I have two carry pieces, both in 9mm. This saves on target ammo pricing, but not on defensive ammo, since my everyday carry will eat +P, and my LCP won't:
- SigSauer SP2022
- SCCY CPX-2
When I carry the former, with 17+1 (using a +2 adapter), and a second 15-round mag, for a total of 33 rounds.
When I don't want to carry as much bulk, I carry the latter, with 10+1, and a second 10-round mag, for a total of 21 rounds.
Spare mag is always in the back pocket of my weak hand side in a Remora mag holder (interchangeable for both)