Quarterbore's Forums - M1S Barrel - MK 220 Cartridge Length

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Scouter

02-24-2010 10:35 PM

M1S Barrel - MK 220 Cartridge Length

I just got a new M1S upper and started developing a subsonic load.
The first item I check is proper COL using a dummy round with a MK 220 bullet. I'm getting land interference at 2.273". So, 2.260" COL should be OK. Anyone have a recommended COL for the MK 220 in a M1S barrel?
Thanks.

N310toN170

03-01-2010 03:31 PM

Try to stay between 2.250-2.260, the primary concern here isn't land engagement but reliable magazine feed.

pomofo

03-11-2010 03:50 PM

Check with 2.260 just to make sure. My M1S throat is so tight that I had to load down to around 2.160.

Colohunter

03-12-2010 01:42 AM

I don't have my info to check my load length right now, but I had to load short for my M1S uppers as well.

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