Idaho Hunter1
Well-Known Member
Yes, I've checked that and the dimensions checked out. The ADG brass seems to be fine with the FGMM. Would I see the issue with any primer if it was a headspace issue with ADG?
CCI 250 not igniting
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Yes, I've checked that and the dimensions checked out. The ADG brass seems to be fine with the FGMM. Would I see the issue with any primer if it was a headspace issue with ADG?
I really wouldn't think so unless other primers didn't seat as deep as the 250s for some reason. In other words, if the other primers were some how a closer distance to the firing pin. I will also say that fgmm primers have a thinner cup than the 250s from my experience and may not take as much firing pin strike to ignite. But most of the fgmm primers I'm running are a good 12-13 years old vs new 250s..... Im assuming nothing has changed with the cup thickness on the fgmm over the years. You may have done this and disregard if you have but check an unfired adg case against a three times fired case from your other brand of brass & see how much head space difference there is.
kiwikid
Well-Known Member
The Forster Co-Ax press is designed so the primers can only be seated to a max depth of 0.004" below the surface of the case head. Can you measure how deep the primer pocket is with your callipers then measure one of your CCI primers height and deduct the primer height from the pocket depth? If the difference is more than .004" then the Foster press won't seat them deep enough.
Tolerance stacking of brass & primer may make for a tight fit. Harder then normal to seat primers.
If you cant feel the prime hit the bottom of the pocket, you need a new primer seating method.
The RCBS Ram Prime unit, used on a press, will fully seat any primer. Even if it needs to crush the primers.(shallow pockets)
Slow Firing pin velocity causes most misfires. Not your problem in 3 guns, unless the springs were all replace from the same supplier.
Could be a bad batch of primers? Try different brass.
If you cant feel the prime hit the bottom of the pocket, you need a new primer seating method.
The RCBS Ram Prime unit, used on a press, will fully seat any primer. Even if it needs to crush the primers.(shallow pockets)
Slow Firing pin velocity causes most misfires. Not your problem in 3 guns, unless the springs were all replace from the same supplier.
Could be a bad batch of primers? Try different brass.
It really could boil down to a bad batch of primers. May be just as easy to buy a 100 block of another lot of 250s & try them if the OP wants to rule out or prove that it's bad primers.
Idaho Hunter1
Well-Known Member
I think this is it! I just measured and it looks like the space is greater than .004. I also measured the FGMM vs the CCI250 and the FGMM are a bit thicker.
I'll try a hand seater.
Thanks to everyone!
lancetkenyon
Well-Known Member
Have you also checked firing pin protrusion?
Idaho Hunter1
Well-Known Member
I'll take a look at the RCBS unit. Thanks
Make sure the hand primer isn't the 200 series w/o the the pot metal head to insert the shell holder...mine fell apart...had to buy new universal with 'clips'....just wondering how accurate it is do to the movement of the clips....
Tripodmvr7
Well-Known Member
Great responses from accumulated knowledge.
1. A sticky firing pin cost a friend of mine a gemsbuck. I have cleaned mine of any oil and use graphite as a lubricant.
2. A slightly thicker cup has been mentioned and with the deeper pocket could combine to be the problem.
1. A sticky firing pin cost a friend of mine a gemsbuck. I have cleaned mine of any oil and use graphite as a lubricant.
2. A slightly thicker cup has been mentioned and with the deeper pocket could combine to be the problem.
lancetkenyon
Well-Known Member
Sticky firing pin would have cost my cousin an elk on the last 4 minutes of a hunt. Luckily, the ***** tried to scare me when I was glassing 30 minutes before the end of hunt by touching off a round right behind me. Barely a click.
So we put it away. 26 minutes later, I spotted a bull, grabbed MY rifle, and he got his first ever elk.
Did taking the bolt apart, cleaning& lubing fix his sticky firing pin?
lancetkenyon
Well-Known Member
After we got back, it did.
No lubrication after that. We live in AZ where humidity is not a problem.
I had told him to strip it and leave it dry before the hunt. He didn't. But it all worked out perfectly.
