Nothing like going right to the top!
Starting out on .45 revolver with 325 gr, 1300 fps loads is a little like learing rifle by skipping right past the .22 rimfire and going right to a .300 Win Mag. Sure, it can be done, but you'll develop and need to unlearn a lot of bad habits along the way.
At least--At the VERY least, buy a boy or two of the light, "Cowboy Action" .45 Colt loads--or, better still, some .45 S&W ammo-- The "Scofield" load. Short cases, to easily tell the difference. Recoil, etc, approximating .45 ACP. Use these. Then move to NORMAL .45 Colt loads--a 250 or 255 at around 800 fps. this is plenty for most people. Then, if you wish, move along to the heavy loads.
In answer to your question: No, sorry, I haven't shot a .454 SRH. I HAVE shot a couple of full-size, full-weight Freedom Arms Casulls, and they wee far from pleasant.
The .454 Casull revolvers and full loads are purely and simply hunting loads, or for self defense in big bear country. I can't imagine any whitetail deer noticing the difference in a .45 Colt hunting load and a .454 Casull--Energy of the latter is wasted on the far side landscape. Moose, elk, etc, sure--go with the big stuff if you want. Mule deer fall somewhere in between.
I'd rather use a .45 Colt, 270 SWC at about 875, that I can easily control, for most of my hunting needs, than a big ole cannon I can shoot well for one, maybe two shots. Maybe I'm just a namby-pamby, huh?
I know I'd feel different if I was out and about on Kodiac Island and couldn't keep a rifle at hand.
Best,
Johnny