01-12-2016, 11:51 PM
Given the same ammo bullet velocity exiting the muzzle and entering the suppressor will be the same. The suppressor will then actually increase the velocity slightly. The phenomenon is called 'Free-bore boost'. It is only a couple of fps more than if there were no suppressor and is because pressure is maintained behind the bullet for longer.
If it was the first round through that suppressor from the factory then perhaps there was some contact with the baffles creating a 'brush fit', similar to shoot-through rubber baffles. The friction of the slight contact may have slowed the bullet slightly but not enough to cause it to yaw and baffle-strike. Subsequent bullets now have a clear path to travel.
Other than that the reason is something other than the suppressor.
If it was the first round through that suppressor from the factory then perhaps there was some contact with the baffles creating a 'brush fit', similar to shoot-through rubber baffles. The friction of the slight contact may have slowed the bullet slightly but not enough to cause it to yaw and baffle-strike. Subsequent bullets now have a clear path to travel.
Other than that the reason is something other than the suppressor.