My 38 Brazos based gun went to about 70k rounds until it was shooting about a 5” group at 20 yards. Tried to finish the year out before putting a new top end on it and wouldn’t you know it, about 1k rounds more and the slide broke at a National event. I figured 70-75k rounds out of a top end was good since it gets rode hard.
4 port comp, popped holes and all the powder I can fit into a case. As far as the debate on 38 vs. 9, I am partial to 38. I think it’s a more versatile round and a little more margin for safety. As far as picking up brass to save a couple bucks, order more brass. You’ve already spent a wad on the gun.