I have altered Mec Gar PT92 Taurus seventeen round mags to use as backup with that UC Pro. Totally reliable. Easy alteration. Carry 115 gr hollow points in the thirteen round gun mag, and 124 gr round nose in the backups.
Are you saying you carry both at the same time, one as a backup? Or that you alternate carrying each?
I shot a nice Taurus when I took my handgun classes.