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My Mcgowan pre fit is chambered SAMI spec and a 140 amax touches the lands at an OAL of 3.140, here it is loaded at 3.135
http://i155.photobucket.com/albums/s...pscmdhoj9d.jpg
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i think if you had a center feed short action you could make it work! my center feed SA magazine is 3.1" and i didnt even notch it
I just measured the blind .308 mag box that I ordered for a 110c intermediate action. OAL 2.890" I have since gone with an AICS style XLR chassis and with the alpha 10 round mag, the max OAL measures 2.920"
Best bet would be a long action for your needs.
No shortage of $225-ish long action flat backs at the pawn shops around here, though I understand you wanting to use an action you already have. Doubt you could shoot the high BC bullets with that mag length though.