First Mule Ear.... Welcome to what I found to be the most fun shooting sport around.... SASS that is....
IMHO: "IPSIC" is way too serious as in my experience "Elitists"; continually, NCOW is way too "Traditionally Limited" hung up on the "Period Correctness" argument to a point of frustration, but still fun in it's own right; conclusively, SASS definitely has it's aspects of the previous but you go with a posse that is SAFELY relaxed to a clownish FUN...
I first started with borrowed Ruger Super Blackhawks with 10.5" bbl's...... TOO FUN but slow.... dislocated my shoulder break'n leather from the hip... it took great discipline to acquire the front sight before trigger pull....
First pair: owned {OMV} Old Model Vaquero's w/ 5.5" bbl's bought used from a "Gunfighter" class fella in 357 mag. as I had a huge pile of 357 brass already owned.... Shoots great and quick front sight gather'n for "Cowboy Race Gunn'n"..... With the rule change I also installed Super Blackhawk hammers....
Next pair: Ruger Bisley Vaquero's like you shown earlier but in OM / never shot with 4.625" bbl 'n 45 Colt..... Fits great in hand with the low hammers and shoots great with the Long Colt rounds..not too different from the 5.5" bbl..... My favorites so far.....
If I was going to do it all over again.... I would save up for a pair of the Ruger SASS Vaqueros in 45 Colt.... they're put together with all the whistles and bell favorites of the CAS folks..... I would "rent" a pair of something in the 5.5" bbl from a fellow shooter until then.... Then again..... if ya find 'em a 7.5" bbl..... LOOKS REALLY COOL!!!!
How ya like all this macaroni !!!!
Yeti