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New Lot CCI 450 issues

superde

superde

Gunny Sergeant
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Minuteman
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Nov 7, 2003
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Bryan, Texas
#1
Anyone had ignition issues with this lot of CCI 450’s? I had 3 rounds not go off during a match a few weeks back. Two of the three rounds went off on the second attempt. They are seated .005” deep in Alpha Brass. Never had an issue with this rifle until this new lot of primers. I’m going to try my spare bolt next time I go out to the range.
 

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#2
superde said:
Anyone had ignition issues with this lot of CCI 450’s? I had 3 rounds not go off during a match a few weeks back. Two of the three rounds went off on the second attempt. They are seated .005” deep in Alpha Brass. Never had an issue with this rifle until this new lot of primers. I’m going to try my spare bolt next time I go out to the range.
Click to expand...
Seems to me, being .005" below flush is a good place to be. Of course, it depends on how deep you pockets are??? How did the primers look in term of how the firing pin struck them?

Yeah, check with that spare bolt is a good idea. It might be a firing pin issue is you're looking at light strikes on the primers???
 
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#4
How many rounds on this action? Does your action use a trigger hanger? Are you sure the primers are seated deep enough?
When's the last time you did a full tear down and cleaning of the bolt? Or last time you changed the spring?

Only time I have ever had these issues is one of the above or the cocking piece dragging on the sear.
 
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#7
superde said:
These were two of the failure to fire rounds, primer strikes look good. I sent the picture to Tate/Impact as well and he agreed.
Click to expand...
It's really hard to tell in those pictures as they kinda look a little light, but not enough where I wouldn't think it'd keep them from igniting.

The other place I'd take a close look at is the case headspace; a short case headspace can cause this issue too???
 
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#8
Thanks gentlemen. I had 400 rounds fire without issue with the last of my old lot of 450’s with this barrel. There are probably over 30k rounds on this action and a lot of dryfires. Trying the extra bolt I carry in my pack should show if it is a firing pin spring/firing pin issue (bolt has probably 100 rounds on it).
 
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#9
I’d either way pop the primers out

And see if you can hit them with a nail/ hammer

Just to see if they’ll even go off!

I do this with junk ammo like wolf and Tula as they def have soooooo many mis fires

And playing cartridge surgeon is always fun
 
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#15
trlrman said:
View attachment 8649483BR 4's this weekend. They didn't fire either.
Click to expand...
Are these virgin brass?

I suspect the case's headspace are too short. Such a thing makes it where the case is pushed forward enough where the firing pin won't deliver enough force to the anvil inside the primer to cause it to ignite. The primer surface still gets indented, but it's being cushioned by the case moving forward by quite a bit. It's similar to a primer seated too far from the bottom of the pocket.
 
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#17
trlrman said:
Yes, they were 1st timers , shot 246 others with no problems ?
Click to expand...
Since virgin brass is really not all that uniform in their dimensions (why typically fire forming is done before load development), that pretty much explains the problem for me. That being . . . those particular cases of your lot were too short. :rolleyes:

If they haven't been fired yet, you can measure them (their headspace) and see how they compare to those that have been fired. And to get them fired, you might need to simply use a more sensitive primer. . . like the CCI-400's well seated to the bottom of the pockets??? :giggle:
 
#19
jthor said:
.005" deep seems right for Alpha Brass and 450s, thats where mine sit. Trying to eliminate any potential mechanical problem within the firing system, when's the last time you changed the firing pin spring?
Click to expand...
I have never changed a FP Spring, lol. Now that I’ve done some reading, it appears some people change them annually.
 
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#23
superde said:
@jthor and @LR1845 What actions are you both running, and what springs are you using? I just looked at Impact and they are out of FP springs.
Click to expand...
I am running 2 CDG actions right now but going back to lone peak as soon as my barrel comes in, I order 2-3 springs at a time from the action maker, when I get down to the last one I order 3 more. I bet if you call Impact they will send you a spring free of charge. And FYI I do this same thing with a rim fires.
 
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