6mm BRA primer issue

[rickhirsch]

The CCi 450s have a thicker cup. The cold congels the oil/grease, slowing the pin fall. Sounds like your ignition system is right on the edge. You ned a stronger spring or maybe detail strip your bolt asm and clean it real good. And verify pin fall! Also primers need to be seated to pre-load the priming mixture. Also if you are over sizing your brass and increasing the headspace, it will make the primer harder to set off. You don't have a primer problem, you have an ignition problem. The easy button is thinner primers, until your ignition system get worse.

Frank

thanks frank i've stripped the oil out of the bolt put in -35 degree gun oil. my spring is a kelbly and its new
24 pound spring . they told me to switch primers. I got federal match primers going now. 2 tenths more
powder and . 003 more length . I didn't want to change the barrel has 1200 rounds on it . it still shoots
pretty good .I usually shoot at leased. 1or 2 groups in 1.'s at 600yds hope the next barrel shoots this good
thanks again frank. RICk

 

[762plinker]

I did check the firing pin fall it looked like about .05 to .055 but maybe I should actually check with a
depth mic. as far the oil I used very little and it is supposed to be good to -35 degrees. I went back to
grease just little bit .so I got a priming tool that could set to a .001. I like Alex's Idea about it firing pin
it wouldn't hurt to get a new the pin is 25 years old. but it is weird that br4 work and not cci 450 won't.
federal work. and i tried three different lots of 450?

seat primers to the BOTTOM of the primer pocket and then a small crush in place.....seating to a random depth(.001) is asking for ignition problems...ohh thats what we have here...there is a reason to uniform the primer pocket depth

 

[boltfluter]

You could always try a K&M seating tool. Very economical and made out of steel. Very good feel and no mechanical stop, which is asking for trouble. In my opinion, you need to be able to feel the primer bottom out and then give it 2 to 3 thousandths of crush. I run 450's in most of my rifles and never have misfires doing the seating this way. Just a thought.
Paul

 

[Liven The Dream]

Century 21 not a bad one. Like the click adjustment. Only had Wolf SRM not be 100% in my Dashers, 450's always.
Old Lee was Great .

 

[Webster]

thanks Alex any info from you greatly appreciated . in my neck of the woods most of the better benchrest
shooter's have stop shooting .due to getting old or dying .there's been a few unfortunately. or the components have got expensive and scarce. so I've been shooting about a year and a half at mid range
sometimes you just need a sounding broad .thanks to all who replied it helped . still don't why the cci 450's
don't go boom. when is cold . but i will change out the firing pin. After the next shoot .
but good news is that shot today and federal match shot very well at 100yds.I'll take it out to 600 yds next week. someone asked if the cases were new or sized they have been shoot 12 times . annealed very sizing.
thanks again Rick

Not clear to me how you are seating the primers. If they are not seated to the bottom of the pocket FP energy is lost pushing the primer forward in the pocket. Nothing to do with the primer brand, FP protrusion, oil ect. I would bet money on it. Think of how hard you push on a hand held priming tool lever to seat a primer. This is the kind of energy lost pushing a primer a few thou deeper by the FP.

 

[Alex Wheeler]

How much firing pin fall?

 

[moondog]

thanks frank i've stripped the oil out of the bolt put in -35 degree gun oil. my spring is a kelbly and its new
24 pound spring . they told me to switch primers. I got federal match primers going now. 2 tenths more
powder and . 003 more length . I didn't want to change the barrel has 1200 rounds on it . it still shoots
pretty good .I usually shoot at leased. 1or 2 groups in 1.'s at 600yds hope the next barrel shoots this good
thanks again frank. RICk

I'm having a similar issue with my Kelbly's Black Bear L.A. It's a 300PRC, Lapua brass, CCI BR2s. This is an ELR rig. Developed a load and did test primers, 200s, 215s, 210s, BR2s, 9 1/2s. BR2s shot the best, 200s second, 210s 3rd. At a match a couple weeks ago I had 3 out of 100 with a hang fire, one failure. Pulled the bullet and powder wanted to go off, but didn't. All the primers look like lite hits to me compared to all my other rigs. I checked fall, .255", protrusion is .055". Pockets have been uniformed, flash holes chamfered, shoulders bumped .001. I know the primers are seated correctly. Kelbly's told me the same thing, switch primers. I have 2 bolts, (long story) same issue. They told me it's a 24lb spring, haven't checked it but it seems like a reoccurring theme here.
I'm thinking a heavier spring may help?
I don't know if they're available in maybe a 28lb version. Thoughts? I'll be running the 210s at the next match until I have time.

 

[rickhirsch]

it takes a gun smith thanks Alex I'm machinist built a few guns a lot guns . but I didn't how to check firing pin
fall i thought how much it was sticking after the pin was fired not so .so I rechecked the fall and it was .200
i call kelbly and asked them about having .200 fall and they said that they had a .05 trigger hanger so I bought one and now i have .250 fall and now cci 450 are not a problem . s/d's are back to normal .
I didn't have a clew .about what was happening thanks' to the good guys on accurate shooter I now know.
I would have got to this sooner but covid got in the way . thanks guys Rick