I did it for a few years before other "life things" interfered, CAS takes a good chunk of your time.
As others have said, the top guys are usually fairly young and all of them are using well modified guns with wimpy loads.
I started off with a pair of original Vaqueros in .44Mag, one in 5-1/2", for strong side, and a 4-3/4" in a cross draw.
A Browning B92 in .44Mag, and a Stoeger Coach gun in nickel rounded out the arsenal.
The Ruger's had action jobs, I turned the pistol-grip Stoeger into a straight-stock, (English stock,) got rid of all the checkering and laid on 8 coats of rubbed down varnish.
Also modified the action, changed the safety from automatic to manual, and replaced the stock hammer springs with cut-down 1911 mainsprings, (you want to be able to just "flick" the gun with one hand and have it open and re-cock the hammers while your off hand is reaching for a reload).
Opening up the chamber mouths, (like throating a 1911,) and polishing the chambers really helps your speed.
You don't want to have to "dump" the empty shells, one "flick" and the barrels drop, a quick little upward "jerk" and the empty shells fly out, meanwhile your off hand is getting fresh shells, which drop into the throated/polished chambers quickly.
Note: most stages are won or lost with the shotgun, anything you can do to get your shotgun times down pays off big time.
Used Mag cases in the rifle, (.44 Mag rifles feed mag cases better than special cases,) with 200gr bullets and Unique.
Used Special cases in the Ruger's with 240gr slugs, (heavy bullets hit higher, and I wanted to keep the point of impact closer to the point of aim as best I could with the light loads).
When I went to BP I quit using the Browning B92 and switched to a Marlin 1994SS, it was a disaster until a good gunsmith worked it over, (it wouldn't run at speed without the action getting totally locked up).
Oh, you put 6 rounds of 12ga with BP as fast as you can thru a double and the barrels can boil water. Lol.
You might like it more than you think, have fun.