I read many posts about having to place the little finger under the grips of most non bisley single actions, due to the grip size of the blackhawk i have to as well, and so saying, most of my rugers stay in the safe because of it. Growing up with a colt SSA 44/40 with 1860 army grips has made my decisions easy about adding a bisley grip frame to my requirements for a revolver i actually want to shoot rather than take out to see if it still does.
Howdy Again
Quite a few years ago, when I was thinking of starting to load cartridges with Black Powder, I was advised to buy Rugers with the Bisley grip to compensate for the stout recoil Black Powder cartridges generate. So I bought a Ruger Bisley Vaquero chambered for 45 Colt. I took it to exactly one match, decided I did not like it, and sold it. I know a lot of guys swear by the Ruger Bisley grip for heavy recoiling ammo, but I just did not like it.
About that time, I discovered if I curl my pinky under the grip, that lowers my grip on the revolver enough that a space of about 1/4" opens up between the knuckle of my middle finger and the rear of the trigger guard.
I shoot my Colts all the time in Cowboy Action Shooting with full house 45 Colt Black Powder loads.
This is how I hold a Colt. Notice the pinky curled under the grip. Notice my thumb reaches the hammer spur very easily in order to cock the hammer. More importantly, notice that gripping the revolver this way opens up a space of about 1/4" between the trigger guard and the knuckle of my middle finger. A 45 Colt cartridge loaded with Black Powder generates stout recoil. I know guys who complain about their knuckle getting whacked by the trigger guard when the revolver recoils. The 1/4" or so of space between my knuckle and the trigger guard prevents the trigger guard from whacking my knuckle. As I say, I shoot my Colts like this all the time, and I never get my knuckle whacked, despite the stout recoil of my ammo.
This photo shows the position of my hand, and thumb, as I cock the hammer.
This is an antique Colt Bisley model. The Colt Bisley grip is a bit different than the Bisley grip Ruger makes, the Colt Bisley grip sweeps further forward than the Ruger version of the Bisley Grip. This Bisley is chambered for 38-40, and although the recoil with Black Powder is not quite as stout as a 45 Colt, it is still substantial. This is how I hold this revolver. Again, notice the space between the trigger guard and my knuckle.
Cocking the Bisley Colt.
I completely understand your point of the 1860 Army grip, it is about 1/4" longer than the standard SAA grip, which is the same grip Colt was using for the 1851 Navy Cap & Ball revolver. But as I say, I shoot these revolvers all the time with heavy recoiling ammo, and my knuckle never gets whacked.