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#292614 - 07/08/07 08:18 PM what kinda speed could be ?
pety221
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Registered: 02/18/06
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me an a freind were talking the other day
if u take a 7mm rum an necked it down to 6mm what kinda speed would it be running when it left the barrel ?
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#292620 - 07/08/07 08:26 PM Re: what kinda speed could be ? [Re: pety221]
.444 Marlin
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Registered: 08/10/02
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Loc: Benton, Polk Co. Tenn.

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Depends on the bullet weight and barrel length.
100gr....roughly 3450-3600fps if you could get all of that powder to burn.
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#292623 - 07/08/07 08:31 PM Re: what kinda speed could be ? [Re: .444 Marlin]
Sniper
TnDeer Old Timer
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Registered: 03/09/99
Posts: 5670
Loc: East TN

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I would say you would be in the 3800-4000 range but your barrel is not going to last long. I would say after 300 rounds you may see an accuracy loss. Would probably need a 28-30" barrel to get the max velocity.

If I did not already have a 257 Weatherby the 257 STW might be interesting, I have not fooled around much with anything less than .25 caliber.


Edited by Sniper (07/08/07 08:33 PM)
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#292632 - 07/08/07 08:45 PM Re: what kinda speed could be ? [Re: Sniper]
.444 Marlin
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Registered: 08/10/02
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Loc: Benton, Polk Co. Tenn.

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What would be really nasty is necking a .338RUM down to 6mm........
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#292962 - 07/09/07 08:33 AM Re: what kinda speed could be ? [Re: pety221]
TiminTN
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Registered: 06/18/00
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Loc: Memphis,Tennessee U.S.A.

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I think the 06 case is plenty big for that bore. The 240 Weatherby is equal to the 6mm/06. I have a wildcat off the 338 RUM case and it is necked to 7mm. I think that case is a better choice than the 7mm RUM.
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#292974 - 07/09/07 08:47 AM Re: what kinda speed could be ? [Re: TiminTN]
.444 Marlin
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Registered: 08/10/02
Posts: 15368
Loc: Benton, Polk Co. Tenn.

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 Originally Posted By: TiminTN
I think the 06 case is plenty big for that bore. The 240 Weatherby is equal to the 6mm/06. I have a wildcat off the 338 RUM case and it is necked to 7mm. I think that case is a better choice than the 7mm RUM.



And I still dont know what the difference is between a 7mm/338RUM and a 7mmRUM.
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#293190 - 07/09/07 01:12 PM Re: what kinda speed could be ? [Re: .444 Marlin]
TiminTN
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Not much. The 338 RUM case is .090" shorter. This allows a properly set up reamer, cut a chamber to have a loaded round be able to fit the magazine AND reach the rifling. This is not possible on a 7 or 300 RUM.
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#293192 - 07/09/07 01:15 PM Re: what kinda speed could be ? [Re: .444 Marlin]
Whelen Man
TnDeer Old Timer
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Registered: 03/12/99
Posts: 2327
Loc: Athens, TN, USA

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The 338 RUM has a slightly shorter length to the shoulder than the 300 RUM. It supposedly had to do with the bullet seating depth for the heavier 338 caliber bullets to be seated out long and still work in the standard length action.

Tim you beat me to the draw on this one.


Edited by Whelen Man (07/09/07 01:18 PM)
Edit Reason: Tims too fast
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#293549 - 07/09/07 05:51 PM Re: what kinda speed could be ? [Re: ]
pety221
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Registered: 02/18/06
Posts: 4561
Loc: whitwell

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DA what u building ?
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if ure gonna go go all the way if ure gonna stay then stand ure ground if u cant run with the big dogs then big dog let me walk u out !!
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