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7mm mashburn defiance anti

Run 300 win mag into full length die and then fireform. Pretty simple wildcat. Some good 300 win mag brass around too. Peterson and ADG
 
7mm Mashburn left. 7mm Remington right
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Did you try any 180s
I threw a load together that was shooting 180 bergers at 3/4" going 3100fps at the end of hunting season. I never did play with seating depth so I know it would easily tighten up. I was running the regular magazine because the wyatts hadn't shown up yet.
 
Would sell as barreled action,trigger, and dies/ brass too if someone doesn't want the rest
 
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