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Need help - ideas to push RUM shoulder back

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10 March 2005, 02:54
Andy_P
Need help - ideas to push RUM shoulder back
I am trying an experiment that requires the shoulder of the 338 RUM to be pushed back about 0.175". I have tried:

a. a 325 WSM die (35 degree shoulder) and the case crumpled;

b. I annealed the shoulder area, tried "a." and it crumpled easier; and

c. I tried reducing it a bit with 300 Win Mag, then 30/06 and then 35 rem, which takes a long time and produces "steps" then "a.", and it crumpled.

Seems I need to reduce it in at least one stage before I can use the 325 WSM die, but problem is, "with what?". A 375 RUM, then 338 RUM?

Any ideas will be appreciated.


Andy

Since 1958

www.8mmARPWildcat.pridham.ca
www.8x63swedish.pridham.ca
10 March 2005, 03:48
Paul H
Is this new or fired brass? I find new brass is much friendlier in regards to setting back the shoulder, even friendlier than anealed fired brass. Once you fire brass and oringal slightly rounded shoulder transitions get "ironed" into the chamber, the brass is much tougher to fiddle with.

With a case as large in dia as the RUM, you'll need to push the shoulder back in stages. I'd say run the case through a 45 caliber die, then 40 cal, then 375 cal. then .338 die.


__________________________________________________
The AR series of rounds, ridding the world of 7mm rem mags, one gun at a time.
10 March 2005, 13:17
460wby
I dont know, but maybe a 404 Jeffery die-set will do it?


*Treat problems like a dog; Take a sniff ..... If it can't be killed, eaten, or fucked? Just pie on it, and walk on!:-)

Arild.
10 March 2005, 16:13
Andy_P
Thanks guys. Actually I woke up this morning with another answer and it worked.

Anneal the upper case and then run it into first a 8x50R (8mm Lebel) die, and then the 325 WSM. The 8mm Lebel has a wide base and a nice taper - and it's cheap to buy from Lee. Redding makes the 325 WSM die. It's an 8mm case I'm trying to form, hence the "8mm solution".

Fireforming will complete the operation.


Andy

Since 1958

www.8mmARPWildcat.pridham.ca
www.8x63swedish.pridham.ca
11 March 2005, 07:25
jeffeosso
Andy,
of course, sizing them out to straight and back down will work..

jeffe


opinions vary band of bubbas and STC hunting Club

Information on Ammoguide about
the416AR, 458AR, 470AR, 500AR
What is an AR round? Case Drawings 416-458-470AR and 500AR.
476AR,
http://www.weaponsmith.com
11 March 2005, 07:54
MartytW
Surprised to hear it took that much effort to find a solution, I take the 300 RSAUM and in one stroke with the big BMG press turn it into 300 WSSM with no failure, just a need to trim about 0.5" of the case ..... Imperial wax seems to make life a lot easier ...


Marty ter Weeme
Teppo Jutsu LLC
Home of the .458 SOCOM
www.teppojutsu.com
11 March 2005, 11:15
Bwana-be
So, whatcha up to?
Necking down to .308" and trimming to 300 Win length?
14 March 2005, 22:33
Sabot
Just grind .175 off the base of a 338 RUM die and have at it.