I have a factory encore barrel that is ported. It is no where near as effective as my JP I have on my 300wsm, but you can tell a difference in muzzle rise (not that muzzle rise is a problem, as you dont have a second shot nor can you see the impact through the smoke cloud) so I assume it is working. As to droping powder and seating a bullet, the double ports are at 10 and 2 o'clock and single ports at 4 and 8 o'clock. I have not had any problems lossing powder or bullet seating.