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Big Seven Case Capacities

 
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  #1  
Old 12-10-2003, 01:15 PM
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Big Seven Case Capacities

Later next year I'm thinking of doing a wildcat 7mm cartridge based on the 338 Lapua case. Does anyone know the water capacity of the various existing big sevens. Such as the 7 Rem Ultra Mag, Lazzeroni's Firebird and any others in that category.
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Old 12-10-2003, 02:46 PM
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Re: Big Seven Case Capacities

Len

You thinking of shortening it to make a Super "Short Magnum", or leave it full length?

Sounds like an interesting project, maybe I'll tag along and get one of these barrel burners... "Cut two (2) chambers please".
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Old 12-10-2003, 03:08 PM
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Re: Big Seven Case Capacities

Dave

Full length so I can use a bushel basket full of gun powder.

You're in. I know you need a new gun project about any time your check book balance gets too high.
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Old 12-10-2003, 04:21 PM
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Re: Big Seven Case Capacities

Len,

My 7 Ultra holds about 113gr water.

db
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Old 12-10-2003, 04:25 PM
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Re: Big Seven Case Capacities

Checkbook balance, any amount in the black is too much... I like 0.00 or a red balance... don't want to leave too much if I die.

What action you thinking about? Maybe we can get twins... I really want to try some of those high BC 7mm bullets. (If my friends could hear me now... "Dave with a 7mm... must have bumped his head pretty hard recently!"
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Old 12-10-2003, 05:31 PM
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Re: Big Seven Case Capacities

dbhostler

What velocities are you getting with the heavier bullets? Barrel length, etc? How do the published load/velocities compare to what you are achieving after adjusting for barrel length?

Dave

My Nesika Bay action with its HS Precision Pro Series tactical stock is already set up as a switch barrel gun so I will be using that. The BC of the Cauterucio 176 grain really is the high .750 claimed by Bob.
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Old 12-10-2003, 11:03 PM
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Re: Big Seven Case Capacities

Len,

Haven't worked with the heavy 7s too much. I picked up the Ultra later this year and began with a 140gr NBTs. Got those to shoot and then sent the rifle to Chris and had an OPS INC brake installed. The only thing I have at this time is 162gr A-Max with 96.0gr Retumbo lit by RP 91/2Ms for 3280fps. This is from a 26" factory bbl. As far as published data, most Ultra data is on the 30 and 338. Very little on the 7. If you can get "Speedbump" to chime in, he has shot the 7 Ultra in a match rifle for some time and has tried about every custom bullet and powder combo you can imagine. He is the one "in the know" on this subject. As a matter of fact, he necked down a 300 Ultra case and made a 7 Ultra before there was a 7 Ultra.

db
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