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This is what I have my experienced. I have fired, side by side, the following firearms, unsuppressed, with the same ammo. I've list them from loudest to quietest:
1. Sig Mosquito pistol
2. Ruger 10/22 repeater
3. Win 69A bolt, 25" bbl (borrowed from a friend)
Like explained above, the bolt is quieter for two reasons. The second one, I don't think has been listed, is the barrel is longer on the 69A than the repeaters. You can Google it up, but the reason is gases completely burn, expand and cool down in very long barrels before the bullet exits. The 69A almost as quiet as my suppresses 10/22. You probably have proven the opposite to be true. Remember how low your shorter bbl rifles are compared to your 20-28" long bbls, with the same ammo?
1. Sig Mosquito pistol
2. Ruger 10/22 repeater
3. Win 69A bolt, 25" bbl (borrowed from a friend)
Like explained above, the bolt is quieter for two reasons. The second one, I don't think has been listed, is the barrel is longer on the 69A than the repeaters. You can Google it up, but the reason is gases completely burn, expand and cool down in very long barrels before the bullet exits. The 69A almost as quiet as my suppresses 10/22. You probably have proven the opposite to be true. Remember how low your shorter bbl rifles are compared to your 20-28" long bbls, with the same ammo?