Help with 6mm br loads.

[Wisconsinner]

I am pushing a 105 berger vld with 28.8 grains of varget, rem 7.5 primer,and Lapua brass which is new never resized.
While doing load development I saw that the primer started to crater around the area struck by the firing pin. It is a rem 700 action. Only getting 2,665 fps. Should I use different primers, and start over?
Any input is greatly appreciated. Thanks

 

[ShootDots]

No! Send your bolt to "Gre-Tan" and have him properly bush the bolt and it will eliminate that disconcerting phenomenon..

 

[Area Man]

Wisconsinner,

You sure the primer is cratering? Newer M700s have camfered firing pin holes that give the appearance of cratering.

 

[Wisconsinner]

I will try to add an image..

 

[timeout]

No! Send your bolt to "Gre-Tan" and have him properly bush the bolt and it will eliminate that disconcerting phenomenon..

+1
I am shooting about the exact load that you are in my 6 BR. I had some primer piercing show up (not with the Rem 7 1/2s however), sent the bolt to GreTan, problem solved. Top notch job and quick turn around time.

 

[Area Man]

The primer on the left is the result of a camfered firing pin hole.

 

[Wisconsinner]

That is what they look like, How much does it cost to have the bushing installed?

 

[spclark]

30.0 grains of Varget behind anything in the 105 - 107 grain weight range is kinda the Holy Grail load for 6BR.

As suggested, if you want to use something closer to this load that what you can presently use because the ''factory' bolt & firing pin is producing the cratering evident in that pic you posted, the GreTan bushed pin is your answer.

"Factory" tolerances are fine for rifles whose owners don't much give a darn. Closing up the too-large hole on your bolt, while at the same time reducing the FP diameter to 0.0625" or thereabouts will do wonders.

As for price; I had a Quadlite bolt done in 2009 & I think it was all of $75 plus shipping from me to them. Their website quotes $87 now, return shipping included.

 

[Wisconsinner]

Roger that! Thanks fellas! I absolutely love this round, Clays at 600 are no match, Just want to push the bullet a little faster......

 

[GSPV]

Just a word to the wise. When you load new Lapua 6 BR brass, you need to run it over a 6 mm mandrels and then through your FL die prior to loading he first time. The inside neck diameter on them is way undersized and results in hard seating effort and a buttload of neck tension.

 

[Lapua40X]

If my impression that you may be new to reloading is incorrect, forgive me for stepping on toes. But I gotta offer this advice.
NEVER accept someone else's load data as being valid for YOUR rifle.
I shoot about the same load you do with MV in the 2770 range. The results are excellent out to 800, very good out to 900, but it doesn't carry well in any wind beyond 900. On a perfect day it will shoot 1K - but a gust of wind kills it.
My chamber isn't your chamber, my seating depth is probably different, my neck tension is different and my brass (while it is Lapua blue box) is turned, trimmed and processed differently. Chamber pressures in your rifle will differ, sometimes dramatically, from other similar rifles. So just because I can shoot 29 grains of Varget with an OAL .012 off the lands doesn't mean it'll work safely and efficiently for you .
While I agree that the images posted suggest a firing pin issue and that a bushing should clear up the craters, I'd hate to think that you might interpret cratered primers as universally a non-issue.
https://www.google.com/search?q=blown+up+rifle&client=ubuntu&hs=EYM&channel=fs&source=lnms&tbm=isch&sa=X&ei=A4B9U6OLC8vMsQSkpYCYAQ&ved=0CAgQ_AUoAQ&biw=1231&bih=917#facrc=_&imgdii=_&imgrc=5HqC4os4j89jbM%253A%3BhrqBnBfbADMRzM%3Bhttp%253A%252F%252Fwww.24hourcampfire.com%252Fubbthreads%252Fubbthreads.php%252Fubb%252Fdownload%252FNumber%252F15192%252Ffilename%252F07R.JPG%3Bhttp%253A%252F%252Fwww.24hourcampfire.com%252Fubbthreads%252Fubbthreads.php%252Ftopics%252F3614485%252F6%3B820%3B615

 

[timeout]

I agree with Lapua40X, but have to ask - Why are you showing us photos of .270 brass when you have asked about a 6 BR? What part of WI. are you located in? I am in SW WI.

 

[Area Man]

I posted the picture, not the OP. There is no "issue" with the firing pin on my M700. The firing pin hole is camferred by the factory.

To Wisconsinner: I wouldn't worry about it. A hot load will produce a visibly flattened primer. The edges won't be rounded off and the entire face of the primer will flush with the pocket.

I would consider bushing the firing pin hole when I got to the point of trying to tweak the last remaining bit of accuracy from a very accurate gun.

 

[timeout]

I posted the picture, not the OP. There is no "issue" with the firing pin on my M700. The firing pin hole is camferred by the factory.

To Wisconsinner: I wouldn't worry about it. A hot load will produce a visibly flattened primer. The edges won't be rounded off and the entire face of the primer will flush with the pocket.

I would consider bushing the firing pin hole when I got to the point of trying to tweak the last remaining bit of accuracy from a very accurate gun.

My mistake. I read where he was going to try and post pictures. Sorry! :-[