I'd say the biggest difference is that on the breech plug area...easier to clean off when you're done shooting than with other primers it seems. The bore? If you're swabbing between shots you shouldn't notice a difference. If not, you might see some difference in loading ease for consecutive shots. I do when shooting APP powder. The primers make the crud of the loading so full power vs. KB or T7 primers can be noticeable after a few shots without cleaning.