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Posted: 8/11/2022 9:00:05 AM EDT
[#1]
I've been happy with the Hornady 190gr Sub-x. Never an issue, though I dont have an MCX. I just have a couple 8.5" pistols with pistol length gas and AGB's. Definitely not a 1 for comparison due to that, and I've run a few boxes of S&B 200's without issue. The majority of my subs I reload myself, but thats more about cost savings than anything.
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Posted: 8/11/2022 9:10:39 AM EDT
[#2]
Loading your own is the way to go.
Also a lot of good information in this thread 300 BLK Master thread Welcome to the site |
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Posted: 8/11/2022 9:39:51 AM EDT
[#3]
S&B 200gr is my choice because it has never given me an issue.
If it won't cycle that it needs work. Or maybe more break-in / lube |
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Posted: 8/11/2022 10:05:22 AM EDT
[#4]
I vote "break in/lube"
My friends 6.75" did the same thing when he first got his. If I remember correctly, we ran some supers through it (couple mags worth), then remoil'd the upper like crazy. Been fine ever since! |
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Posted: 8/11/2022 11:24:57 AM EDT
[#5]
Thanks! I can't believe how much info and responses this has gotten so quickly, I'm grateful for the community ??
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Posted: 8/11/2022 11:26:33 AM EDT
[#6]
Thanks! I can't believe how much info and responses this has gotten so quickly, I'm grateful for the community ??
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Posted: 8/11/2022 11:29:09 AM EDT
[#7]
It seems that the common theme here is to reload. I can't say I disagree but work + 2 kids under 2 has me stretched thin haha
Are there any reloaders that sell rounds to spec? I know that may sound crazy but if I fail to find what I need and don't have the time to reload myself, that sounds like an alternative |
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Posted: 8/11/2022 11:30:29 AM EDT
[#8]
Hadn't thought running supers would assist, sounds like a cost effective way to resolve the issue if that works. Otherwise I have to find a buyer for 990 rounds of my 200gr haha
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Posted: 8/11/2022 1:15:11 PM EDT
[#9]
Quote HistoryQuoted: Hadn't thought running supers would assist, sounds like a cost effective way to resolve the issue if that works. Otherwise I have to find a buyer for 990 rounds of my 200gr haha If you've only run 10rd of subs through the new gun and nothing else that's likely your issue. Buy a few boxes of "cheap" supers to run though it and oil it up, then try the subs again. Subs can also be more mag-sensitive than supers due to bullet shape, what mags are you using? I've had zero issues with 300blk PMAGs. Okay/Brownells aluminum mags worked fine for me with supers and most of the time with subs, but not always. Subs would bind enough in the mag to slow down the elevation, and the MCX cycle is faster than a typical AR. Have with tried one round in the mag to see if it locks back on empty upon firing? If it does, it's likely a mag feed issue and not an ammo issue. |
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Posted: 8/11/2022 2:06:32 PM EDT
[#10]
I'm using 5.56 pmags seeing as the brass is the same I wouldn't think it's an issue but perhaps the mouth of the mag is different with 300blk pmags? I mean, I know they make them but I just didn't see the purpose, perhaps I'm mistaken using the 5.56 ones? Either way, I'm going to get a box of some cheap supers to run through and see if it will cycle. I'll probably do that next Wednesday.
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Posted: 8/11/2022 2:17:08 PM EDT
[#11]
Quote HistoryQuoted: I'm using 5.56 pmags seeing as the brass is the same I wouldn't think it's an issue but perhaps the mouth of the mag is different with 300blk pmags? I mean, I know they make them but I just didn't see the purpose, perhaps I'm mistaken using the 5.56 ones? Either way, I'm going to get a box of some cheap supers to run through and see if it will cycle. I'll probably do that next Wednesday. The ribs on the sides up front are the issue. A heavy 308 bullet is much wider at the ogive than a 5.56 case neck, so they tend to nose in towards the center of the mag and bind the stack. I would try the one-round test with an empty mag before anything else. If it locks back every time you have your answer.  Attached File |
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Posted: 8/11/2022 3:12:53 PM EDT
[#12]
The 6.75" is notorious for this and there are plenty of posts in the Sig Armory section about it. It just needs some rounds in and it'll work fine. Otherwise if you call Sig they can help you out, as it seems there is more than one gas plug.
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Posted: 8/11/2022 4:56:37 PM EDT
[#13]
I'm definitely less informed on these things than I should be, but this illustration is extremely helpful to understand what you're saying, I'm going to see if it locks back with a single round and then possibly explore mags if the other suggestions don't work, ie: a couple mags of supers and a serious upper lube. I'd like to exhaust all options before sending it to SIG.
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