Using 6mm Creedmoor in a 6.5mm Creedmoor rifle?

[Downeast]

I just checked the date and it seems like you guys did an excellent job running Fred off. Let's hope we didn't give birth to another "anti".

 

[VBSB761]

In my youth I loaded many 270 rounds made from 30-06 brass and alas a friend who used the same color and style aftermarket cartridge boxes accidentally shot 6 of them in his 30-06, he missed a jackrabbit at 15 yards all 6 times and I have no idea why that jackrabbit just sat there while I was talking crap about Charlie not being able to hit the rabbit so close. At any rate pressures were very low, a lot of unburnt powder in the bore and one clean patch brought his barrel back to it's sparkling self. However the necked down to 270 30-06 cases didn't fully obturate and the chamber required a bit more attention than the barrel to get the unburnt powder out and there was even some residue in the action. I say even though pressure might not be an issue unburnt powder exiting the action in your direction can be. So no I don't recommend doing it.

Interesting story. Gotta be really careful with this, though- for newbies like the OP, it should really be emphasized, as it was on page 1, that you ONLY ever shoot the caliber for which your firearm was designed in it. Big reason is that although something like a .270 round in a .30-06 might work like that, the opposite would be really disastrous- and can happen in some cases. Example, if you use 9x18 Makarov in a 9mm Parabellum pistol, you essentially have a pipe bomb. The Russians designed the caliber this way intentionally to keep us from using their ammo.

 

[Pheasanthunter]

Interesting story. Gotta be really careful with this, though- for newbies like the OP, it should really be emphasized, as it was on page 1, that you ONLY ever shoot the caliber for which your firearm was designed in it. Big reason is that although something like a .270 round in a .30-06 might work like that, the opposite would be really disastrous- and can happen in some cases. Example, if you use 9x18 Makarov in a 9mm Parabellum pistol, you essentially have a pipe bomb. The Russians designed the caliber this way intentionally to keep us from using their ammo.

No wonder gun ranges have so many rules and the liability insurance is so high. I never would’ve thought.

 

[Old Navy]

Lol.

Can I run my duramax off regular gas instead? Diesel is getting stupid expensive again...

Depends on the getting the gas / fuel ration right.

 

[Tokay444]

This has to be a troll post.

 

[Duravan]

Don’t mean to practice necromancy here, but it happened to me yesterday. Semi auto. Bought ammo online, they shipped 10 boxes in 1 cardboard. 1 was actually 6 CM, which I didn’t notice… Same recoil, cycled well, except for no holes at a 100 for 5 shot group. I run a lever on mount and cleaned the rifle right before, leaving Labradar at home, so no velocities. Checked the bore, all good. Didn’t check ammo, coz I shot it before and it was just fine… Decided to switch to 5 shoots at 50, got keyholes. First thought - fking godness, second bullet is understabilised, high baro etc. packed my crap, went home. Thought process led me to checking the headstamps. 6 CM. Rifle used to shoot <.5 MOA, now over 1. Just gave it deep cleaning, removing some carbon ring formation with JB, waiting to shoot it later today to see if it comes back to <.5. That’s 11 rounds total. Conclusion - don’t do this.

 

[spudgun]

I did the same thing last year with my 6.5 CM.

Went to the range with both my 6mm and 6.5 Cm. Went to shoot the 6.5, I grabbed a 6mm CM round instead.

Pulled the trigger and noticed that the sound of the shot just was too quiet. and less recoil.

Looked at the round and figured out my mistake.

Also the bullet never registered on the 1000 yd electronic target.

 

[Duravan]

I did the same thing last year with my 6.5 CM.

Went to the range with both my 6mm and 6.5 Cm. Went to shoot the 6.5, I grabbed a 6mm CM round instead.

Pulled the trigger and noticed that the sound of the shot just was too quiet. and less recoil.

Looked at the round and figured out my mistake.

Also the bullet never registered on the 1000 yd electronic target.

Any issues with the rifle afterwards?

 

[spudgun]

Any issues with the rifle afterwards?

No, only shot 1 round. checked the brass, Good, Checked the bore, no issues.

Kept shooting with proper ammo and ended up with a 9.8" group on the 1000.

 

[338 dude]

Just like the title says...is it possible/ok/safe to shoot 6mm Creedmoor in a 6.5mm Creedmoor rifle?

My story is that I went to pick some 6.5mm Creed up from the store for a friend... did an oopsie and got 6mm (instead of 6.5mm).

After doing some research, it looks like PSI's, cases, etc... are same. Basically, 6mm Creed necks down to the smaller bullet/projectile size.

The barrel may be a little bit big and twist may be off, but I'm guessing it would be OK running 20 through just practicing?
Any feedback is welcomed and thanks in advance!

No!!!

 

[akajiggs]

Lol.

Can I run my duramax off regular gas instead? Diesel is getting stupid expensive again...

Yes you can for a little while.

 

[Duravan]

Wait a second, I was hoping to understand how a .243 bullet could be shot in a .264 bore...or could it even work without pressure? Hmmm...For all I know it could be using some of that new style rifling that allows a monkey to control the twist of the bullet to be stable with any amount of powder.

Pressure bleeding isn’t enough to prevent bullet from being pushed through the pipe. Enough is mounted even at the end of the barrel to cycle heavy semi bolt. Also there isn’t much rifling contact, so way lower pressure needed.

 

[Duravan]

Pressure will get you every time, either high or low! LOL

I'm kind of starting to understand why I get treated the way I do on shooting forums with some of my questions. I'm more than willing to admit I'm wrong or just don't know and that seems to give the haters some ammo, for lack of a better analogy.

On forums most people get what they are actually looking for

 

[Lkwebb]

Think you might need a mental health check up.

 

[Duravan]

I have to claim ignorance here, but if that's a 100 yard group, it looks like 2 out of the 3 were tumbling which doesn't seem good at 100 yards...I could understand 700-1000 yards, but 100 ???

That’s 50. All 3 tumbled, look closer.

 

[gsardokla]

Don’t mean to practice necromancy here, but it happened to me yesterday. Semi auto. Bought ammo online, they shipped 10 boxes in 1 cardboard. 1 was actually 6 CM, which I didn’t notice… Same recoil, cycled well, except for no holes at a 100 for 5 shot group. I run a lever on mount and cleaned the rifle right before, leaving Labradar at home, so no velocities. Checked the bore, all good. Didn’t check ammo, coz I shot it before and it was just fine… Decided to switch to 5 shoots at 50, got keyholes. First thought - fking godness, second bullet is understabilised, high baro etc. packed my crap, went home. Thought process led me to checking the headstamps. 6 CM. Rifle used to shoot <.5 MOA, now over 1. Just gave it deep cleaning, removing some carbon ring formation with JB, waiting to shoot it later today to see if it comes back to <.5. That’s 11 rounds total. Conclusion - don’t do this.View attachment 1342066

I'd be too embarrassed to admit it. However, it is a very good teaching point, and, one that I would have never thought could happen. Someone in shipping or picking/fulfillment messed up somewhat.

 

[Duravan]

Btw after cleaning rifle returned to 0.5 MOA, so no permanent damage done.

 

[ebb]

Fred the OP registered Sept 1, 2021 he was last seen Sept 2, 2021. I think he was looking for something he didn't get.

 

[bozo699]

This has got to rank up there in the top 100 most ignorant posts!…..
Wayne

 

[bozo699]

That's pretty strong coming from a bozo! j/k

I hope you weren't talking about me, but if you were no worries, just that if it is I'm probably gonna have a hard time getting on that "Good Guys" list.

Your not the op are you?…….
Wayne