I am new to Sig Talk but want to ask a question. I have a Sig p229 .40 caliber (2016 model) and I want to start in competitive shooting major caliber. I would like to know what is the largest capacity magazines (quality) that are available for this pistol to shoot competitively. Also what companies sell mag extensions for this weapon. I have Sig 12 round mags but would like more capacity. I prefer the 320’s but Sig says they are only being produced in 9mm’s and doubtful they will ever produce .40/.357 Sig in this platform again. Any help would be most appreciated!!