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Can 6mm chamber in a 243 barrel?

Posted on 4/13/21 at 5:14 pm
Posted by Jack Ruby
Member since Apr 2014
24050 posts
Posted on 4/13/21 at 5:14 pm
Wouldn't a 6mm Creedmoor fire out of a 243 barrel?
This post was edited on 9/10/21 at 1:48 pm
Posted by 4mileduckman
orig from lake charles
Member since Jan 2013
882 posts
Posted on 4/13/21 at 5:24 pm to
I believe a Case on a cdmr is much larger in diameter . So no
Posted by auggie
Opelika, Alabama
Member since Aug 2013
28936 posts
Posted on 4/13/21 at 6:33 pm to
There was a guy that came in the local gunshop the other day, he had tried to chamber one 6.5 round, into the chamber of another type of 6.5 rifle. I guess he tried to use a hammer on the bolt handle to get it to chamber, because he broke the bolt handle off. He brought it in to see if it could be fixed and still had the round stuck in the gun.
The owner called him all kinds of stupid, got the round out, handed the gun back to him and told him to take it home and never touch another firearm.
what the hell, go ahead and try it.

This post was edited on 4/13/21 at 6:36 pm
Posted by lsujunky
Down By The River
Member since Jun 2011
2367 posts
Posted on 4/13/21 at 6:39 pm to
Parent Casing 6.5 Creedmoor vs .308 Win
Bullet Diameter 0.243” - 0.243”
Neck Diameter 0.275” - 0.276”
Base Diameter 0.473 - 0.471”
Case Length 1.92” - 2.045”
Overall Length 2.8” - 2.7098”
Case Capacity 51gr - 53-54.8gr
Max Pressure (SAAMI) N/A - 60,000psi
Posted by turkish
Member since Aug 2016
1970 posts
Posted on 4/13/21 at 6:51 pm to
Bullet “width?”

The diameters of the bullets for every “6mm anything” and every “243 everything” are not only within 3 hundredths of a mm of each other, they are exactly the same. This does not imply that any of those chamberings’ ammo should be interchanged unless the shooter’s aim is injury or firearm damage.
This post was edited on 4/13/21 at 6:59 pm
Posted by bbvdd
Memphis, TN
Member since Jun 2009
25895 posts
Posted on 4/13/21 at 8:19 pm to
No, you could nit get the 6 cm in the .243.

The 6 cm is a straight wall case and the .243 has a taper.
Besides that the case on the 6cm is shorter.

There is a technique called fire forming a cartridge but the cartridge needs to be pretty close to the chamber prior to fire forming.
Posted by TheDrunkenTigah
Baton Rouge
Member since Aug 2011
17532 posts
Posted on 4/13/21 at 8:56 pm to
Don’t listen to all these haters, go for it
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