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Case capacity gained with improved cartridges

 
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  #1  
Old 01-09-2004, 11:58 AM
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Case capacity gained with improved cartridges

After doing some more careful measuring, it looks as if my 7 Lapua Improved project will net me somewhere around a 6 grain increase in nominal powder capacity over that of a 7 RUM. That's good enough for me, especially with the advantage gained in brass quality.

The increase gained with the various 30/338 Lapuas of our members over the parent case seems to be somewhere around 7 grains. I would be most interested to learn of the amount of gains achieved with other common "improved' cartridge projects. Who has good data on the 300 Tomahawk project, before and after?
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Old 01-09-2004, 04:44 PM
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Re: Case capacity gained with improved cartridges

Len

Tomahawk #1 can give you more info on that.
He and Ray Romain was instrumental in the design of that one.
I simply used the reamer that was ordered.

The neck jucture looks the same length but the shoulder is blown out and the shoulder angle is 35 degrees.

Tom #1 will be around soon I'm sure.

Later
DC [img]images/icons/smile.gif[/img]
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Old 01-09-2004, 06:07 PM
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Re: Case capacity gained with improved cartridges

Len

The shoulder on the 300 ultra is .520 and the shoulder on the Tomahawk is .535 which gives you a 5 degree body taper with a 35 degree shoulder. Neck length is .286
Hope this info helps with your reamer development

Tomahawk#1
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Old 01-09-2004, 06:47 PM
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Re: Case capacity gained with improved cartridges

Tomahawk

Thanks!

I assume the shoulder/body junction had to stay where it was?
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Old 01-09-2004, 07:17 PM
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Re: Case capacity gained with improved cartridges

Len,

What powder are you planning to burn in this really big 7mm case?

Are you planning on having a long neck on the case to keep the throat from buning out or counting on really slow burning powder to help out with that problem?

I have read some posts on here on LRH.com about rapid throat errosion with the big 7mms.

Just wondering if you had a plan in the design of this case which would help this issue out.

Doug
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Old 01-09-2004, 07:55 PM
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Re: Case capacity gained with improved cartridges

dwm

I'll use one of the slowest powders, of course. And I'll just re-barrel every few hundred rounds. [img]images/icons/smile.gif[/img]
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Old 01-09-2004, 08:37 PM
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Re: Case capacity gained with improved cartridges

Len,

if you want to increase the capacity and are looking for a big "improvement", just increase the diameter at the shoulder and you'll gain a ton more than all this 40 degree crap. (do that too) Do away with all but about 3-4 thou of taper per inch and the cases wil eject just the same and the capacity will be LOADS bigger.
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