A gent wanted to compete in revolver bowling pins and he didn't have unlimited amts of ammo to do it. He bought a 22 revolver as close to his competition piece as possible and set up beer cans at same range pins would be. Fired a few bricks (Brick = 500 rd bulk pack)
Premise: smaller tgts caused him to concentrate more and while recoil mgt was lacking, it maximized shooting time & practice makes perfect.
Result : he won his local competition. (the pins looked Huge after the cans)
Best Advice : Watch a few matches, notice what competitors are using & politely ask questions. Hopefully, they will let you try their rigs on a stage or two to see what "works" for you. Don't just sit on the sidelines - Participate !!! Gun people are extremely generous and will often loan you a rig so you can join in the fun.
My .02 - 1911s can be modified to excel in any competition. ( SA 5.25 - 2nd choice, is ready to go right out of the box in major & minor calibers.) Rob Letham might know a thing or two about action shooting...