So I was reading thru the rules for SSP

2. Stock Service Pistol Division (SSP)


Should division
capacity not be achievable because of lower magazine
capacity, load to maximum mechanical capacity of magazine
plus one (1) round in the chamber. Competitors must use the
same capacity magazines through out the competition
20
(Example: if you start with a 9 round magazine, you must use
that capacity magazine throughout the match).

So can I use two 10 round mags and one 15 round mag?