I have the MK9 thats just an all steel PM9 and at the moment i prefer Federal HST +P 147gr ammo in it.
But i do own a box of Gold Dot Short barrel 127gr +P if i feel the need to swap.
I like the 147gr for the fact it will penetrate deeper, In theory anyhow.
I want that as my MK9 is a bug too my 1911, So if ive ran 17 rounds of .45 threw that gun and have to go with the bug i want a heavy load.
In reality i should carry Ranger 147gr flat nose FMJ considering why i carry the gun.
But i do have a few days the MK is my main and only gun due to different reasons, But its not often. So thats why i leave the HST +P 147gr in the gun.
BTW ive shot every high powered load besides +P+ which i think is an unnecessary load and the MK shoots as soft as it does with normal target loads.
People really should shoot a PM series gun and see what they are missing out on, Even tho i know others have gotten lemons before.