I say with this gun, forget "target ammo"
Buy some 124 and 115 Grain Gold dots (std vel). if it feeds well rund 100 rounds through it. Do this at the range with other guns. Shoot one mag with the r9 and put it down and fire your other gun (s) for a while and the shoot the r9 again. Do this for 50 rounds, take it home and clean it well
Go back and repeat the above process and if it feeds 100 HIGH END CARRY ROUNDS, clean it and carry those rounds. Every visit to the range shoot that mag and replace with new rounds after a good cleaning.
Do not expect cheap ammo to function, if it does great, if not who cares. This is a carry gun and you dont carry garbage ammo.
It does not likerapid fire mag after mag. It will heat up and ftf. Rember this will not happen in the real world. If you survive one mag, you will not need to fire mag after mag on the steet. 3 3 3. 3 rounds in three seconds in 3 feet or less. Unless you are in Iraq, you are not going to battle.
Realize what this is and you will be thrilled. Expect this to be a range-take on the world in one sitting-gun and you will be dissapointed.
Don't push the spring to failure, replace frequently it will decrease the wear on the gun.
Clean once per week. You dont need to, but it is piece of mind.
Most important, dont leave home with out it.