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Almost had a real bad day
- Thread starter NH_Realtor
- Start date
Good info there.
Definitely a theory versus reality thing, if you see this video you note he chambers it up no problem and kabooms on the first trigger pull.
View: https://www.youtube.com/watch?v=RbfIkaNlECo
Mesatchornug
NES Member
The 300 Whisper round (predecessor to 300AAC) was developed for subs, so they were using heavy bullets and every last bit of space for powder. So that makes a lot of sense.
Supers use lighter projectiles; so there are potentially thinner profiles, and less interference with the powder charge. This conversation got me to search around real quickly, here's a visual comparison of some commercial 300AAC cartridges
(someday I might feel compelled to drop a couple of these into the same overlay, but not today)
eboos
NES Member
Your AR looks a little swollen. Hopefully it feels better soon.
The 300 Whisper round (predecessor to 300AAC) was developed for subs, so they were using heavy bullets and every last bit of space for powder. So that makes a lot of sense.
Supers use lighter projectiles; so there are potentially thinner profiles, and less interference with the powder charge. This conversation got me to search around real quickly, here's a visual comparison of some commercial 300AAC cartridges
(someday I might feel compelled to drop a couple of these into the same overlay, but not today)
I edited my post there after watching the video again. I think the video maker actually was saying he thought you stood a better chance of squeezing a lighter round through the barrel and that statement I made was incorrect as far as chambering subsonic versus lighter ammo - maybe they all do, maybe not, but isn't what the guy in the video said anyway.
This is why I got rid of the 1 300 blk upper I had. It doesn't do anything I'll ever need any better than 5.56, and if you shoot a lot it is too easy to blow up a gun making that mistake.
I think the only way to do it is visibly mark seperate mags for 300blk only and keep them in seperate .50 cal cans marked for .300blk only and keep the ammo marked and seperated also and never deviate from the system you put in place.
I think the only way to do it is visibly mark seperate mags for 300blk only and keep them in seperate .50 cal cans marked for .300blk only and keep the ammo marked and seperated also and never deviate from the system you put in place.
eboos
NES Member
Just looking at that comparison, this looks like a recipe for disaster. I cannot imagine that the powder would fill the case volume so much that it would prevent the bullet from being seated deeper into the case. Even a very tight crimp would probably not prevent the bullet from seating deeper during the normal operation of the gun. I've had one brand of bullets (.45 SWC, don't remember the brand but they come in a wood box) that would seat deeper if you just looked at them the wrong way regardless of crimp.
AHM
NES Member
This may help.
0.7 Amp 6 in. Compact Palm Polisher
Amazing deals on this 0.7Amp 6In Compact Palm Polisher at Harbor Freight. Quality tools & low prices.
www.harborfreight.com
eboos
NES Member
Dude, I am going to have to snag that gif. It will come in handy in the future I am sure.
This may help.
0.7 Amp 6 in. Compact Palm Polisher
Amazing deals on this 0.7Amp 6In Compact Palm Polisher at Harbor Freight. Quality tools & low prices.
AHM
NES Member
I found it by searching for it by name; a name which is NSFW.
I'm lucky to have found a copy that was uncaptioned.
The YouTuber FortuneCookie45LC found out that 454 Casull cartridges would fit in his S&W Model 25. The whole idea was that the longer cases of the 454 Casull would prevent it, same as with 357M versus 38SP, but with a good crimp on the 454 Casull cartridges, the slightly spacious charge holes in the Model 25 will accept. Would be a bad day to fire it. FortuneCookie45LC did not. I don't know how he found out. Possibly he was demonstrating for somebody that they weren't supposed to fit and discovered that they actually did.
I didn’t touch the forward assist, this was in like a 4 or 5 round succession. I kinda wish it had caused a malfunction cause I would’ve instinctively evaluated it. Everything functioned fine until that round.... didn’t.
I’ve decided to ditch my 300blk upper and ammo too.
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you ain't kidding... I'd run out of wall if I did that with all of 'em
Glad you're O.K.
Mesatchornug
NES Member
I 100% believe you. It sounded from your posts like everything behaved as expected, until it didn't. I'm sorry if it seemed like I was implying otherwise, and would be happy to edit my post to make that more clear.
Nah no worries just wanted to clarify what my happened in my circumstance. I’m a rare NES’r, I’m virtually unoffendable.
Despite everything functioning as it should I still f***** up and completely own up to it.
The worst case scenario that’s running through my head is this situation happening but I loaded the mag and handed the gun to someone else, especially a new shooter or something.
So if my f*** up can keep one person on their toes next time out then I’ll take it.
strangenh
NES Member
You're going to summon me one day without that conjuring circle, and then it's on.
![[angry]](/xen/styles/default/xenforo/smilies.vb/008.gif "Angry [angry]")
Anyhow, the bands don't go on each round. @Malodave gave those 300blk tag bands out, very cool, but misloading a round not going to be stopped by that. Eyes on the prize.
We regularly see some 9 brass on our range clearly bulged from the wrong chamber, whether from being in a .40S&W gun or .357Sig.
Mesatchornug
NES Member
recently found some 10mm brass that seems to have been shot through a 45ACP. I wonder what the shooter's experience was, but not enough to try it in my own.
AHM
NES Member
(BTW guyz, "300BO" sounds like a ham radio operator's nickname -
not an ammo caliber).
but I have read the eponymous story in this book:
en.wikipedia.org
So treat me right,
or your disappearance could be marked by nought but a tiny squeaking noise.
not some kind of of hack to keep ammo from chambering in the wrong gun.
not an ammo caliber).
I know nothing of that,
but I have read the eponymous story in this book:
Convergent Series (short story collection) - Wikipedia
en.wikipedia.org
So treat me right,
or your disappearance could be marked by nought but a tiny squeaking noise.
Oh, I always thought the bands were labels for the mags themselves -
not some kind of of hack to keep ammo from chambering in the wrong gun.
strangenh
NES Member
Well, right, but OP: ".300blk round made its way into my .223 ammo can and I wasn’t paying attention when loading my mag."
ETA:
While we're on the subject, SAAMI used to publish (404 now) a document on common unsafe mis-chamberings. It's gone (was up a year ago) but looks like someone put much of it into Wikipedia:
Unsafe firearm and cartridge combinations - Wikipedia
en.wikipedia.org
Last edited:
AHM
NES Member
![[thumbsup]](/xen/styles/default/xenforo/smilies.vb/044.gif "Thumbs Up [thumbsup]")
No contest.And it hasn't even merely moved someplace visible (i.e., Google-indexed) elsewhere on saami.org.
Perhaps SAAMI were overwhelmed with them negative waves,
and decided that rather than trying to enumerate all the failure modes,
they'd be legally on firmer ground by just publicising valid mixenmatches:
SAAMI: Generally Accepted Firearms and Ammunition Interchangeability
Just my idle speculation, but seems plausible on several levels.
Just wait; some rat bastard hoplophobe will delete it wholesale as Not Encyclopedic in 3...2...1...
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