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-   -   7mm-08 specs (https://www.huntingnet.com/forum/reloading/300760-7mm-08-specs.html)

zrexpilot 08-19-2009 09:03 AM


Originally Posted by bigcountry (Post 3412461)
Hmm,thats not good. So your saying loading to 2.78", you see land marks on the side? Mossyoak33 was at my house one day with his 7mmmag, and I could feel some sort of imperfections in the throat using my stoney point tool.

Have you tried the split case method yet? Take a dremel and split the neck and tiny bit of the shoulders. Just enough tension to hold a bullet in place, and chamber and pull out and see?


Yep a 139 at 2.78 will leave marks on one side of the bullet right near the case neck and a 120 gr at 2.84 will not.

Explain the last part again, what is it you want me to look for, I did a spent case with a small crimp to check col, also marked the bullet, it does leave land marks but cleans one side of the bullet more.

bigcountry 08-19-2009 09:32 AM


Originally Posted by zrexpilot (Post 3412647)
Yep a 139 at 2.78 will leave marks on one side of the bullet right near the case neck and a 120 gr at 2.84 will not.

Explain the last part again, what is it you want me to look for, I did a spent case with a small crimp to check col, also marked the bullet, it does leave land marks but cleans one side of the bullet more.

Its kinda the same concept as the crimp. Except, the bullet can move but stay put when you "carefully" eject it. Sounds like you know where the lands are now. Honestly if I was you, I would just load to 2.75" and see what happens.

You sound like you maybe a lot like me and let things like this wrap you around the axle, and you get consumed. I know for years, I was consumed with runout and neck tension and neck wall thickness. I made reloading no fun. I kinda backed off, lowered my expectations for factory guns to 1MOA, even 1.5MOA for some guns and started shooting more.

zrexpilot 08-19-2009 09:41 AM

could this mean my chamber and barrell are off center by .0005

bigcountry 08-19-2009 09:46 AM


Originally Posted by zrexpilot (Post 3412716)
could this mean my chamber and barrell are off center by .0005

Could mean a lot of things. Could mean reamer chatter, could be, you just seated the bullet slightly crooked and its nothing. I wouldn't get too wound up. Only way to tell if its off is to have it casted, and I don't think you want to pour that amound of money into it.

zrexpilot 08-20-2009 12:35 PM

Pressed my 139,s in more, 2.753 and it still leaves a mark on one side of the bullet.
The marks are damn near the case.

Did some more checking, its not all the rounds doing it and the ones that do I spun the round and rechambered kept doing this and no matter what position it is in it hits in the same spot. so its the round itself that crooked somewhere. ?

bigcountry 08-20-2009 07:27 PM


Originally Posted by zrexpilot (Post 3414275)
Pressed my 139,s in more, 2.753 and it still leaves a mark on one side of the bullet.
The marks are damn near the case.

Did some more checking, its not all the rounds doing it and the ones that do I spun the round and rechambered kept doing this and no matter what position it is in it hits in the same spot. so its the round itself that crooked somewhere. ?

If the round is crooked, you can tell by rollling the loaded brass and see if the bullet wobbles or neck wobbles. Doing it over a mirror is even better.

zrexpilot 08-21-2009 05:54 AM


Originally Posted by bigcountry (Post 3414765)
If the round is crooked, you can tell by rollling the loaded brass and see if the bullet wobbles or neck wobbles. Doing it over a mirror is even better.

Yep did that and I have some wobbling, what Happened and how do I correct so It wont happen again, and will it affect accuracy, Im sure it will.

bigcountry 08-21-2009 07:07 AM


Originally Posted by zrexpilot (Post 3415056)
Yep did that and I have some wobbling, what Happened and how do I correct so It wont happen again, and will it affect accuracy, Im sure it will.

When you seat a bullet you want it to go in as straight as possible.

Here is what I have found. I found one culprit is slop in the shellholder. I put a post up on it a few years ago.
http://huntingnet.com/forum/reloadin...te-runout.html

Another thing I found is you can't correct runout much after its gone in more than 1/8" or less. So when you seat a bullet, you want to start right. So I rotate the case in the shellholder 1/3 at a time during seating. So you raise your ram until you feel the bullet slightly go in the case, lower the ram an inch or less, rotate another 1/3 turn, push the ram back up in the seater and seat another 1/8", or so, drop the ram and rotate another 1/3. It sounds like a lot but once you do it, it takes 5 sec.

I want to start posting some Youtube vids on this stuff.

zrexpilot 08-21-2009 12:20 PM

Thanks for all the info, that makes a lot of sense.
Just got back from the range and it definately makes a difference. Every round that had some run out was a flyer.
I found two loads that were some what promising, got 2" groups out of them, much better than the 4" I was getting with everything else.
Didnt seem to like the 120 gr, this gun has a 1 in 10 twist I was hoping it would like 120 gr'ers.
is that the wrong twist for 120's ?

bigcountry 08-21-2009 03:21 PM


Originally Posted by zrexpilot (Post 3415404)
Thanks for all the info, that makes a lot of sense.
Just got back from the range and it definately makes a difference. Every round that had some run out was a flyer.
I found two loads that were some what promising, got 2" groups out of them, much better than the 4" I was getting with everything else.
Didnt seem to like the 120 gr, this gun has a 1 in 10 twist I was hoping it would like 120 gr'ers.
is that the wrong twist for 120's ?


1 in 10 should be great for 120gr. I have 1 in 10 in my STW and it seems to like anything from 120 to 160gr. Not sure what my 7mm-08 has. My 7mmremmag is 1 in 9.25. All seem to handle 120's ok, but all loves 140gr best.

With those 120's try a different seating depth.


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