8mm Gibbs - The tools of the trade - Metallic cartridge reloading

The Handloaders Bench > Metallic cartridge reloading > The tools of the trade > 8mm Gibbs

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8mm Gibbs

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Posted: Wed Jul 4th, 2007 03:59 PM

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Mike Graham
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I just picked up a 8 mm Gibbs, Huski res., bruno barrol. I need to know how hot I cann make my loads @ any tricks I may need to Know. I have been punching out my 30.06 brass. Any info would be helpful.

Thanks Mike

Posted: Sun Jul 8th, 2007 12:28 AM

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72coupe
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What exactly is 8MM Gibbs?

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Posted: Mon Jul 9th, 2007 10:09 PM

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ohiococonut
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It looks much like a .30-06 AI but uses a .323 dia bullet and has a sharper shoulder. My Handloaders Manual of Cartridge Conversions says it made by taper expanding the neck to .330" and full length sizing in a Gibbs die. Square the mouth, chamfer and fireform in a Gibbs chamber. I think it was a collaboration between Ackley and Gibbs and although the case only gains 5.44gr in capacity there's about a 500fps gain in velocity using a 170gr bullet.

It's "almost" identical to the 8mm/06 Springfield Improved made by PO Ackley. There's only about 1/2 degree difference in the shoulder angle and .11" difference in the length to the shoulder. Both cases are the same length and the case body taper is so slight I don't think it can be seen with the naked eye. I doubt you could tell the difference between cases without taking a mic to them.

Last edited on Mon Jul 9th, 2007 10:10 PM by ohiococonut

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Posted: Mon Jul 9th, 2007 10:29 PM

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72coupe
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Sounds like a good solution to a nonproblem.

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Posted: Tue Jul 10th, 2007 12:18 AM

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sdb777
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Well, in that case(no pun intended), I'd start with loads listed for the 8mm-06 and work toward the goal that you are intending to get with this cartridge.

+1 for the solution to a non-problem.

Scott (why did you get that cartridge?) B

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Posted: Thu Jul 12th, 2007 03:52 AM

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strait shooter
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ditto on the 8-06 data. I load a 8-06 k.kale w/29" barrel. It's pushing a 180gr nosler /med load at 2850 using Imr 4064 pwdr. groups at 3 shots in 1.5" at 150 yds. Good enough I think for hogs here in norcal. Dave :cool:

Posted: Tue Jul 17th, 2007 02:23 PM

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Mike Graham
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Giggs was a visionary who wanted to use 30.06 cases to what he felt was there full potential. In this case they are fire formed to the chamber size to hold more powder and neck sized to accommodate the larger 8mm bullet. Because of the collaboration between Bruno @ Husky This makes a great rifle with no shortage of brass.

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The Handloaders Bench > Metallic cartridge reloading > The tools of the trade > 8mm Gibbs

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