350 Legend magazine info

Stephen G

Stephen G

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Ive tried every 350 mag I could get my hands on. 3 best are
#1 15rd wilson
#2 10rd Duramag
#3 20rd CMMG
Duramag and CMMG come from same stampings. Only difference is Duramag uses a anti tilt follower and the spring is 1 coil over in their 10rd vs CMMG 20rd spring.
Wilson crammed a 30rd spring into a 20rd 300 blk out mag AND IT FREAKIN WORKS. No anti tilt follower. Can not decern any changes in mag body or feed lips over 300 blk out mag. Just big freaking spring. Hence 15 rd 350 in 300blk out magazine.
Im planning on some parts swaps to test function.
My hope is a anti tilt follower and cut down 30rd spring will get a reliable 20rd magazine in the CMMG body. If that works, Ill try to modify the wilson to get 5 more rounds in it.
 
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Dropping the front lip just a micron & sanding down/rounding inside of front lip will stop the cartridge case from hanging up /causing FTF.
 
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I have a 350leghump I haven't even tried to shoot yet.
Yeah I would dremel sander drum that front edge.
Worked for my 450 magazines and mini 30 mag would hold up there too.
I don't even remember whoes magazine I bought for my 350.
 
I just got a 450 Bushmaster Duramag for my 50 Beowolf. It has a half moon cut at the front. Same follower as the proper 50B mag. Anyway, the rounds snagged on the lip when I tried to feed them. I think the feed ramp in the lower would lift the bullet clear but I know for sure that this mag won't be the cause of a stoppage.

I used a Dremel sanding drum then Cratex wheel to bevel and smooth it. Didn't bother with polishing. Just enough to give the brass mouth a smooth jump. Rounds slip out slick as they can now.

I haven't shot it yet, still working on the build. I can stuff these rounds in a .223 mag but the mag needs to have an anti tilt follower, anything else binds up bad.. The Magpul I tried needed a little round over on some hump right at the front of the mag, 3 seconds of Dremel work. Does the 350 feed from a .223 mag?
 
Havent tried, they appear the same.
 
I know Wilson Combat took a Lancer 300 blk out mag and shoved a 30rd 556 mag spring in it. They work well. Got some springs, 1day Ill try it on a different magazine
 
From the various comments on the subject, it seems that most anti tilt follower mags will feed the fat rounds well. Tilting followers are troublesome. Spring swaps are next on the list to change but most problems solved by anti tilt.
 

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