Riomouse911
Member
The Carcano thread got me to thinking, and I figured I would pose this question to those much more in the know than I about rifling/spin stabilization, twist rates, etc.
My Q is: With gain-twist rifling basically accelerating the spin of a bullet on its axis as it travels down the bore, does the bullet continue to increase in RPM as it travels downrange away from the rifle at the same rate as it did in the bore, or does it immediately reach it's "maximum spin zenith" at the muzzle and then start to slow down as centrifugal forces and drag begin to work on the bullet as it flies towards the target?
A secondary Q: what is the purpose of gain-twist rifling in standard velocity rounds? I can see it in a 4000 fps round possibly reducing deformation as the bullet slams into the lands and grooves and they work on the jacket material of the bullet, or in the .460 S&W with the sppeds and forces encountered there, but in a sedate rifle round like the 6.5 and 7.35 Carcano I just don't see the benefits. (I can't recall which caliber was said to have the gain-twist rifling.)
Just a wonderin' on a Sunday eve.
Stay safe!
My Q is: With gain-twist rifling basically accelerating the spin of a bullet on its axis as it travels down the bore, does the bullet continue to increase in RPM as it travels downrange away from the rifle at the same rate as it did in the bore, or does it immediately reach it's "maximum spin zenith" at the muzzle and then start to slow down as centrifugal forces and drag begin to work on the bullet as it flies towards the target?
A secondary Q: what is the purpose of gain-twist rifling in standard velocity rounds? I can see it in a 4000 fps round possibly reducing deformation as the bullet slams into the lands and grooves and they work on the jacket material of the bullet, or in the .460 S&W with the sppeds and forces encountered there, but in a sedate rifle round like the 6.5 and 7.35 Carcano I just don't see the benefits. (I can't recall which caliber was said to have the gain-twist rifling.)
Just a wonderin' on a Sunday eve.
Stay safe!