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Thread: Mossberg 100 ATR 7mm-08 rebuild

  1. #1
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    lar45's Avatar
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    Mossberg 100 ATR 7mm-08 rebuild

    Several years back my youngest son and I went to a church trap shoot and won a new Mossberg 100 ATR 7mm-08. It was the Bantam model with 20" barrel. A couple months later we had a shop fire and the plastic stock melted all over it.


    Being a hoarder, I couldn't just throw it away, so I set it in the corner and forgot about it. A couple of months ago I was needing a new project to work on, so I pulled it out. The stock was melted to the action and the action bolts were not visible at all. So I took a hammer and chisel to the stock and cut it off in chunks. Once the stock was out of the way I started scrubbing with steel wool and Ed's Red. The bore took quite some time to get all of the fire fumes scrubbed out.
    I contacted Mossberg, but they didn't have any 100 ATR stocks. Boyds on the other hand will build pretty much anything you want. I ordered their Classic in Forest Camo Laminate.



    The stock was an almost perfect fit. The barrel rubbed a little on the left side and caused some horizontal stringing. I took a half round file to the barrel channel and relieved it some until a dollar bill would slide freely.





    The only 7mm bullets I could find were some Hornady 154gn SSTs at Gander Mtn. I found Lee dies at Midway.
    I took some LC 7.62 brass and ran into the sizer die, trimmed, deburred and I was about ready to load.
    Hodgdon's site showed some wonderful velocities with Win StaBALL 6.5. I reduced the charge by 15% and worked up to 1 gn below max with no pressure signs. I seated the bullets .010" off the lands to start with and got a .775" group. I tried .005" and it opened way up to 2.28", so I went back to .010". The previous group resulted in one leaking primer, so I backed off .5gn and shot the following target which gave .418"



    I think I'll hunt with it this year and then pass it down to a grand child.

  2. #2
    Boolit Master 358429's Avatar
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    Very cool choice for the wood rifle stock.

    Sent from my SM-G930T using Tapatalk

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check