Caleb, yes Sir, I have run 147gr +P Federal, Underwood and Doubletap without issue in my G3, G3C's and G2C's. Just clean and inspect them a little more often as +P will accelerate wear and tear. Cheers and stay safe!

Caleb, taken directly from G3C user's manual "Even if your Taurus
firearm is rated for Plus-P (“+P”) ammunition, such ammunition generates pressures
significantly in excess of the pressures associated with standard ammunition. Such pressures may affect
the useful life of the firearm or exceed the margin of safety built into many firearms. Unless you need +P
ammunition, do not use it, particularly for practice."

Yes all of the G3/G3C are rated for +p ammo, and will cycle reliably, I prefer the 124gr Federal HST +P (better velocity, and more consistent expansion in my experience, but your milage may vary)