For match shooting, practice with the gun you're going to shoot the matchwith. For carry, practice with the gun you're going to carry.
Accuracy training is fine, for what it is. Acuracy is the fundamental skill to master. However, you're going to need fast accuracy, and that probably means using a flash sight picture, learning the 5 types of focus, and learning the lines of demarcation when one changes to another. A typical"training session" for me goes like this (I shoot with a group of 2-5 other shooters):
1 full mag of group shooting. 2.5" circle at 25 yards. The guy who cuts the most paint wins.
1 Full maag of one shot draws on steel at 10 yards. The guy with the most dingers wins. The guy with the fastest draw with a hit is Matt Dillon.
Draw with 2 shots, 1 full mag. USPSA scoring.
3 Bill drills, 1 at 5, one at 7, and one at 10 yards. USPSA scoring.
3 El Presidentes.1 at 7, 1 at 10, and 1 at 15 yards. USPSA scoring.
Mini stages. We set up stages using 3 targets, weak hand, one hand, table starts--anything we think might be in a match. We'll run from 5-10 mini stages before quitting, and we'll shoot them 2-3 times each. USPSA scoring.