PCP AirMaks Katran NL HP Unchoked

[Pumacarl]

AirMaks Katran NL HP 520mm Unchoked Barrel | Utah Airguns

AirMaks Katran NL HP 520mm Unchoked Barrel is a precision-machined unchoked barrel designed for maximum slug performance and superior long-range accuracy.

utahairguns.com

Is anybody running or testing this airgun out right now? I'd love to hear about it. I am intersted in the .25 version, more than the .22. (If I got a .22 it would probably be the 700mm barrel.) I'd like to have a .25 airgun that could easily do 34gr pellets at 875fps, and also accurately shoot 50gr Altaros slugs. If that is even possible on the same barrel twist.

 

[Florida_Man]

I wonder what the plenum size is on those.

 

[Solo1]

Well check my tipan thread

 

[Pumacarl]

Well check my tipan thread

I am done with bullpups, or I would. I like them, I just can't seem to shoot them as well anymore, offhand anyway.

 

[Pumacarl]

I wonder what the plenum size is on those.

I thought that I read somewhere that the plenum size is 60cc, but I am not certain of that. Actually, I am screwing up, I should just state any old number and then someone would correct me with the right answer pretty fast. lol

 

[pan60]

I am done with bullpups, or I would. I like them, I just can't seem to shoot them as well anymore, offhand anyway.

why is that are they just harder to holder on target the the longer guns?
i have never tried one but was thinking about getting one in the futer.
as unstable as i am maybe not LOL

 

[Pumacarl]

It is a combination of things, but yeah, stability, mine. I use to shoot them just fine. Between my different airguns, my mrod with the JSAR aluminum tube, is way out front for the best size/weight/shoot ability, and everything else is a compromise of some sort.

 

[Moose]

What is the purpose of a choked barrel for pellets and slugs? I'm familiar with chokes for shotguns. Wouldn't the restriction negate the rifling effect. Just trying to learn.

 

[Pumacarl]

Chokes, originally, made up for lousy manufacturing tolerances for both the barrel bore and the ammo. With todays quality barrels, and consistent pellets/slugs, chokes are less important than they use to be. To shoot slugs well you really need a pretty decent barrel, the tolerances are very tight, so the choke isn't needed and mostly not wanted. There has been many discussions and threads on this topic, if not here, then on AGN or GTA. Everybody has a different opinion on it, that has, or hasn't, gotten slugs to work in their guns.

 

[MCarter54]

AirMaks Katran NL HP 520mm Unchoked Barrel | Utah Airguns

AirMaks Katran NL HP 520mm Unchoked Barrel is a precision-machined unchoked barrel designed for maximum slug performance and superior long-range accuracy.

utahairguns.com

Is anybody running or testing this airgun out right now? I'd love to hear about it. I am intersted in the .25 version, more than the .22. (If I got a .22 it would probably be the 700mm barrel.) I'd like to have a .25 airgun that could easily do 34gr pellets at 875fps, and also accurately shoot 50gr Altaros slugs. If that is even possible on the same barrel twist.

Pumacarl, this specific airmaks-katran-nl-hp-520mm-unchoked-barrel in .25 only is shown with 520mm unchoked barrel. The NL HP acronyms stand for
'New Long' 'High Power' and is designed specifically for slugs. However, you can switch to something like JSB Diabolo Exact King Heavy MKII (33.95 Grains)
or H&N Baracuda (30.86 Grains). These pellets feature a harder lead alloy and tighter tolerances than standard JSB options, which helps their skirts better grip the unchoked rifling. If shooting slugs it looks to work best in the 33-50 grains area. Katran owners frequently note that the unchoked barrel performs best with slightly oversized .251 diameter slugs rather than standard .250 variations. The fractionally larger sizing creates a perfect air seal against the bore.

So, the real answer is Yes it can but a slight retune might be needed to get pellets in that 880-900 fps range.

 

[MCarter54]

I wonder what the plenum size is on those.

Florida_Man, The plenum size is 80cc in the Katran NL HP. It holds 110-200 psi.

 

[MCarter54]

What is the purpose of a choked barrel for pellets and slugs? I'm familiar with chokes for shotguns. Wouldn't the restriction negate the rifling effect. Just trying to learn.

Mr. Moose, choked barrel for pellets narrows slightly in diameter right near the muzzle. This slight squeeze grips, sizes, and stabilizes lead pellets just before they exit the gun, which helps smooth out minor manufacturing flaws and tightens up group accuracy. A choked barrel constricts a slug as it exits and can deform the projectile, reduces accuracy, and can dangerously increase pressure or damage the muzzle. Hope that makes sense. It does to me as I have a habit of thinking too logically and sometime miss the broader picture.

 

[FL22]

It does to me as I have a habit of thinking too logically and sometime miss the broader picture

Hopefully you won’t get offended by my pointing out that this thread’s post #9 was almost two years old.

 

[Guilty]

Pumacarl, this specific airmaks-katran-nl-hp-520mm-unchoked-barrel in .25 only is shown with 520mm unchoked barrel. The NL HP acronyms stand for
'New Long' 'High Power' and is designed specifically for slugs. However, you can switch to something like JSB Diabolo Exact King Heavy MKII (33.95 Grains)
or H&N Baracuda (30.86 Grains). These pellets feature a harder lead alloy and tighter tolerances than standard JSB options, which helps their skirts better grip the unchoked rifling. If shooting slugs it looks to work best in the 33-50 grains area. Katran owners frequently note that the unchoked barrel performs best with slightly oversized .251 diameter slugs rather than standard .250 variations. The fractionally larger sizing creates a perfect air seal against the bore.

So, the real answer is Yes it can but a slight retune might be needed to get pellets in that 880-900 fps range.

I have it in .22
Goes supersonic with the 520 barrel
I think it's a fantastic airgun

 

[pan60]

@Guilty
Welcome to HAM

 

[Guilty]

@Guilty
Welcome to HAM

Thank you!