I got mine on Friday and put it on my 300 PRC and shot 10 rounds down it. I run Lone Peak on my competition rifles. They're both smooth as butter. Go with the Kelbly you want the trigger hanger and mechanical ejector.
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Kelby's Prometheus Action
- Thread starter B4Maz
- Start date
Well I've ran it in 2 nrl hunter matches and a PRS match , with nf elr up next. Since I've got about 2500 rounds through it, it's definitely more broken in now and it's just slick. The ejector on the damn thing is rediculous. If I'm running it as hard as possible it will huck a prc case 15'+
I will probably be getting another one in long action, although there's a serious lead time on these things now talking to Ian a couple weeks ago.
Still kinda stoked my serial number is #007 haha
Let me know if there's anything else you want to know specifically,
Well I've ran it in 2 nrl hunter matches and a PRS match , with nf elr up next. Since I've got about 2500 rounds through it, it's definitely more broken in now and it's just slick. The ejector on the damn thing is rediculous. If I'm running it as hard as possible it will huck a prc case 15'+
I will probably be getting another one in long action, although there's a serious lead time on these things now talking to Ian a couple weeks ago.
Still kinda stoked my serial number is #007 haha
Let me know if there's anything else you want to know specifically,
That's what I was hoping to hear.... What trigger you running and have you played with the trigger timing at all with the hanger?
No, it's cock on open so the bolt close in our heavy guns is honestly nothing.
I run a trigger tech diamond, but the trigger hanger is nice in that I have a spare setup and when my trigger went down in a match I was able to swap it out painlessly. I know you can get different offsets from kelbly to adjust it, but it's been good enough and don't know any better.
Ran my Prometheus at the Nightforce ELR this weekend. No issues at all except me not running the bolt back all the way and brass dropping back in the chamber. I've just been running short actions too long. The dust and grit from the match just lapped the bolt in a little.
I had no problems with mine either this weekend, ran like a top
Keeping with the Kelblys theme and not starting a new thread...
Does the Atlas Tactical have a Cock on Open/Closed or 50/50?
Does the Atlas Tactical have a Cock on Open/Closed or 50/50?
Pretty sure it's on open, because when I bring the bolt down it's almost on a spring and forces itself shut.... However scientific I'm trying to sound
Atlas tac is designed to be 100% cock on open. Depending on your Trigger choice, it will change how much or if its over cocking on bolt closure. You want 240k of pin fall minimum in rem700 clones. Different hanger, or shortening cocking piece can eliminate the cock on close.
The atlas has a great bolt throw. Cock on open only and very hard to bind.
I have a atlas tac and a fusion. Honestly cant decide wich i like better. Ive heard the atlas isnt the best choice for br based cases but it feeds 6.5cm so smooth i cant feel it pick up a round.
weird ive never heard that. I shoot 6br exclusively in my match rifles and no issues. on 2 sep atlas actions. I have all the conversion kits but MDT 12 rnd br mags are the best by a mile.
that being said I really want to switch to Prometheus for built in lug/rail.
going to order one today.
DT
Just what my gunsmith said. Hes all about lone peak so could just be steering me. Otherwise i dont have a single complaint about the atlas. Probably will use one for my 223ai build im getting ready to start
I think there was an “issue” at one point which is why they modified the ejector location from 90 degrees to 45. I believe it was just an improvement rather than fixing a real issue that affected all the actions.
I’ve had Atlas’, Nanook and Prometheus and love them. I also shot a Lone Peak in my comp rifle for two years. They’re all good.
I’ve had Atlas’, Nanook and Prometheus and love them. I also shot a Lone Peak in my comp rifle for two years. They’re all good.
Got mine after a year of waiting 
but its EU so its quite normal… #63 hope it will work it looks nice, tends to stick a bit when pulled all the way back but i still need to attach a 338/300nm barrels on it and actually fire something…
but its EU so its quite normal… #63 hope it will work it looks nice, tends to stick a bit when pulled all the way back but i still need to attach a 338/300nm barrels on it and actually fire something…
Technically no but kinda like a hybrid.
It's a push feed going forward for sure but upon extraction since there is no spring loaded plunger in the bolt face, the extractor keeps control of the spent case until it's mechanically ejected similar to a crf on the bolt stop.
Yeah only their new c-4 chassis is made to accommodate trigger hangers out of the box.
The Prometheus drops in just fine in the KRG Bravo chassis and in the MDT XRS with no modding needed. Yes, KRG calls the Bravo a chassis.
Any chassis will work. Mpa,MDT,JP,XLR,cadex. Stocks like foundation and manners I believe need to be ordered with slight material removed but that's easy just order for a specific action.
90-94gr of Rs-80 1gr int. 250atip and 300nm 28” lothar barrel
854-901 m/s with 93 starting to have light sticky bolt. 93 and 94 are the high ones out of the group.
84-88gr were one big hole but speeds were too low 830ish m/s but they fall in the same general space as on this pic the three lowest 90-92 loads.
Action after using it for a while with 338 barrel is smooth works like a charm. Im really happy with it. Next is match test in december in Poland to see how it does in sand…
Resurrecting this.
Any more recent input from anyone? I haven’t owned or used a Kelblys. Any reasons to avoid the Prometheus?
Any more recent input from anyone? I haven’t owned or used a Kelblys. Any reasons to avoid the Prometheus?
IM on year 3 of using the prometheus. Its everything the atlas shoulda been. one piece and slick. integral rail and lug.
I would and have put this action next to any other action out there and honestly only think one other action competes with it and thats the impact.
GL
I’m going on a year and 3 months on my Prometheus. Of the limited amount of custom actions I own, it’s the slickest. There’s smooth and there’s slick. It’s both. I found that the bolt lift is also lighter than Impact. At least comparing the two samples I have.. YMMV
I’ve had zero issues with mine as well.
I’ve had zero issues with mine as well.
I have 2 nanook (lighter versions ) actions one short action std bolt in 260 and another long action mag in 7mm prc. The short action runs ok ,the ejection is pretty goofy but usually ejects fine. The long action is another story it usually drops the spent case back in the action most of the time other then the last round. Gun went back to kelbly they they found gun would run good if you run it hard and don't have a scope with a windage knob on it lol they also replace the ejector and extractor on a rifle with like 50 rounds on it. The action has some good things going for them. I like the firing pin and the nanooks are so light and very reasonably priced but they are a no go in a magnum. I guess the take away is there is very proven ejection systems out there and Kelbly decided to reinvent the wheel. Im not sure it was an improvement.
I am sorry to hear that you are still having issues with your ejection. If I remember correctly the one-piece mount or the scope you have, has an excessively large protrusion over the ejection port. This is causing the case to hit the obstruction and fall back into the action at times. We mounted a scope on it here (Vortex Razor Gen II, and also a Nightforce ATACR) with two-piece rings and the problem could not be replicated. We replaced the extractor and ejector to verify that everything on the action was functioning properly.
Have you tried a different mounting solution?
We build magnums all the time and have them all over the world without the same issue that you are seeing. Our most popular magnums right now are the 7mm PRC, .300 Norma, and .338 Lapua. All of them are running without issue.
The ejection angle is optimized to clear a spent or loaded case (large magnums) without impacting the action rails with an empty magazine. So, the ejection angle is upwards, and a large knob or one-piece mount can cause issues.
If you truly aren't happy with the action, please contact us and we can find a solution for you.
Currently on the market for a long action. Have never used Kelly’s and the Prometheus seems interesting. I guess my only worry would be getting used to the mechanical ejector, I know some people love it how much of a learning curve is it really?
I got used to it pretty quick. Just run the bolt normally and don’t try to be all cool guy running it super slow. One thing I don’t like is if someone is helping you on a stage being a brass monkey the brass is never kicked out far enough for them to easily grab.
I’m running an Atlas Tactical in 30 Nosler, great action and I’ve become somewhat of an addict to the mechanical ejector…I’m an retired benchrest guy (Kelbly’s been a staple in that world for decades), which makes me a brass whore…can’t stand them tossed in the dirt unless it’s a necessity. This ejector setup allows me to be easy or western with it.
I’m also running two piece rings with Razor LHT. Good luck and I wouldn’t hesitate…I have two Nanooks in the safe waiting for me to build something.
I recently had a 22br built on a nanook action since Kelbly is the only major action companies I have not played with.
I am very impressed so far with the smoothness of the action and the mechanical ejection. I have become a fan of mechanical ejectors due to being able to control the ejection strength. I like the light bolt lift and seems very difficult to bind.
My main match rifle is a lone peak fusion and as of now I still prefer the lone peak due to smoother and lighter bolt close. My nanook with box n Andy Tac sport x trigger has a decent hitch on bolt close and my lone peak is very smooth. This may get better with more rounds on the kelbly.
Last, my lone peak I’m running a MDT 1 piece scope mount currently and it will a few times a match drop brass back into the chamber on ejection. The mount has a lip that overhangs the ejection port and mine is all dinged up from brass hitting it. I dont think the kelbly ejection system is the problem, consider going to rings or beveling your 1 piece mount. I’m going back to rings, they actually showed up a couple days ago, just need to install them.
I am very impressed so far with the smoothness of the action and the mechanical ejection. I have become a fan of mechanical ejectors due to being able to control the ejection strength. I like the light bolt lift and seems very difficult to bind.
My main match rifle is a lone peak fusion and as of now I still prefer the lone peak due to smoother and lighter bolt close. My nanook with box n Andy Tac sport x trigger has a decent hitch on bolt close and my lone peak is very smooth. This may get better with more rounds on the kelbly.
Last, my lone peak I’m running a MDT 1 piece scope mount currently and it will a few times a match drop brass back into the chamber on ejection. The mount has a lip that overhangs the ejection port and mine is all dinged up from brass hitting it. I dont think the kelbly ejection system is the problem, consider going to rings or beveling your 1 piece mount. I’m going back to rings, they actually showed up a couple days ago, just need to install them.
I have also owned it now for a while. There is an ejection issue but only when going overpressure with fat round like 300nm - but that is hardly an action or design fault. On the other hand i find long handle great as it allows for greater leverage when opening “to be stuck case” and simply using rod to remove it. It also is great when cases get stuck due to sand issues (competition in Poland on the beach/sand terrain). Only other thing i noticed (again caused by my failure not actions) is when primer blew/flew out it remained in the action and when i loaded next round it fell into action screw hole and i was unable to dislodge it easily as bolt pinned it inside - unfortunate during the match (i think major cause is short mdt front screw which should be a mm longer - easy to remedy).
Other than that it works as a charm and ejection method with bolt stop is perfect one can easily control the ejection distance from basically 0 to the “ELR distance”…
Other than that it works as a charm and ejection method with bolt stop is perfect one can easily control the ejection distance from basically 0 to the “ELR distance”…
Two piece base high rings nf nxs 3.5-15 x50 It s not the scope. The problem as I talked to the guy in your office is the rounds in the mag are negatively impacting ejection. On the bench you can get the gun to run ok. Best I have seen is like kicking brass 12-18" out of the rifle for sure not next zip code. As the rounds move forward in the mag during recoil the ejection gets worse and ether just falls out if the gun or the ejection moves to 12 o clock hitting the scope and drops the round back in the action. So testing on the bench really doesn't duplicate the problem. I can also move the rounds anywhere in a short action .473 and it doesn't impact ejection at all. The larger diameter of the mag cause the empty case to be lifted by the unfired cases and rob the ejector of power or change ejection angle.
I shot some slow mo vid of the problems to see what was going on I will try to upload the videos.
If you have an action that is running great I could defiantly use some help. What bottom metal/mag system are you using? If you have a phone/ camera that can shoot slow mo it would help a ton to see an working action so I can get mine running better. Thanks
Hawkins Obendorf BDL with Wyatt’s mag and spring.
I don’t have the rifle right now as a buddy asked to borrow it, I’ll see what I can come up with when I get it back. Not sure I can get slowmo but should be able to get video.
I don’t have the rifle right now as a buddy asked to borrow it, I’ll see what I can come up with when I get it back. Not sure I can get slowmo but should be able to get video.
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I am going to re-revive this thread. Are their any big reasons to choose the Promethius over the Nanook aside from weight considerations? Reading the above thread it seems like both actions are well liked.
I am leaning towards a short action nanook as I would be building something on the lighter side possibly to shoot NRL hunter type matches with and/or for mule deer. I have a Impact 737 already as my main PRS match rifle.
I am leaning towards a short action nanook as I would be building something on the lighter side possibly to shoot NRL hunter type matches with and/or for mule deer. I have a Impact 737 already as my main PRS match rifle.
Unless your trying to make a light weight class the amount of ounces ain't going to e that big of a difference only of the action.
It seems like the Nanook is essentially a Prometheus with some cutouts for weight savings, and some other small nuances in design.
Here's a thread by Ian Kelbly introducing these two actions, he sums up their designs here:
