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Shot a 6.5CM out of a 308

Guan999

Private
Minuteman
Feb 3, 2023
21
4
Mckinney
so I was with a friend on the long range today, I had a 6.5 and he had a 308, we are both shooting Hornady. he handed me a mag to try his 308 rifle, and when I fired it didn’t sound right, almost no recoil and very soft sound. I tried to eject the case and ejector wouldn’t catch the brass, used a rod to get the brass out. I figured something was wrong so we inspected the brass and found it was a 6.5CM and the primer is blown out of the primer pocket, brass it self does not look deformed. My question is, Will firing this 6.5CM out of a 308 rifle damage the rifling?
 

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so I was with a friend on the long range today, I had a 6.5 and he had a 308, we are both shooting Hornady. he handed me a mag to try his 308 rifle, and when I fired it didn’t sound right, almost no recoil and very soft sound. I tried to eject the case and ejector wouldn’t catch the brass, used a rod to get the brass out. I figured something was wrong so we inspected the brass and found it was a 6.5CM and the primer is blown out of the primer pocket, brass it self does not look deformed. My question is, Will firing this 6.5CM out of a 308 rifle damage the rifling?
Luckily, copper and lead are much softer than barrel steel... So, like was said, 1 round shouldn't have damaged anything. It should be just fine.

And look on the bright side... Now you have a fire-formed piece of 7.62 Creedmoor brass handy.
 
Saw a guy do similar, put a 6 CM down a 6.5 CM bore. That one round trashed the bore.
 
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Luckily, copper and lead are much softer than barrel steel... So, like was said, 1 round shouldn't have damaged anything. It should be just fine.

And look on the bright side... Now you have a fire-formed piece of 7.62 Creedmoor brass handy.
Oh you saw that on facebook as well that thread was funny
 
Yeah should be fine. Once had a friend fire a few rounds of 375 CheyTac down a 408 CheyTac barrel and it was fine.
 
Buddy of mine borrowed my 40cal Glock and shot 9mm through it couple of years ago. No harm done. But plenty of people blew up their 223 by chambering and shooting a 300BLK round.
 
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Buddy of mine borrowed my 40cal Glock and shot 9mm through it couple of years ago. No harm done. But plenty of people blew up their 223 by chambering and shooting a 300BLK round.
That's because it's like trying to shove a '59 Cadiallac into a doghouse... 😂

You can always bounce a smaller bullet down the bore, but bigger = problems...
 
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I accidentally ran a 243 round through my 7mm-08. I completely missed a 4'x2' board at 100 yards. I was sighting in my wife's 243 and my 7mm-08 for deer season. The Fiocchi soft points we were using had nearly identical boxes. The 243 easily chambers in a 7mm-08. I'm not proud of it and I have no idea where that bullet landed but thankfully gun was unharmed. It shoots sub MOA as it did before I screwed up.
 
I wonder if I can fireform. 357 sig into .40 short and wussie?

Lol
You absolutely can... Same base diameter, and same length case, just bottlenecked down for 9mm instead of a 10mm...

When I worked at the machine gun range, and ran the ammo plant, we would pickup brass that we shot at the range (and some we purchased from police/LEO ranges) and process it, and reload it, and I found MANY 40 caliber rounds that were blown out to a .45 (I'm guessing someone load the Thompson mag while not paying attention... 🤦🏼

Sifting through brass like this on the drying racks...

D2EB2DE4-76DE-4A07-AE6E-47C6449677DF.jpeg


I found plenty of these...

A60B37DD-2199-475F-8C70-90E11483730B.jpeg
55ECFBC6-ADFC-4326-8C5C-8809BDE07BCF.jpeg
 
I once fired a few 260rem down a 308 AR10. Funny thing, I cursed the piece of shit AR for not cycling good reloaded ammo......so I hand cycled a few more......then I realized I was a dumbassand grabbed the wrong rifle/ammo combo. One of the joys of building the same rifle configuration in different cartridges......haha.

Had a few light bullet strikes in the brake......but nothing a boring bar couldn't fix.

As you can see in the post......it happens. Just clean the rifle really well and get yourself a borescope and look for MAJOR damage. Don't get all panty twisted over scuffs or patch lint in the bore. Barrel bores are pretty forgiving and take a lot of damage to show up on target.

Ern
 
Won’t hurt anything. I take it you didn’t have a can?

Don’t be surprised though if you feel like less of an alpha 308 shooting man. Just firing one round of 6.5 is known to drop testosterone levels almost 30%
No can, just a brake. It’s his new gun so once he realized it was a 6.5 he was pretty nervous about it.
 
I once fired a few 260rem down a 308 AR10. Funny thing, I cursed the piece of shit AR for not cycling good reloaded ammo......so I hand cycled a few more......then I realized I was a dumbassand grabbed the wrong rifle/ammo combo. One of the joys of building the same rifle configuration in different cartridges......haha.

Had a few light bullet strikes in the brake......but nothing a boring bar couldn't fix.

As you can see in the post......it happens. Just clean the rifle really well and get yourself a borescope and look for MAJOR damage. Don't get all panty twisted over scuffs or patch lint in the bore. Barrel bores are pretty forgiving and take a lot of damage to show up on target.

Ern
Yup, I am sure it was fine but just want to give my friend a piece of mind so I figured I’d come and ask some people with more experiences, I managed to hit 700 yard steel right after we cleared the 6.5 brass and chambered an actually 308 lol.
 
Never done it with a rifle, thank the Lord, but I took a 12ga and a 16ga dove hunting a few years back.

While they were flying good I caught myself about to drop a 16 in my 12. Don’t know if it could’ve gone off, but it made my heart jump a little.

Went back to dove hunting with one shotgun.

FWIW, I keep the 7x57 ammo a long way from my .25-06 when I’m sighting in deer rifles. That one could go boom.
 
Clean the bore and shoot it before you dick around with it. Clean only because you might have a fragment or two you don’t see with the naked eye, and that could cause issues when you fire a correct diameter bullet.

When I was young and poor, I bought a few “shot out” rifles and after scrubbing the bore, they shot fine. Barrels are tough.

As some said above, the steel barrel is way harder than the bullets you were shooting.
 
I’m told a 50 BMG round will fit into a 12 gauge break open shotgun.

Haven’t tried that one, and won’t. Some things are better left untested.

While they were flying good I caught myself about to drop a 16 in my 12. Don’t know if it could’ve gone off, but it made my heart jump a little.
 
Just a follow up

When I ran range at PD we had 9mm, 40SxW and 45ACP guns

We had to put the 40 and 9 on opposite sides of the 100 yard wide range because every range day many would screw up and put 9 in a 40 and then yell “Sergeant my gun keeps jamming”

Not one weapon hurt out of hundreds of f ups

When I taught police snipers we had to do same with 308 and 6.5 because 308 guys would screw up and put a 6.5 in a 308 once in awhile

The problem and it’s a big one is when you try to punch a larger diameter bullet down a smaller hole. Then you create a pipe bomb type event

I personally won’t have 300 BLk near 5.56 because it will chamber and then cause a catastrophic event when it goes off
 
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