I took 4 boxes of ammo to the range to see which type of ammo my rifle likes the best, at 50 yards. 
As it turned out, it likes all of them, but loves 1 of them the best.
This is all on a concrete shooting bench with the rifle on a full set of sandbags.
* Absolutely love the factory trigger in this rifle.
Bottom Left: Winchester 40 gr. JHP bullet at 1910 fps.
Top Left: Hornady Critical Defense 45 gr. FTX bullet that's a JHP at 1700 fps.
Bottom Right: Hornady 30 gr. V-Max JHP bullet at 2200 fps.
Top Right: CCI Maxi-Mag 40 gr. JHP bullet at 1875 fps.
I decided to go with the Hornady 30 gr. V-Max ammo, for varmints!
As it turned out, it likes all of them, but loves 1 of them the best.
This is all on a concrete shooting bench with the rifle on a full set of sandbags.
* Absolutely love the factory trigger in this rifle.
Bottom Left: Winchester 40 gr. JHP bullet at 1910 fps.
Top Left: Hornady Critical Defense 45 gr. FTX bullet that's a JHP at 1700 fps.
Bottom Right: Hornady 30 gr. V-Max JHP bullet at 2200 fps.
Top Right: CCI Maxi-Mag 40 gr. JHP bullet at 1875 fps.
I decided to go with the Hornady 30 gr. V-Max ammo, for varmints!