Quote:
Originally Posted by Jent P Mitchell III
A lite load of 7625 can lead to detonation instead of the correct burning of the 7625. I have seen 7625 bulge the barrel just in front of the chamber when the reloader/shooter was trying to achieve a low pressure reload using 7625. Do not try to go to low with 7625. Use enough or more then enough 7625 to achieve the correct burning rate of the powder.
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Catastrophic gun failure due to the condition called detonation in a shotgun is very unlikely if not impossible. It is an easy fall back to blame an over pressure condition created by a barrel blockage or an overcharge from too much powder or the wrong powder (too fast).
In metallic cartridge loading it is thought the gap between a seated bullet and a small amount of powder can create the conditions for a detonation. This condition can't exist in a shot shell because wads are seated on the powder and the seating of the wad is insured by crimping the shell. If such a large space were to exist the shell could not be crimped properly and it will dish in. Shotgun shell detonation from too little powder is myth, there is no scientific testing that proves this can happen.