Yay! They're finally making it.

Discussion in 'Mossberg MVP Rifle General Discussion' started by spamassassin, Dec 2, 2016.

  1. spamassassin Well-Known Member

    Member Since:
    Aug 8, 2014
    Message Count:
    1,129
    Groc: thanks much bud.

    Well, I figured it all out. They sent me a barrel threaded for a .308 MVP. So, I pinged my local gunsmith who's actually retired and only takes the odd job for people he likes. I'd done him some favors so he was happy to recut my tenon. He profiled it down to 1" the whole way down and set it up to zero runout. He also trimmed .020 off of one of my scope rail screws as it was impinging on the barrel threads on the old barrel. A couple days and 100 bucks later and it's recut. My gunsmith had shown me that the barrel nut fitted just fine in a socket but didn't fit in his Snap-On box end wrench. Hmmm.... Last night I slapped it all together. Set it up for zero headspace and realized I didn't have a wrench to tighten down the nut. So I ran to O'Reilly and bought a 1 1/16" box end wrench hoping it'd fit without modification. It did. Then I couldn't find my damned hammer so I grabbed an old shot out 7mag barrel and gave the wrench on barrel nut a swat with the big end.

    Then I turned toward the muzzle. The flash hider I'd bought wouldn't clock properly without a crush washer. So I grabbed the one I'd found a few days back and put it on. It clocked just right. Dropped it in the stock and snugged everything up. Dropped my Vortex Gen II Razor 3-18 on it and put on the bore collimator. Dialed to my old zero and what do you know... My zero hasn't changed. At least the bore sighted zero.

    Pics:

    [IMG]


    better view of the flash hider. No real use for it but to look cool. No chance of flash on this 26" monster.
    [IMG]
    wood chucker likes this.
  2. GrocMax Active Member

    Member Since:
    Jun 12, 2014
    Message Count:
    166
    Hey Spassashizzin-

    (did I say that right?)

    People are already getting reamers made to wildcat the 22 Nosler into 20 and 6mm versions. 22 Nosler or 22 Nosler based wildcat might be an option for the 5.56 MVP, its basically a 6.8SPC necked down to 22 with a .378" rebated rim, using AR 6.8SPC mags. Holds considerably more powder than a 223, like 2-3g short of a 6BR, like a PPC+. If you're single loading anyways, a few hundred more FPS might help.

    A 20 Nosler shooting a 55g Berger at 3600 would kick ass.
  3. spamassassin Well-Known Member

    Member Since:
    Aug 8, 2014
    Message Count:
    1,129
    Yeah, I saw the 6-6.8 and .22-6.8 chamberings available at Black Hole Weaponry. I'm seriously considering picking up a barrel in one of the 6mm barrel cooker calibers but right now I'm looking at 6XC so my coach and I can shoot the same load and share ballistics. He and I just finished building his gun (6xc, savage large ring, Canjar single set trigger, custom wood stock, US Optics SN-3 3.8-22x44, Shilen Match 26" chrome moly barrel) last week and took it to a mini-match this weekend along with my rebarreled .223 MVP.

    My gun needed broken in, zero'd and velocity data gathered for all of my existing match load specs along with the scope ring eccentrics being set correctly. I didn't spend any time shooting groups as such but it would routinely stack bullets at 200 so it's looking promising. I got 2950 from my 75grain load as expected and all the other load specs came out with anticipated velocities. Zero shift between loads is around 2MOA max which is helpful.

    Pic time:
    [IMG]
    My bag (r) and coaches (f). He also carries a small backpack with our hydration bladders, food and ammo.


    [IMG]
    Coach (l) SA (m) and TheDiscoTripper (r). Teamwork starts with having a good team.


    [IMG]
    Left: Savage 110 large ring in 6xc w/ single shot sled, shilen match barrel 26" 1:8, Canjar single set trigger, Harris UltraLite notched swiveling bipod, US Optics SN-3 3.8-22x44 35mm main tube, Mark Pharr built stock. Shoots 115gn DTAC's at 2860fps.
    Right: Mossberg MVP .223rem, Black Hole Weaponry 26" 1:7, Timney trigger, Harris swiveling smooth leg bipod, Vortex Razor Gen II 3-18x50mm, PTG barrel nut, LSS chassis, MOE butt, DPMS PSG-1 grip, 20rd P-mag, A2 birdcage flash hider.


    [IMG]
    And a little side boob.

    We got all the optics set up and velocities checked and then ponied up to the 1000yrd line. Coach made a first round hit cold bore with his and I missed 4MOA wide on mine and picked up a hit on my 2nd shot. There was no wind at the firing position but apparently there was about 6-7mph worth of it for the bulk of the rest of the distance. Then we gathered data from 1000 down to 600. Everything up to 600yrds is a pretty easy hit with either gun. After that things always get touch and go but coach's 6XC really bucks the snot out of the wind. My .223 does; most certainly, not.

    After all was said and done I've got 60 rounds through my barrel and coach has about 150 through his. I've got 300 more cases to fire form to my chamber. Coach has about 50 more.

    Best of all, my pressures went down. This is attributable to the non-engraving rifling and general slickness of the BHW barrel. I've seen this behaviour before in my other BHW barrels. I've got back to rounded primers, no more flattening or cratering or mushrooming. I'm now considering adding another grain or two of powder and seeing if I can't touch 3100fps with 75's before the primers flatten. Extraction on this new barrel is super slick unlike the factory barrel. My old barrel had primers very flat, usually mushroomed with pronounced cratering. Kinda surprised I never broke a firing pin or ejector. Headed out now to take some pics that'll make you all question your rifles though. I'll have photographic evidence soon but the gist is, my new barrel would chamber an empty case or loaded one right to the web of the case. The old one left over 1/8" of the case completely outside the chamber. The chamber was cut shallow, like super shallow. I was wondering why the case head seps I'd seen and that had started were so high up the case, well that's why. I would recommend everyone get a go/no-go gauge set and check their rifle.
    Keith and wood chucker like this.

Share This Page