Barrel Twist Rates ( curious / wanting to learn more / get better understanding )

[jdanvers]

Generally speaking . . . . if there is such a thing in this airgun world.

Slower twist rates (higher number) is better for pellets
Faster twist rates (lower number) is better for slugs

^^ basically - kinda / sorta??

I have an RTI Prophet Performance with the .22 LR barrel which has a 1:32 twist rate and the thing is in fact awesome with pellets.

Tofazfou ( Love this guys video's and I have seen his name before - wish I could remember that now ) recently posted a video where he's smoking critters with a barrel using a 1:26 twist rate. He's slinging slugs and is getting wickedly good accuracy and performance out of it. That seems to be kind of a slow twist rate - yes? ( "typical" barrels being 1:17, 1:16, ,'ish . . . . )

Again - just curious and trying to gain better understanding / learn more.

Thanks guys . . .

-=- jd -=-

 

[Emu]

That ifo is absolutely useful to me in order to gain excuses for missing shots !!!

 

[dizzums]

id say with the typical airgun barrel, the bore and crown condition, as well as bore sizing is playing a bigger role in a given barrels accuracy than twist rate .. not that every i shouldnt be dotted and t crossed with accuracy, but giving more credence to twist rate is probably a losing battle ..

 

[Jasonmc]

I watch a lot of Tofazfou videos... on one video he builds what he calls his (I think that what he calls it...its been a while since I've seen that video) 17 HM AIR...
He says hes using a 17 firearm barrel.. I believe he slugged his barrel (all his barrels) and cast his own projectile..
In the past you had to reall work hard to get a decent power level our of a PCP to even consider machining a firearm barrel to work with air...unless it was a career or air force rifle . those things were monsters for the time (still are) with today's airguns and the power they push I believe its possible to use a firearm barrel and cast your own projectile and have one heck of a slugger..

 

[Motorhead]

At any given caliber ... Pellet LENGTH and Speed it can be shot at will require or lets just say, have a sweet spot in differing twist rate barrels.
It is a gyroscopic stability issue due in part too a pellets forward speed Degrading over distance a LOT faster that the RPM degrading over the same distance.

A more recent trend in .177 competition circles of FT & BR is shooting the heavier and end result Longer pellets such as JSB Monsters and Beasts ( 13.4 grain or heavier ) are finding SLOW TWIST barrels extend the range one can shoot before the pellet spirals due to gyroscopic instability.
* That being the RPM is too high for the speed the pellet is at down range. Slower twist rate in this SUB SONIC speed range simply keeps the pellets a tad more stable.

Tho in the Firearm world of Supersonic ( Most firearms ) As you shoot Longer projectiles a FASTER twist rate is generally required.

Now above is just a quick and dirty explanation and in no way the complete story ! This chase for what data learned previous and what modern advancements in Air weaponry is still trying to figure out is .... It's NOT figured out yet ???

JMO ...

 

[jdanvers]

Thanks guys. I do like the "Damn!!! I think I missed that shot due to the wrong twist rate of this friggin' barrel ...!! " excuse though.