I got an order for an inside the waistband holster for a Ruger SP101 357 magnum without access to the gun, I told him sure I happen to own the same gun it has a 2 1/4" barrel right? he said no, this one has a 3 1/4" barrel...oh oh.
I have a pretty well set up knife shop so I made a wooden plug contoured to the barrel 1" long and used that to vacuum form the holster to the gun. it came out good, I'll see the gun on Friday, it should fit perfect, hopefully.