over 3,000 shots in my original Accura when i sold it. No wear and no looseness. I used a lot of Thors is that which are very sensitive in barrel diameter changes and they all loaded like the day i got that Accura.

I still have over 1,400 rounds in the closet to shoot this winter and i highly doubt i'll find any wear in my old or new Optima's.

then again vent liners, knight, savage or homemade for you seem to wear out after only 100 yards while im still running my original plugs.