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Gunsmithing DB10 .308 feeding issues

madpat

Private
Minuteman
Nov 3, 2017
75
8
Hi,

I have a big problem with my brand new DB10 18" SS. During feeding my DB something (feed ramps?) are scrateches my bullets. Does anybody know how to fix it?
It's brand new rifle before break in. I want to use it for long range shooting to 900y.
 

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Yesterday I took a good look at it, and there was indeed a couple of sharp/rough machine edges on the inside of each ramp that was causing this. I did some manual sanding using a little 400 and a lot of 1000 & 2000 grit, and a good 80-90% of these marks are gone. Took it out today and it still cycles perfect (never had an issue with that).