Anything that burns anything can use up oxygen and produce CO2. Even though your blind isn't close to being air tight, if the rate of CO2 production is higher than the rate of air exchange it can KILL.
Here's an alternate, line the inside of the blind with "space blankets". No worry about CO2 and the very reflective sheets can "cook you out" from body heat alone under the right conditions.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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