Leave a couple of inches in the tube to be totally safe. Anything below 1 inch is perilously deadly. Between 1 and 2 inches and it's subjective depending on quality of components, maintenance, etc.
@Velocio started
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Leave a couple of inches in the tube to be totally safe. Anything below 1 inch is perilously deadly. Between 1 and 2 inches and it's subjective depending on quality of components, maintenance, etc.