mtnGhost

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    mtnGhost
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    Centercut

    Nice group.  Good shooting.  Did you measure that group? Looks like those first 5 were inside an inch…

    Thanks man. I didn't measure it, but I'm positive that those couple of flyers (that weren't attributed to me) were due to problems that I started having with my trigger mechanism and sear engagement. Hard to explain without photos, but out of the blue – my second stage adjustment screw had come loose during my hunting trip the week prior. I thought I had it all fixed, but I noticed that every 5th or 6th shot was real mushy, so like you can kind of hear in shot #8 in that video – the sear was "riding" the hammer longer than usual, causing just enough of a problem to me reduce the hammer force – turning respectable groups into 💩 

    I still need to tweak that trigger to get it back exactly where it was before, maybe even using epoxy instead of Loctite to keep it there forever 😂 

    Redick

    Helluva shooting 👏🏾👏🏾👏🏾 you have a certified head knocker! I did notice a nice twang from shot to shot as well. Awesome tune and slug combination shoot safe Geoff 

    Yeah, there was definitely some twang there! I do like how recording with 240 frames per second picks up things that I might not hear otherwise. There's always been some ping with this Matador that overrides hammer / spring noises, but it's kind of cool being able to use slow motion audio to hear little tuning problems like that.

    Even so, untuned – this thing is still backyard friendly on the rapport side and  gets a considerable amount of shots per fill. The downside, the energy is anything but backyard friendly (especially anything above 60 grains, which sound like a 9mm parabellum on impact 😬

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    Glem.Chally

    https://www.answers.com/Q/What_is_the_delta_in_a_wolf_pack

    Thats a shame,  too late to change the name?

    🔥

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    mtnGhost
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    Glem.Chally

    Lou must have misread, im sure hes shooting these in .25.  He sent me some.

     

    Yep, Lou is awesome! He had sent me some too..


    I just haven't throated any barrels to seat them properly

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    mtnGhost
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    My 22 cal slug gun builds have had minute of angle accuracy out to at least ~225y with 30gr ammo; some have been closer to 250y when I tested off of my little Caldwell Stinger. The heavier the projectile, the better BC and "reach". On the other hand, my .25's have had minute of angle accuracy to 300y with 38.5gr and 43.5gr Nielsen's. 

    If you have enough muscle to push 36+ grain 22 cal ammo out of a barrel that likes them, then you'd be pleasantly surprised at the results!

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    Yeah, o-rings conforming and/or valve poppets doing the same dance.

    • This reply was modified 1 day ago by mtnGhost.
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    mtnGhost
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    NX8 1-8 @19.2oz in rings is my lightest setup for hunting. No fumbling with parallax adjustments.

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    jwrabbit123

    These are my tunes for accuracy with best weights I found so far

    54fpe Taipan veteran std 52fpe 34 gr

    69fpe edgun r5m long 36 gr

    145.8fpe airforce 67 gr

    Those 67's were .25 cal right?

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    mtnGhost
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    Thanks for all of the replies! I'm building a fairly unique web-based power tuning calculator, and I've had the idea of using info like this as reference points in a table when it calculates the energy. There's some good formulas out there on PCP efficiency, but I'm going to publish something that can accept CSV file input, where you can upload 2 or more recorded shot strings for different tunes, and it'll graph them –  but more interesting to me is the math associated with both efficiency and max power potential,  and coding some knobs / sliders that you can manipulate to visualize predicted power output and shot counts (using the CSV data as historical reference with some clever math). 

    It'll be a little while before I finish it, but I'll share the link for anyone to use 😎

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    Veerkracht

    Very nice work!

    You know your way with the lathe.

    Impressive fpe.

     

    Regards, Robert.

     

    Thank you! The valves take a lot of time on a manual lathe, but CNC is the next step in a couple of weeks. 

    This is one below gave me another increase in velocity, pushing 28.5gr NSAs at 992FPS with the 600mm FX barrel for 62FPE:

    The spread and deviation is real tight, and I couldn't be happier! I went out today to test at paper, and stress test the valve a bit. When I got down there, the wind was blowing ice / hail sideways 😬 .. 37F, very wet the wind at 50-60+ MPH all day long (we're having a nasty Pacific storm here in Washington state today). I didn't want to drive out there for nothing, so I nailed a target at 100m and shot some groups anyway 😆. 

    Even with this wind, once I got zeroed – I was shooting 2" groups with the 28.5gr NSAs (tuned for 980FPS). My hands were frozen after the first fill, I left the HST where it was and loaded a mag of 24.8gr NSAs, but they weren't grouping as tight. I refilled again, looked in my ammo box, and chose to load some of the FX Hybrid slugs for fun. Waited for a break in the ice storm so I could get out my LabRadar again. Decided to dial HST back 1/2 turn for air conservation, and they registered at 1040FPS.    I had to hold a lot more to the left, but keeping the same POA – they also shot 2" in the crazy wind!!! 

    Now I'm dying for my next opportunity to get back out there. I wouldn't normally shoot anything but .30 cal in weather like that, and to see a .217 perform like that is 💪💪💪

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    Dude, if there was an award here for rifle stocks – I think you'd take at least 3 of the top 5! Very nice indeed 👍

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    mtnGhost
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    Length

    I had a couple people ask me how long my Veteran is. In the primary configuration with the 600mm barrel with two plenum extensions, it measures out to:

    Without Taipan moderator screwed on: 31"

    With Taipan moderator screwed on: 34.4"

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    I've built several flat shooting small bore (22 / 25 / 30 caliber) PCPs for slugs. If you're serious about accuracy, start with identifying the barrel that will work for your caliber and overall requirements. Slugs are not nearly as forgiving as pellets IMO, and if you wind up with a bad barrel that you can't replace, game over.

     

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    mtnGhost
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    My PCPs under 7 with optics are:

    • Leshiy / 350mm .25 / Akula moderator + Dedal: 4.8lbs
    • Taipan Mutant Shorty + Burris FF III: 6.2lbs
    • This reply was modified 6 days ago by mtnGhost.
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    mtnGhost
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    How long is the barrel in that rifle?

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    SniperX

    Can you please share how you secured the valve stem to the Ketron plastic?  Is it an interference fit, or epoxy?  

    The forces involved are high so Im just curious whats involved in keeping the stem from slipping or coming out. 

    Thanks for the great post!

    The pin that I'm testing right now is just pressed fit. When I'm confident in the overall design, I'll add a little Loctite 680 for added security. Given the properties of this PEEK and titanium, I would not doubt that the press fit would last forever 😆 

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    I want to thank everyone for the positive feedback! Everyone except @edosan, who is always taking credit for everyone else's work .. (kidding of course! 👊🤣 ). I should probably thank Derrick as well for enduring my text messages during this build, while I worked through some if the ideas 😆 

    Anyways, it's been a fun journey building parts for this rig, and unbelievably rewarding to see the end results as they are. The form factor of this rifle is right up my alley, and like I mentioned to another member last night – I never expected to match the power output of the MKII that I built last fall, but low and behold I have indeed put it on that playing field. 

    I'm planning to do a small production run of parts soon, so just contact me if interested so I can get an idea how many kits to produce.

    @motorhead – thank you sir! And UGH, Photobucket about ruined the internet with their frigging monetization scheme! I can't count the times that I've cursed them trying to find photos as I have searched for things, where the only photos were hosted by them (and long gone)! LOL

    I know exactly what you mean about the atmospheric breather port. I'm not quite sure how many extra CC's that one can squeeze out if it by spacing it out, but I'm just very happy that Mr. Rowe had produced the 20cc drop-in extensions so I didn't have to do much with the plenum chamber. I also have a pristine little Mutant sitting here as well with a perfect CZ barrel..

    I love it as it sits! A very "civil" and pleasant shooter… but I really have to hold back from going all out and super-turbocharging it 😂

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    Loving the reticle options! Quick question – aside from diopter adjustment, do the eyepieces remain stationary when the magnification knob is turned? Reason I ask – I run an eyepiece-mounted NV unit, and the rotation is a huge headache with my 7-35 and 1-8 ATACRs, so I can only use it with my 4-32 and 1-8 NX8s 👎

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    mtnGhost
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    Beautiful score!!!

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    mtnGhost
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    Nice! .257?

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    mtnGhost
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    Double KooL Joe! 😎👍😎👍

Viewing 20 posts - 1 through 20 (of 1,825 total)