I've got a set of Texas grips Mesquite burl on my Ruger 44 special flat top. Haven't shot it a lot but just loaded up a couple of hundred 44 specials and 45 Colt for my USFA Rodeo.
After a particularly bad streak of luck in which I had to put down three of the family's beloved saddle horses in the course of two weeks. I used this .45colt Blackhawk. I had Psalm 23 laser etched on these Tru-ivory grips. I like ivory on blued revolvers.
Took a look at what Texas Grips has to offer: https://texasgrips.com/product-category/pistol-grips/ruger/ I love the color and grain of the Mesquite they use. However, an individual would have to call and find out if the size of their grips is in any way different from factory. The OP must have a large hand, and is looking for wider and longer grips than factory, It can be very frustrating to try to find the grip that fit your hand.
I don't know the caliber of your "magnum", but mine are 41 and 44 Magnums, large frames, both with Bisley grips. The 41 was a conversion using a kit I bought from Ruger. The 44 left the factory as Bisley, later cut down to 6" barrel from 7.5". The Bisley grip was the answer for me to comfort and flinch.
Thanks for the mention of Texas Grips. My 357 Blackhawk was made in 1955. It came with some crappy plastic grips that didn't fit right. It now has holly Texas Grips that fit perfectly. The finish has that purple-ish tinge some of the old BHs develop. That almost pure white looks great against the dark finish. I put rubber grips on the magnum Blackhawks. It's easier on my aging hands. But the BH above will only see 38 special wadcutters, so I can have both great looks and comfort. Jeff
Bearpaw custom grips. Fatter at the top, narrower at the bottom. I have these on all five of my Ruger single actions and couldn't be happier
