I am a first time gun owner. i bought a hi-point c9 handgun this week and dont know too much about the ammo i can use in it. i know i cant use +p+. but can i use +p? and does the ammount of grain matter? the bullets that i bought with the gun were 115 gr...but the ones i want to buy i belive are 147 gr....does that matter? what does it mean? any number i shouldnt use? thanks for the help.