I recently aquired 2 S&W M-29-2 revolvers both have pinned barrels and recessed cylinder chambers. Today I chronographed them along with a Ruger Redhawk
Both of the S&W revolver have 6 1/2" barrels and the Redhawk has a 5 1/2" barrel. The ammo used fro testing was the Winchester 240 grain Jackted Soft Point
The S&W with the wood grips Chrono'ed 1323 FPS
The S&W with the Hogue grips Chrono'ed 1460 FPS
The Redhawk chrono'ed ---------------- 1380 FPS
The S&W Revolvers
My curiosity got the beter of me and I began to search for the reason why one of the S&W revolvers was 137 FPS faster than the other one. First I opend the cylinders and looked at the forcing cone in each revolver and VIOLA there it was plan as day the forcing cone in the S&W with the wood grips was approximately 2 1/2 times deeper than the one with the Hogue grips.
The large forcing cone (the wood gripped one) the slower one
The smaller forcing cone (the Hogue gripped one) the faster one
The only way to know the velocity of ANY firearm is to chronograph it. There is no other way.