Twist rate...

[Rodentman]

Long story short, I now have 2 replacement barrels for my stinking G17. The Storm Lake has a 1:16 twist and the Wheaton is 1:10. Is there any recommendation as to what weight bullet works best in each of those or doesn't it matter? Or is a function of charge, hot or mild?

[Seismic Sam]

The twist rate of the barrel is inversely proportional to the twist rate of your ratty knickers while shooting the gun. A high twist rate will stabilize the bullet nicely, producing good groups and shooting satisfaction. A low twist rate will allow the bullet to destabilize, yaw, and go into the target sideways, producing tightly bunched and knotted rat knickers with ratty traction marks inside. More seriously, you probably want to start googling twist rates for that caliber and see what comes back. IIRC, the higher weight bullets require a higher twist rate to get them to stabilize properly.

[BigDog58]

Sam is correct about the Twist rate. Faster Twist Rate's will stabilize heavier projectiles better. And vice-versa. However, at normal pistol distances, I don't think you'll see a lot of difference (I could be wrong). But if you start shooting that G17 at 100+ yards, you might see an effect on accuracy and bullet stability. If my memory is correct the Stock G-17 barrel is around a 1 in 9.75 TR. It is also a Hexagonal Rifling.

With the Stock Barrel, I've loaded and shot 115gr thru 147gr and not seen any differences out to 50 yards. This held true for both copper plated and fmj projectiles . YMMV

[Rip Van Winkle]

IIRC a 1911 uses a 16 twist. I can't imagine a 9mm needing much more than that. Unless you're shooting a 3" long bullet.

[UnaStamus]

Let's all step back for a minute and realize that we're debating twist rate for a Glock 17...

[ZardozCZ]

My AR is 1 in 7 and very much prefers 65gr plus. Slower velocities may not care so much. IDK.

[Seismic Sam]

Let's all step back for a minute and realize that we're debating twist rate for a Glock 17...

I disagree. This is all about including the subject of twist rate in posts having to do Rodentman's knickers - Who give a F**K about the Glock anyway??

[Rodentman]

I daresay there is a lot more interest in Glocks than in my knickers. At least there surely should be.