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Reloading Techniques For Reloading


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Too much jump?

 
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  #8  
Old 08-07-2013, 11:38 AM
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Join Date: Aug 2013
Location: West Central, Idaho
Posts: 437
Re: Too much jump?

Quote:
Originally Posted by Mikecr View Post
Is your setting putting bullet bearing into neck-shoulder junction?
Forgive my ignorance but I don't quite understand that question. I'm a noob to reloading. I understand the neck-shoulder junction, not positive on the bullet bearing; is that where the lands first contact the bullet?

I just measured my overall length that my gun could handle, 3.441 bullet in the lands. The recommended overall length in the berger manual, 3.290 is yielding a jump of .151 already. Now as I understand it I need to set the bullet in the lands and work back per the berger manual, which suggests anything from touching to .150 off the lands.
if my groups keep getting better further back at what point do you stop? Is there such a thing as too much jump IE never go more than .XXX off the lands?

I am contemplating taking the HSM ammo and pulling the bullets, then re-seating them from on the lands to the recommended COAL in the berger manual. Would I have any problems with this method? I would think seating the bullet longer than the HSM coal would be fine i.e. no pressure problems. Now seating the bullet deeper from the HSM Coal; would that create more pressure and not be advised? It would look like this.

HSM AMMO 66.0gr (?) not sure what they use for powder primer.
3.291 (-.060) ---berger recommended coal
3.311 (-.040)
3.351 (0.000)---HSM stock coal
3.391 (+.040)
3.431 (+.080)
3.441 (+.090)--- rifle max coal

I'm shooting a handload at 3.290 and it shoots very nice. The only data I'm trying to gather from the above test is to see if the HSM ammo, which is mediocre in my rifle, gains any accuracy that is consistent with the coal that I'm seeing with the handloads. This should give me an idea of where my gun likes the berger bullets. So that when I begin handloading I will know where to start with seating depth. Plus I had two boxes of HSM ammo I need to shoot up.

The COAL of the HSM ammo happens to fall in line with the seating depth test that burger recommends performing in the rifle.

I hope this is not too confusing and I can get an answer. I hope I'm not showing my ignorance.

Thanks, Jake
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  #9  
Old 08-07-2013, 12:08 PM
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Join Date: Dec 2011
Location: S.E. Michigan
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Re: Too much jump?

If you pull them you have to resize the neck, bullet tension will be lost.
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  #10  
Old 08-07-2013, 12:24 PM
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Join Date: Aug 2013
Location: West Central, Idaho
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Re: Too much jump?

Quote:
Originally Posted by SidecarFlip View Post
If you pull them you have to resize the neck, bullet tension will be lost.
Stock HSM neck diameter .309
HSM pulled and reseated dia .309
Fired brass neck dia .313

With neck diameters being equal would I still have lots of neck tension?
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