6.5 Creed misfires…

[Rehner23]

Hey everyone, I’ve been out with my 6.5 Creedmoor firing some Perterson SRP brass for the first time. I’ve gotten 3-4 misfires out of about 75 cases. The primers look to be getting struck well, I’ll try to fire them 4-5 times before I give up on them! But no go.
What’s the typical cause? I checked the shoulder bump vs a fired case and these are .007-.008” bumped. Is that enough to cause misfire?.. The other thing that I’m thinking is that the primers may not be seated deep enough? I haven’t measured them, but they look to be flush with the case.
This rifle has about 700 rounds through it and I don’t remember it ever misfiring with this type of frequency, or really ever at all.
I do have 150 rounds of Peterson SRP brass that I’ve been using through this gun without issue.
For reference this is a Defiance Deviant action, Bartlein barrel. CCI 450 primers. H4350 powder.
Let me know your thoughts please!
Thanks

 

[6.5 forever]

Are you making sure the primer is being seated to the bottom of the pocket.

 

[WSnyder]

Can’t say it’s your problem but primers flush with the case is not deep enough.

 

[mac86951]

Several possibilities.

Sounds like you've eliminated light strike; however if you've bumped the shoulder by 0.007-0.008; that may be enough to mess up headspace and otherwise perform similar to light strikes. 0.003-0.004 is enough for a gas gun, less for a bolt. IE oversized brass /headspace issue is one possibility

Other possibility, bad primers. Anything we should know about storage / temperatures or humidity? This maybe a stretch, but it's worth a thought.

What about your brass prep? We're the cases still damp? IE what if something in your process is deactivating the primers? Walnut media in flash hole. Wet brass, case lube, etc...

Based on your description I'm leaning toward maybe oversized; but you be the judge.
-Mac

 

[Laurie]

Have the primers ignited or not? If yes, the likely cause is that some SR primer make/model + powder grade combinations are marginal for ignition with the Creedmoor's charge size.

If no, as per Posts 1-3.

 

[marchx]

I had 4 misfires during a prs match. Inspected the rounds in question after that. Probably cause humidity affecting the primers. Everything else was ok.

 

[JB10]

I have also been having issues with the cci 450 primers. This was in a 6x45. I thought i has it narrowed down to too much shoulder bump while forming the cases. I ended up taking some cases that would not fire, knocked the primers out and changed primers. Added powder back and bullet. They all went off. The primers that worked on cases that would not fire with the 450 were Remington 7 1/2, cci 41, and federal 205. So at this point i will change primers for this cartridge.

 

[DLT]

I have also been having issues with the cci 450 primers. This was in a 6x45. I thought i has it narrowed down to too much shoulder bump while forming the cases. I ended up taking some cases that would not fire, knocked the primers out and changed primers. Added powder back and bullet. They all went off. The primers that worked on cases that would not fire with the 450 were Remington 7 1/2, cci 41, and federal 205. So at this point i will change primers for this cartridge.

Your not alone my friend. Many many threads about those primers last couple of years including myself. Sometimes they would go off on the second or third attemp.

 

[Prose]

Srp in the cm is a risk not worth taking imho, especially in the cold

 

[DirtySteve]

Too much shoulder bump.

 

[Rehner23]

Several possibilities.

Sounds like you've eliminated light strike; however if you've bumped the shoulder by 0.007-0.008; that may be enough to mess up headspace and otherwise perform similar to light strikes. 0.003-0.004 is enough for a gas gun, less for a bolt. IE oversized brass /headspace issue is one possibility

Other possibility, bad primers. Anything we should know about storage / temperatures or humidity? This maybe a stretch, but it's worth a thought.

What about your brass prep? We're the cases still damp? IE what if something in your process is deactivating the primers? Walnut media in flash hole. Wet brass, case lube, etc...

Based on your description I'm leaning toward maybe oversized; but you be the judge.
-Mac

Hey, thanks for the reply.. as far as bump goes, it’s new brass, so I haven’t sized it. When I compare it to a fired case the new brass is bumped back .007-.008”.
I didn’t clean them with media.. I did take a very small skim off the necks.. I guess it’s possible some lube fell inside those cases. I’ll pull them apart tonight and inspect.
I’m really thinking it’s a combination of the cases being set back too far for my chamber and the primers not seated all the way.

 

[Rehner23]

Srp in the cm is a risk not worth taking imho, especially in the cold

I hear you, but it wasn’t cold yesterday where I am, and even if that was a problem, wouldn’t the primer still ignite?

 

[Rocketvapor]

Agree, likely soft seated primers.

 

[Rehner23]

Have the primers ignited or not? If yes, the likely cause is that some SR primer make/model + powder grade combinations are marginal for ignition with the Creedmoor's charge size.

If no, as per Posts 1-3.

I’m not sure, but I don’t think they ignited at all. I’m going to pull them tonight and check.

 

[shoot4fun]

Hey everyone, I’ve been out with my 6.5 Creedmoor firing some Perterson SRP brass for the first time. I’ve gotten 3-4 misfires out of about 75 cases. The primers look to be getting struck well, I’ll try to fire them 4-5 times before I give up on them! But no go.
What’s the typical cause? I checked the shoulder bump vs a fired case and these are .007-.008” bumped. Is that enough to cause misfire?.. The other thing that I’m thinking is that the primers may not be seated deep enough? I haven’t measured them, but they look to be flush with the case.
This rifle has about 700 rounds through it and I don’t remember it ever misfiring with this type of frequency, or really ever at all.
I do have 150 rounds of Peterson SRP brass that I’ve been using through this gun without issue.
For reference this is a Defiance Deviant action, Bartlein barrel. CCI 450 primers. H4350 powder.
Let me know your thoughts please!
Thanks

To reiterate some of the above replies, I believe you are suffering misfires due to a combination of issues.
New brass with tight primer pockets and .008 bump alone is a recipe for problems. If you have rounds left over from that shooting session I would suggest carefully giving those primers a little more shove into the pocket.
Now, do you know the reason behind SRP brass for 6.5 Creedmoor? Wasn't it done to help the brass survive very high pressure loads many are forcing through their rifles?
I suggest staying with LRP brass. You're asking a lot for a SRP to consistently ignite a rather sizable dose of H4350, especially IF you don't have everything buttoned down 100%.

 

[Idaho-Lefty]

If, IF, IF,.. All Else, Fails,.. THROW them, in the TRASH and buy some, LARGE Rifle Primer, Peterson Brass as,..
I've NEVER,. ever,.. had, a Missfire with,.. THEM and, F-210M's
RE-Read carefully, Posts,.. # 5 and, # 8

 

[jkirk]

Are you getting any hang fires? Or just all misfires?

 

[Rehner23]

Are you getting any hang fires? Or just all misfires?

All misfires.. never had a hang fire, so I don’t think the primer is getting ignited at all..

 

[Rehner23]

If, IF, IF,.. All Else, Fails,.. THROW them, in the TRASH and buy some, LARGE Rifle Primer, Peterson Brass as,..
I've NEVER,. ever,.. had, a Missfire with,.. THEM and, F-210M's
RE-Read carefully, Posts,.. # 5 and, # 8

I’ve never had an issue with the other 150 cases that I have. I get that some may think the Creedmoor is a big case for a small primer.. but the primer not igniting at all shouldn’t have to do with the size of the case. If it fails to burn the amount of powder properly that would be a different story.

 

[shoot4fun]

I’ve never had an issue with the other 150 cases that I have. I get that some may think the Creedmoor is a big case for a small primer.. but the primer not igniting at all shouldn’t have to do with the size of the case. If it fails to burn the amount of powder properly that would be a different story.

Okay, and please believe me when I say I am not asking to be mean or condesdinding, but have you pulled the bullets on those misfires to make sure they have powder in them?
S@@T happens to all of us sooner or later.