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Hot 6mm Rounds

 
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  #8  
Old 01-25-2009, 11:34 PM
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Re: Hot 6mm Rounds

Just rigged up a 6mm-06 Ackley by shoving a 25-06 case into my 6mm Ackley die. Looks pretty sweet even though the shoulder is all weird and radiused and the neck is too long. Definitely holds more than the 6mm Ackley now, and has tons of room to be blown out.
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  #9  
Old 01-25-2009, 11:47 PM
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Re: Hot 6mm Rounds

Dave, A 1-8.5 twist would be right on. Mine are 8 and 9 twist in the following rifles and they shoot the 105 matchking very well. The 240 Gibbs has a .270 tight neck on it and 60 grains of 7828 pushes it 3588 fps. My 240 wby is also a .270 neck with no freebore and 57 grains of 7828 pushes the 105 at 3569. My 6mm-06 IMP pushes the 105 3255 fps with 55.5 grains of 7828. My 6mm-284 pushes the 105 at 3286fps with 56 grains of winchester MRP. My 243 AI is right in that area and I will get you that load when I get back down to the bench. For some reason it is not in here. The wby and the Gibbs are by far the fastest ones. I have some 70 grain ballistic tip loads at over 4100 fps and the 55 BT at over 4300 fps. They are awesome on prarie dogs and coyotes.
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  #10  
Old 01-26-2009, 01:21 AM
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Re: Hot 6mm Rounds

LTLR can you tell me more of the Gibbs cartridges? How are they formed, where do you get reamers, dies, is brass formed from 25-06, 270, 280, 30-06, sorry, I am new to the wildcatting scene.
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  #11  
Old 01-26-2009, 11:55 AM
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Re: Hot 6mm Rounds

Rocky Gibbs started the gibbs line out of Lewiston Idaho I believe. They have been around for many years and I don't know why they didn't gain more popularity. Some didn't like the short necks which are only about .25 inches. The Gibbs are all you can get out of a blown out 30'06 case. I have all the Gibbs from 6mm to 338 caliber and all of them will shoot right with the standard magnums with less powder, recoil, noise, etc. In other words 240 gibbs=240 wby, 264 gibbs=264 win mag, 7mm gibbs=7mm rem mag. 30 gibbs=300 win mag, 338 gibbs=338win mag. The = just makes it easier to type, they are not equal but are very close to these magnums. Close enough really that a big game animal would not know the difference and neither would the shooter. RCBS makes dies for them but I just use the generic hornady neck dies. You can rent the reamers which is what I did. Brass is very easy to form and they are easy to load for. Use 25-06 brass for the 240 and neck size it until the bolt closes easily. In other words you are using the caliber difference to headspace the cartridge so you don't get any stretch. You want the 6mm-25 caliber step up to fit snug but not tight in the chamber. Load and fire and you then have a 240 gibbs. I use 30-06 brass for the 7mm and 35 whelen brass for the 30 and 338 gibbs. For comparison to the magnums my 338 gibbs shoots a 200 grain ballistic tip 3065 fps which is about the same as a 338 winchester magnum but you don't have the recoil of the 338 winchester.
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  #12  
Old 01-26-2009, 06:52 PM
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Re: Hot 6mm Rounds

240 or 264 Gibbs looks like the way to go off a standard bolt face which I'd like to stick with!

PM me if there's any way I can get a dummy of these two cartridges from you.
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  #13  
Old 01-26-2009, 11:21 PM
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Re: Hot 6mm Rounds

No problem getting you a dummy round. The 30 gibbs is actually the duplicate of the 300 wsm velocity wise and just behind the 300 win mag. My 264 gibbs seems to do best with the 120 ballistic tips at nearly 3300 fps. In the 240 gibbs 71 grains of winchester mrp shoots the 55 grain ballistic tip at 4319 fps accurately which is awesome on varmints. 68 grains of the same powder will get the 70 grain BT over 4100 fps. They are fun to play with.
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  #14  
Old 01-27-2009, 08:18 AM
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Re: Hot 6mm Rounds

PM sent.
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