You should be able to get 1000+ shots with every breechplug in that Omega - if they are manufactured correctly. How many vent-liners with 1000 shots?

I have over 1000 shots with my original flat-face Omega breechplug. May get another 1000 shots with it... I dunno!

The touch-hole is larger in my spare deep, concave breechplug with approximently 100 shots on it - than the often-used flat-face one with 1000+ shots.

Remember.... governmental manufacturing variations are "more"-allowed in this industry... versus centerfire industry- thus you will get factory component products with measureable variations.