I can't comment on the quality of Monarch ammo.
What I normally tell people is to select their defensive ammo and then look for a FMJ type round with the ballistics as close to your defensive ammo as possible. You want to fire the same bullet weight at the same velocity as your defensive loads or as lose to it as possible. Winchester is now making that a reality with their latest line of ammo, but you can do the same yourself by checking the ballistics of ammo form each manufacturer.