Another interesting gripframe, now deleted from the '05 Ruger catalog, is the BHG (Bird's Head Grip). This round, almost ball-like, grip typically has Micarta stocks, so it rotates, or 'rolls' easily in your one hand grip under recoil. I started with a SS 4.6" Vaquero in .45 Colt so-equipped. I fitted a SS Bisley hammer to aid one-hand use. Not a particularly accurate gun, obviously due to the Vaquero's fixed sight, it is a fun piece. Heavy recoil causes excessive 'rolling', so it is not a great candidate for the heaviest .45 Colt loads, although the gun and grip would take it. I wanted a .44 Russian/Special version - with adjustable sights.
I had to make my .44 BHG. I ordered a QPR BHG kit - and bought a new 4.6" SS SBH. The combo is super! I have shot some of my 'wimpy' .44 Magnums - actually barely over 900fps 240gr LSWC's, just Specials in Magnum cases. Yep, it rolls a bit. Hot Magnum loads would result in the muzzle aiming skyward - or back! The adjustable sights help with my wide variation in ammo. The ball-like grip is a fun and quick grab with my medium-large hands. The Bisley is still the best for larger grips - and recoil.
Your best bet is to try a BH/SBH; Bisley/Bisley-Hunter/Bisley-Vaquero; and even a BHG - hopefully, all from a well stocked Ruger dealer. QPR & Brownell's are great sources for BHG and Bisley gripframe conversion kits, should you not find exactly what you want. I still want a 4.6-5.5" SBH with a Bisley grip...
Stainz