If I won't be shooting for months I'll keep it just above 150.
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