458 SOCOM feed issues I think

[GUN DOG]

Here are the mags and dummy rounds. In all mags the issue is the same. If the steps 2 rounds in the mag they both feed fine and eject. Put more than 2 rounds they jam before being chambered. All bullet profiles work the same. The 405 flat point catches the feed ramp. The round jams between the chamber and bolt carrier. Drop the mag pull the bolt back lower the rifle and the round falls in the chamber.
See next post for jam pics

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[GUN DOG]

Any ideas I think it may be a mag issue but I've never had this issue before

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[Defcon Shooter]

https://shopwilsoncombat.com/AR-Sty...olymer-Lancer-L5-AWM/productinfo/TR-458LMAG7/

 

[GUN DOG]

May give them a try 2 of the mags I used were supposed to feed 458 SOCOM reliably according to the manufacturer

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[doctorjj]

Use Lancers. Problem solved.

 

[Okie4570]

I did these mods on some cheap mags and it worked. I used a dremel tool and not sandpaper.

 

[D. Hargrove]

Vid is spot on, only addition I made over the years was to sand the follower flat.

 

[GUN DOG]

One on right has been worked on left is stock. Ran all the dummies no problem haven't run the big flat points yet I didn't have any dummies to try but I'll take them to the range and see if they cycle. Thanks for the tip next some GI mags

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[Hawkeye22917]

So about a year ago I purchased my .458 SOCOM believing I had no use for a 5.56 or .308 AR. I guess go big or go home, but when I bought it I also purchased forty rounds of SBR rounds which were flat nosed copper plated. These rounds fed perfectly through non modified GI mags. So I went to reload my own rounds and I bought Berry’s bullets flat nose and starline brass. Now the rounds hardly feed if they do they get hung up in the chamber not fully closing the bolt and also scar my brass terribly. I believe I did everything I could modified the front of the mags, crimped the rounds and opened up the arms on the mags. It seems I can sometimes get a round to fully chamber but when the bolt tries to pick up the next round it hangs up with the empty jammed in the ejection port or doesn’t fully chamber.

 

[dlbleak]

So about a year ago I purchased my .458 SOCOM believing I had no use for a 5.56 or .308 AR. I guess go big or go home, but when I bought it I also purchased forty rounds of SBR rounds which were flat nosed copper plated. These rounds fed perfectly through non modified GI mags. So I went to reload my own rounds and I bought Berry’s bullets flat nose and starline brass. Now the rounds hardly feed if they do they get hung up in the chamber not fully closing the bolt and also scar my brass terribly. I believe I did everything I could modified the front of the mags, crimped the rounds and opened up the arms on the mags. It seems I can sometimes get a round to fully chamber but when the bolt tries to pick up the next round it hangs up with the empty jammed in the ejection port or doesn’t fully chamber.

Welcome Hawkeye, did you size before you loaded the new brass?