I have done this a few times as the P16 makes a good 10mm gun.
I have used both, although some gunsmiths have opined that a ramped barrel is less than optimal in 10mm and .45.
I am not a gunsmith, so I don't know.
Also one conversion has a stock Para barrel reamed to 10mm and the other has an Ed Brown non-ramped 10mm match barrel with early Briley bushing.
I have found that a 22lb recoil spring runs optimally with most loads in the Para 10mm.