Neck Tension What Is Enough???

M

muzzle flash

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sw ont.
I just got some BARTS ultra 6mm. 68 gr. bullets. My 6mm. BR. is throated for the 107's. I found that to get this bullet to the lands I would have very little of the bullet seated in the neck. Is there a minimum amount a bullet should be seated into a case?? Or if it prints on paper give me my answer. I dont need to create myself any more problems with this rig.


THANKS.
 
In a perfect world, the bullet would be seated about one caliber into the neck.

However, in a single-shot bolt action, any amount of seating that produces accurate groups is good enough.

As for neck tension, about .002" of interference fit between the bullet and brass (eg, bullet is .224, inside of brass neck is .222) is ideal.
 
You could make-up a tool that seats the bullet hard into the lands, then load the charged case behind it, capped with a hard grease/soft wax wad.
 
Splatter said:
You could make-up a tool that seats the bullet hard into the lands, then load the charged case behind it, capped with a hard grease/soft wax wad.
Click to expand...
Or get a muzzleloader. :)
 
muzzle flash said:
I just got some BARTS ultra 6mm. 68 gr. bullets. My 6mm. BR. is throated for the 107's. I found that to get this bullet to the lands I would have very little of the bullet seated in the neck. Is there a minimum amount a bullet should be seated into a case?? Or if it prints on paper give me my answer. I dont need to create myself any more problems with this rig.


THANKS.
Click to expand...
I think you should stick with the 107's and sell me your Bart's Ultra's.;) I did a 10 twist BR so I could shoot lights up to about 95gr bullets. I got tired of switching loads and look like I am going to stick with 80 or 88 grain Bergers. I have a bunch of different bullets in the 60 grain category for testing when my 6PPC gets finished. I would sure like the Bart's that you have.;)


Calvin
 
"...get this bullet to the lands..." A 68 grain bullet won't have the same OAL as the longer, much longer, 107. Especially with a long throat. You might want to go rummage around 6mmbr.com though. Add the w's.
 
I don't know why everyone is telling him to switch bullets instead of addressing his question? I shoot 10-ogive 150s out of a .308 chambered more for 8-ogive 168s, so the bullets are seated shallowly. It shoots fine.
 
There is no definitive answer to this - whatever works in your gun, being handled by you in the situations in which it is used provides sufficient neck tension.

The context is not hunting, but as a case in point, my 35 Whelen has a throat long enough that if I seated a 250gr to the lands, I'd only have 0.150" of the bullet seated in the neck. I don't want bullets coming apart during handling, or in the mag in the field, so I seat them 0.100" off the lands, leaving 0.250" of bullet in the neck. Very accurate and provides a measure of assurance that the bullets won't budge that I value.

I'm guessing that 0.150" into the neck would be plenty for your 6mm if handled carefully and shot single-shot.
 
Breach seating has proven to be most accurate in old straight sided cases but is a pain in the butt....I wonder what would happen if you tried with all modern components.....I know the jacketed bullet would be pure hell to breach seat!!
 
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