400FUW
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Thread: 400FUW

  1. #1
    gunco irregular moleman's Avatar
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    Default 400FUW

    Usually try to do a gun project after every deer season and this past year it was another ar15 upper that would be legal to hunt with in the Limited Zone in Southern Michigan that restricts you to straight walled cartridges with a case 1.16"-1.8" and at least .35". Used a Green Mountain 40 blank, 800 series high pressure round lugged bolt/extension for .473" case head. Buddy on another site was interested and offered to order a chamber reamer since I was rebuilding the gear box and apron on my lathe. Center gear with the bronze bushing in it shows how worn some of the gears were, v/s the new ones on either side of it. About the time I'd made all the gears and tracked down the correct bearings the chamber reamer was done. Went with a 16.5" barrel since I'll likely be hunting with a suppressor and long barrels and a suppressor suck in a treestand. Was unable to find a 11/16-24 silencerco muzzlebrake anywhere. So after a month on back order I just made one out of a piece of barrel scrap. A few months later the back ordered one did finally show up so I've got one ready for the next barrel.
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    350 Legend, imitation is the highest form of flattery. Aww, Thanks Winchester!

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    gunco irregular moleman's Avatar
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    Shot it unparkerized for a few months before taking it apart and finishing it. Made a sizer die to size the expanded and cut off 30-06 cases. The main bullets I've been shooting out of it have been .400" 200gr XTP's, barnes 195gr MZ, Hornady 200gr SST, the last two being muzzleloader bullets of the correct dia and designed for the correct speed range of 2300-2600 fps muzzle velocity depending on action and barrel length. This first barrel was for an ar15, and I am limiting the chamber pressure to 55Kpsi even though the bolt/extension is rated to 65Kpsi. Currently I'm turning a bolt action barrel for my buddy and up next a LR308 barrel for me. Since the case has a gentle taper, if you remove the decapping stem and raise the die up it will function as a taper crimp die. I believe I'll be hunting with the Barnes 195gr bullets this year in this upper even though a solid copper bullet is long for it's weight resulting in slower velocity from reduced case volume. When shot into the water at a mild 47,506 PSI load the magnetospeed recorded a speed of 2391 FPS.
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    Last edited by moleman; 08-30-2020 at 08:51 PM.
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    350 Legend, imitation is the highest form of flattery. Aww, Thanks Winchester!

  3. #3
    3/297th Inf Retired AARNG Akfite's Avatar
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    impressive for sure great job
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  5. #4
    gunco irregular moleman's Avatar
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    Thanks, Usually try to do a late winter project to pass the time. Usually will deer Hunt with them, then put them in the rotation.

    Some of the loaded rounds, 195 Barnes (the pointer ones) and 200gr XTP's
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    350 Legend, imitation is the highest form of flattery. Aww, Thanks Winchester!

  6. #5
    Gunco Maniac Tommo's Avatar
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    Moleman you are a genius!

  7. #6
    gunco irregular moleman's Avatar
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    Glad you like it Tommo, forgot to add a pic of one of the 195 barnes shot into water at 1770 fps which would be somewhere around 180yds for a max load in the 16" barrel going off of chrony readings, or 210yds for the 22" barrel if QuickLoad is close. 22" Ruger barrel almost done, just needs the area in front of the muzzle threads removed, crowned and parkerized.
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    350 Legend, imitation is the highest form of flattery. Aww, Thanks Winchester!

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