Didn't mean to distract from the issue, hell I could be having the same problem and just dont even know it.
Coal gets longer and longer
- Thread starter Chesterrose79
- Start date
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I misunderstood what you were saying. No I don't measure after cycling the action unless I had a problem closing the bolt. Don't measure them after that. If it gets longer then I'll blame viagra and look the other way.
Exactly, I don't measure either.
Ga6570
Well-Known Member
Measuring tool is "Calipers"
Ga6570
Well-Known Member
i figured this meant you didnt measure the loaded rounds after having chambered one and ejected it. -
when reloading we check the COAL frequently to make sure they are consistant
Of course…. yeah I just never thought to measure ammunition again later unless there was a problem.. I like probably all of you keep my data in a book to replicate it time after time. This is an interesting post tho, Id love to know what is causing his dilemma?
TRexF16
Well-Known Member
I'm the same. I am crazy precise with all my measurements but i have never once measured the parameter the OP is experiencing. Maybe it happens to me all the time too!
Mike Matteson
Well-Known Member
1. What is the neck thickness? Math. You are using a bullet of .308, and your total O.D. is .328. So you have .010 neck thickness. I didn't see where necks are trimmed for thickness. 10ths is on the very light side of necks thickness. Normally they say don't go under 12ths. A couple of things. You would want somewhere around .306 ID for tension. I don't know what your spring back is either. Let say your spring back is .002th. Case neck is .013th. So the math is. .308-.002=.306 ID for tension. Now .026 neck thickness. Perfect world your O.D. would be 0.332. That doesn't figure in spring back. You would have to sizes some case to see what that is. Your OD should be 0.334.
Something silly that has messed me up in the past, the screw that locks the comparator on my caliper was slightly loose, allowing measurements to grow. Couldnt see it or feel it, but numbers grew. Worth a check. Especially since all three guns have the same problem. Thats so unlikely, it leads me to the measuring tool instead.
SouthLoganCountyShooter
Well-Known Member
I did that. Lol screwed me all up in my head for days. Lol
SouthLoganCountyShooter
Well-Known Member
I did not see what bullet is being used.
I have 2 t3x superlite 300win. I can say this. In both of my rifles loading from mag length. In all 5 of my Tikka rifles, there's no way in hell. The bullet is touching lands with sierra hammer Barnes nosler bullets. I'd have to check my notes but there is a ton of free bore from mag length to lands on all 5 my Tikka rifles.
I have 2 t3x superlite 300win. I can say this. In both of my rifles loading from mag length. In all 5 of my Tikka rifles, there's no way in hell. The bullet is touching lands with sierra hammer Barnes nosler bullets. I'd have to check my notes but there is a ton of free bore from mag length to lands on all 5 my Tikka rifles.
I had this issue with ar15, even with lots of tension it grew .001 to .002, I figured from bolt slamming round in but on bolt action shouldn't be an issue, something's gotta be putting pressure on bullet to hold it and pull it out some when extracting, couldn't get my ar rounds to stop growing but it shot well so I stopped chasing this issue, lots of wasted rounds
According to Eric Cortina you can strip the bolt to find headspace, basically find where bolt drops down with no resistance, I don't see why you couldn't try the same thing and see if you feel resistance when dropping bolt, if you do then you know there is an issue with headspace or length, if no resistance then I can only think that you got no neck tension which you say is not the case, only thing else I can think is shoulder body junction is to big in diameter and being sized as you chamber causing overall growth but you would feel this I would think.
You could also try marking mouth and bullet with permanent marker and see if mark splits.
