I notice Ale8(1)'s 7 1/2" SBH weighs exactly the same as my 7 1/2" non-factory , 45 LC Bis Vaq.
An e-mailer tells me his SBH cylider measures 1.750" long. My Flat Top 44 Special's cylinder measures 1.609".
His cylinder diameter is 1.750". Mine is 1.675".
The point being here, considering the chambers should be comparatively the same, this is one area where the SBH would appear to gain an ounce or two on the Special.
On another thought, I own a pair of SS .357 Bisley Vaqs my better third bought for me in '99. Their cylinder windows will accept, with room to operate, every .357 Ruger SA cylinder I've ever tried in them.
We've had several .357 BHs and Vaqs that won't accept any other, than their own, .357 Ruger SA cylinder that we had at the time.
I hear grip salesmen state, "Oh. Ruger ain't like Colt. All their current grip frames for a specific model are identical. Any ol Ruger plow handle grip'll fit any other old Ruger plowhandle". Don't know if the cause is their casting of frames or what, but I've found this to hold reasonably true.
Their grip frames may be about the same dimension, but I know darn well all their cylinders or cylinder windows within model and caliber ain't.