Ask Ian: Progressive Twist (Gain Twist) in Small Arms?

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From Jamie on Utreon:
"I know naval gatling guns like the 20mm CIWS uses gain twist rifling, but are or were there any commercial or military small arms that used gain twist rifling?"

Yes, there have been some significant uses of progressive (gain) twist rifling on military and civilian small arms. These include:

Colt percussion revolvers (1848, 1849, 1851, 1860, 1861 models)
Custom barrels for Sharps, Stevens, and other rifles by Harry Pope
Carcano Model 1891 rifles and carbines
S&W .460 XVR revolvers

There are certainly others, but those are some of the most significant.

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history development mccollum forgotten weapons design disassembly progressive gain gain twist progressive twist colt revolver percussion carcano m91 model 1891 1848 dragoon army navy pocket 1849 1851 1860 1861 pope harry pope barrel rifling rifled ciws xvd x frame 460 s&w