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7mm stw vs 7mm rum?

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Unread 02-23-2008, 05:49 PM
Junior Member
Join Date: Feb 2008
Posts: 16
7mm stw vs 7mm rum?

new rifle build project. ballistically these look the same. in you guys opinion, does one offer more than the other?
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Unread 02-23-2008, 07:36 PM
Platinum Member
Join Date: Aug 2005
Location: Back in the south -NW FL..
Posts: 1,160
Their both BIG MEAN 7mm's.

The RUM offer a bit more case capacity.
AIPAC for president !!!!!!!!!!!!!!!!!!!
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Unread 02-23-2008, 09:01 PM
Silver Member
Join Date: May 2007
Location: California
Posts: 458
After studying ballistic and reloading tables, and consulting with Kirby Allen (see his posts on the subject), I decided to go with the 7 STW instead of one of the larger 7 Mags.

Bottom line: the bigger 7s are only recommended if you intend to shoot beyond 800+yrds, or if you just plain like the extra power.

FWIW several threads on another forum suggested that the 7 RUM was more finicky than the 7 STW about loads it shot well.
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Unread 02-23-2008, 10:35 PM
Platinum Member
Join Date: Jul 2005
Posts: 1,651
I believe you can get better brass if you go the 7mm STW route.

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Unread 02-23-2008, 10:39 PM
Silver Member
Join Date: Jan 2007
Location: Granbury, Texas
Posts: 318
I just love my 7MM STW. I plan on heading to the 300 and 400 yard range tomorrow to check my groups. On paper, IMR 7828 and 150 grn SMK's have been shooting .890 at 300 yards and my H-1000 and 140 grn Accubonds have been just truly amazing on animals. The farthest any animal I have hit with this gun has traveled was about four feet and that was because it stumbled backwards on the impact.
Founding member of the 7MM STW Club
Member Texas Cull Hunters Association
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Unread 02-23-2008, 11:24 PM
Platinum Member
Join Date: Jul 2004
Location: Texas
Posts: 6,875
The big advantage of the 7RUM over the 7STW is with heaver

If you intend to shoot 140gr bullets the STW will get within 100
ft/sec of the 7RUM but on 175gr bullets the RUM will have over
200 ft/sec more velocity than the STW.

I like and own both the STW and the RUM and they each have there
strong points.

My best load in the 7STW is a 140 Nozler partition @ 3450 ft/sec.

My best load in the 7RUM is a 160 accubond @ 3394 ft/sec.

I dont find the belt a problem so belt or beltless does not matter
to me.

The 7RUM has a 12% energy advantage over the 7STW and 24% over
the 7Rem Mag with a 140gr bullet and the wildcats blown out with
a 40o shoulder add more case capacity to shoot the realy big
7mm bullets (Like the 190gr).

I hope this helped
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Unread 02-24-2008, 11:13 AM
Platinum Member
Join Date: Dec 2001
Location: Long Island, New York
Posts: 2,422
I've been shooting the 7 STW for many years. My only concern was that quality brass was non-existent and I'm not interested in forming brass for this cartridge. Although, I must admit that I was able to get some very tight groups with fully preppped and sorted Rem brass.

Yesterday I noticed that Nosler is now making their "custom" brass in 7 STW. This could breath some new life in this old cartridge.
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