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QHMC ~9/43 |
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Rebel92
Grunt Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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I learn something new everyday! I knew the wood looked different but didn’t know there was a name for it
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Sawbones
On Point Joined: Mar 04 2022 Location: Texas Status: Offline Points: 150 |
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Plunk test? What's that and what does it tell me?
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"Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut." Ernest Hemingway
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john843
Recruit Joined: Jan 29 2021 Location: south carolina Status: Offline Points: 97 |
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Sawbones, I think the "plunk test" is simply dropping a round manually straight down into the chamber to see if it drops and seats into it without any assistance. John |
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floydthecat
Hard Corps Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1998 |
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Yep….the term has been around for a long time. Drop-in a round and see how it lands in the chamber. You can also tell a little bit about how a barrel might head space….how deep or how high the rim sits.
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Rebel92
Grunt Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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Yep, FTC told me what the plunk test was. That simple test told me a lot about what bullet profiles a carbine did/didn’t like.
I find it interesting that my only picky carbine, a QHMC, is also the same manufacturer as Sawbones Carbine, which he states also doesn’t like commercial ammo’s different bullet ogive When compared to milsurp
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floydthecat
Hard Corps Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1998 |
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Collector is one thing shooter is another. A shooter….maybe chase the chamber with a finish reamer to make it shoot whatever commercial is on the shelf. Of course one can reload to make it work, but not much bothers me as much as a gun that won’t shoot ammo that’s made for it. “Chase” is a touch and it doesn’t take much. Could be the fault of the ammo, but by far most carbines will chamber and shoot whatever is on the shelf.
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Sawbones
On Point Joined: Mar 04 2022 Location: Texas Status: Offline Points: 150 |
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Rebel92 sent me an assortment of cartridges to run thru my Chrony. All the milsurp rounds fed beautifuly w/ no hang-ups. The non-milsurp rounds were loaded w/ copper plate projectiles seated in low 1.670s". 100% of the non-milsurps mis-fed in my QHMC so I seated the bullets to ~ 1.660 and still 100% misfeeds. Close inspection (w/ magnification) of the seated copper plate projectiles revealed NO ogive. I pulled the bullet, inspected w/ magnification to find the ogive on that copper plated bullet was 1/3 the the buulet length up from the base whereas milsurp and other non-milsurp bullets the ogive is 2/3 up length from the base of the bullet. Me thinks the ogive being so close to the base of copper plate bullet is by design to be seated at the max SAAMI length of 1.680" instead of the typical milsurp of 1.660" give or take a3-4 thousandths either direction. Am I crazy?
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"Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut." Ernest Hemingway
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floydthecat
Hard Corps Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1998 |
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My carbines eat those x-tremes like corn going thru a goose and I don’t get real scientific about the seating depth. Ethan will surely sign in here soon, but he shoots a lot of them also, but I don’t know which carbine he shoots the most. I have not seen any comments concerning issues with those projectiles.
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Rebel92
Grunt Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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Floyd is correct, my carbines do fine with the xtreme projectiles (with the baby ogive) but my QHMC WILL NOT CHAMBER Armscor, or even the Bayou Bullet profile. It doesn’t like the fat ogives. I guess it’s a “fat shamer” and only likes them skinny LOL. But yes, the xtreme projectile profiles seem to work wel in all mine. And I seat them less than 1.678, usually closer to 1.67 even
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Rebel92
Grunt Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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I just noticed, I think I was wrong when I said "9/43" production. It was slightly earlier right?
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W5USMC
Moderator Group Joined: Apr 29 2017 Location: Missouri Status: Offline Points: 2959 |
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Maybe a couple months earlier.
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Wayne
USMC Retired NRA Life Member |
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Rebel92
Grunt Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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Thanks Wayne. I knew it wasnt much, but was just looking at the estimated serial number production dates somewhere else online and saw QHMC's made in September would have been in the 4 mil serial number block.
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Rebel92
Grunt Joined: Jul 20 2021 Location: Hattiesburg, MS Status: Offline Points: 541 |
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Sorry I was lazy. Jus took my safety and mag catch out. Data sheet needs updating. Safety IS marked. “Q-NL”
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