I am going to be adding to my little collection soon and I am also thinking of shooting some USPSA at a local club for fun. I was going to go with a basic practical setup, but meh that is boring.

If I wanted to shoot revolver I know a 625 is the king, what about the M325 Thunder Ranch? Would that be allowed or am I missing something?

It's legal. Whether you enjoy the light weight with major power in a USPSA match is up to you.
Product: Model 325 Thunder Ranch

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Science plus Art

Yes, the self abuse factor. The best USPSA revolver gun is probably the heavier (discontinued) 5" (stainless) 625.

If I were going to shoot a 325 in USPSA, I'd load up some minor loads. I would do that not only for my hands sake but for the gun's.

Just shoot all "A's" and it wouldn't be a problem.

My main USPSA wheelgun is a 25-2 with 6 1/2" barrel.

Dave

Dang, so that's the secret? Just shoot all A's! So simple! <slaps head>

Even shooting minor you'd still be at a disadvantage with the 325 because it would still be lighter and take longer on recovery than the same loads in a 625.

I shoot USPSA with an older, Andy Cannon tuned 625 5", loaded with 4 grains of Bullseye and 230 RN lead and it works out pretty well. I purchased a 4" 610 a couple of years ago and I keep threatening to try it out as I figure that the 180's in 10mm would be quicker to recover between shots, but I can't seem to put down my 625!

I am waiting on a holster for my 610 and hope to give it a try as well. I will be shooting 40 S&W as I dont reload. The 610 is a great choice, you just have to be a little more precise on reloading as the holes in the cylinder are not the giant caverns that the 625 has.

Yup! It is that simple.

I also agree the 325 will be slower and, I'd bet, a bit "whippy"

I use a 4" 625 that I got a great deal on a few years back. I bought a 625 JM last year and let my friend use it for a couple of local matches... it now belongs to him.. I know that I'll come across another that will be calling my name.

Two years ago I shot a local IDPA match and one member of the group was shooting a S&W 325 with factory loads. He was a husky fellow and handled the recoil well. Personally I prefer the all steel S&W 625.
One caveat, I have a S&W 327 PC JM version wth alloy frame and titanium cylinder - the lightest you can get kin an 8 shot 38/357. I only shoot it with mild loads of 38 Special (158 gr.@ ca 700 fps). It is pleasant to shoot and comes back on target faster than my all stainless S&W 627PC gun.

Lighter guns reset faster, but most people aren't capable of taking advantage of it.