Proper seating of the bullet ensures that there is no air gap between powder and bullett. When you load the barrel with either powder or pellet, and you have the bullet firmly seated on the powder, you can mark your ram rod with a knife. You do this at the point where the ram rod and the end of the barrel meet. This way every time you reload, you will know the bullet is properly seated by checking the ram rod. I have done this as well and probably should be done once you determine the optium load and bullet type you are your gun like to shoot.

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