The S and W Model 66-8 typically features a frame size of K-frame, which is designed for medium-sized revolvers. The K-frame is known for its balance and versatility, making it suitable for both target shooting and personal defense.
K
K frame
S & W MOD 65 IS A STAINLESS K FRAME SAME AS MOD 10 AND 19 ETC
A "J" frame handgun refers to the Smith & Wesson small frame revolvers such as the model 36 and to any other handguns of that size (Taurus, for example, has a virtually identical revolver) which are build on the J size frame. S&W makes K, L, N, and X frame revolvers In ascending order of size.
Medium
The S&W Model 64 is the Stainless Steel version of the "blued finished" Carbon Steel S&W Model 10 .38 special. Both revolvers are "K" frames. There are 5 frame sizes in the S&W revolver line up. The "J" frames are the smallest. The "K" frames are the medium service size. The "L" frame are a beefed up frame version of the "K" with a full barrel length ejector shroud. The "N" frame used to be S&W largest revolver frame. The "N" frame supports .357 Magnum, .41 Magnum, .44/40, .44 Special, .44 Magnum,and .45 Long Colt. The "X" Frame supports .460 S&W Magnum, and .500 S&W Magnum. Hope this helps with your question about S&W revolver frames.
I don't know about the size difference but, the early 50's chev truck frame is straight from front to back. The 80's frame drops several inches between the front and rear axle.
N frame S&W Model number.
Charter Undercover .38 Special is equivalwent to the S&W J frame size.
Blued J frame vs Stainless Steel L frame J frame holds 5 L frame can hold 6 or more
No "current frame" will accomodate a '28 body without fabrication and modifications. The Chevy S series truck frames are popular for classic hot rods, they are about the right size and more than strong enough.
All Winchester model 12's are take-down designs. Winchester made a model 25 which is solid frame and very similar to the model 12.