Let me start this by stating that I'm a perfectionist lol Aside from the Winchester SX3 that has the cantilever turkey barrel, we are forced to mount scopes and red dots to the receiver. While not much, everytime we remove the barrel for cleaning, it will seat (slightly) different. Hence, without a barrel mounted scope we lose our EXACT zero. Anyone ever notice issues with their setup. I don't think it'd matter much unless you had a bird right off the end of a barrel, just curious
I mark the mag cap once dialed in...
I also use a laser bore sight to check zero if the gun is disassembled....
Pics on the cell phone before and after helps too....
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I tighten the mag cap the same each time and have not had a problem.
It's a shotgun at 40 yards, not a rifle at 300. There's already far more shot to shot variation than you are likely to introduce by removing and replacing the barrel.
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Great point by alloutdoors. Shotgun patterns vary so much from shot to shot that I would not worry about the possible difference made from removing the barrel. You would never be able to prove any difference if there is one. No two shotgun patterns are alike, sure the #s may be similar but the placement of the pellets within a 10, 15, 20 or 30 inch circle can and will vary shot to shot. And that is when everything else is equal which is rare under field conditions.
Now if something is different when you hunt, than it was the day you patterned, such as temperature,wind (speed or direction), altitude, humidity, or air pressure then it will affect your patterns also.
I wouldn't worry about it.