Seriously, seems like your 64s are round butt guns. Is that original or did you have a gunsmith R-B the grip frames? Gotta know. Best wishes and good shooting.
kaaskop49, all my 64's were round-butted from the factory, they're all dash-5's or 6's. I prefer the round butt configuration for ease of concealability, and the stocks fit my smallish hands better. I've also been known to get out the bench grinder to "improve" a square-butt K-frame to suit me better, such as the Model 15 shown at the top of the above photo. Purists cringe at such a thing, but all my guns are shooters, and this one has some cosmetic issues anyway. But it shoots like it's laser guided, even in my amateur mitts.
Today was a
wonderful day, I got in several hours of practice with a fellow officer who was feeling a bit rusty, and there were S&W revolvers all over the table.......M-25, M-29, M-24, M-625, and of course, my New Best Friend, the 64 that I converted to a 3-inch. (His new name is "Bob".

)
My buddy wasn't convinced anyone could shoot such a stubby little gun (with dinky fixed sights) as well as one with a longer tube, but the proof was in the shooting, and after the ruthless slaughter of hundreds of steel plates, even he had to grumpily admit that the Model 64 was every bit the shooter his nickle 24 was.
I love my autopistols, but I cut my teeth on revolvers, and to me, the K-frame S&W is about as good as it gets. Excellent triggers, perfect size, plenty sturdy without being "Ruger heavy", and accurate as the sun is bright. Many of my fellow officers grumble about being "undergunned" because we're limited to a 6-shot 38, but I like to remind them that
you're only undergunned if you miss. (Thank you Col. Cooper, I will never forget that!)
Shooting is a perishable skill, and I average about 75 range days a year. Lord knows I need it! But give me a couple M-64's to practice with, and it becomes a labor of love, fun times, and impressive results. If only reloading the ammo was as fun and easy as emptying it!