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Why 7STW over 7RUM?

 
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  #22  
Old 05-08-2013, 08:03 PM
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Re: Why 7STW over 7RUM?

The biggest reason I bought another 7stw after I tired the current one and I didn't replace the 7rum I had(even though it was a long range hammer) is barrel life. Both were very shootable, with 3 shot groups in the .3" 100 mark and in the .9" range for 5 shot rapid fire, but the 7 rum crapped out( group size doubled) at 600 rounds and the 7stw was still going strong well over the 1000 round mark; I was at about 1,400 rounds and when I changed the scope to trade her she settled in at .4" at 100 after she was sighted.
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  #23  
Old 05-18-2013, 05:54 AM
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Re: Why 7STW over 7RUM?

The Stw is the reason the Rum even exists. When the stw came out, it caused the rifle companies to wake up and notice that there was room for a faster 7mm. After researching its ballistics and reading the results of accuracy at long distances, I had to have one.
The developer of the stw stayed with a belted case for good reason. It provides longer case life, more consistent loads and better availability of cases.
To go from an Stw to a Rum only gains 100 fps or less. The Rum is very finicky with a huge appetite to boot. I enjoy the velocities and trajectories of the Stw and here's the thing...it is so predictable!
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  #24  
Old 05-18-2013, 07:39 AM
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Re: Why 7STW over 7RUM?

hey dont forget there are a couple other good 284s.
one has been around longer than the stw and produces about same results.
simply neck down the 300 weatherby for a 7x300 wby. ive had one for over 40 years.
the other is bruce baers version using the 340 wby case.
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  #25  
Old 05-18-2013, 08:10 AM
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Exclamation Re: Why 7STW over 7RUM?

The 7 mm RUM is really the better choice of the Hyper Velocity 7mm caliber. The REAL problem is it came out to soon. When Berger, or if Berger releases its 195gr 7mm projectile and when RL33 comes more readily avail along with Vita Vouri H570 I assure you the ballistic differences will be readily apparent. The RUM should be chambered in a Very hard barrel like a Lothar Walter and be stressed relieved with a minimum length of 28 inches up to 34 inches. If a rifle was built but a knowledgeable smith it would out perform all other 7mm cartridges. My fear once this technology comes apparent to the rest of the world the rifles chambered for the Rum will have the wrong twist rate and wrong throating to work in harmony with what I described above. I have built 2 of these rifles and can say not much will run with them. Only the BIG 338s will best them. Check out the projected claim of the 195gr Berger 7mm and run some number of this at 3200 fps. And that load is lazer flat and hard hitting at 1000+ yds. Compare this to the 30-378 or any other and tell me what you think!

Last edited by idaho elk hunter; 05-18-2013 at 08:14 AM. Reason: spell check!
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  #26  
Old 05-19-2013, 01:04 PM
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Re: Why 7STW over 7RUM?

I think I might venture into the realm of the 7RUM......I'll never part with the STW, but my local store has a very slightly used 7RUM 700 BDL that I can get for under $500. And if I don't like it I can simply rebarrel it to another STW.
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Quote:
Originally Posted by WildRose View Post
The 284 is to the STW what a tricycle is to a Ninja.
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  #27  
Old 05-19-2013, 02:09 PM
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Re: Why 7STW over 7RUM?

Quote:
Originally Posted by idaho elk hunter View Post
The 7 mm RUM is really the better choice of the Hyper Velocity 7mm caliber. The REAL problem is it came out to soon. When Berger, or if Berger releases its 195gr 7mm projectile and when RL33 comes more readily avail along with Vita Vouri H570 I assure you the ballistic differences will be readily apparent. The RUM should be chambered in a Very hard barrel like a Lothar Walter and be stressed relieved with a minimum length of 28 inches up to 34 inches. If a rifle was built but a knowledgeable smith it would out perform all other 7mm cartridges. My fear once this technology comes apparent to the rest of the world the rifles chambered for the Rum will have the wrong twist rate and wrong throating to work in harmony with what I described above. I have built 2 of these rifles and can say not much will run with them. Only the BIG 338s will best them. Check out the projected claim of the 195gr Berger 7mm and run some number of this at 3200 fps. And that load is lazer flat and hard hitting at 1000+ yds. Compare this to the 30-378 or any other and tell me what you think!

The 195 berger may make a difference; rl33 will not. The 7 stw is already capable of using 50 bmg type powders like rl50 and I 5010. The extra powder capacity is a moot point. 86 grains rl50 in my 7stw will break 3100 fps with a 171 in a 24" barrel. Kick the bbl length up to 28" and I'd be closer to 3250-3300 fps with a 171.
As far as the "hard barrel" if I were to chamber a 7stw in the same barrel make as your 7rum I'd still see twice the barrel life at around 100 fps velocity drop (if that). Apples and apples please.
I do like the 7rum and may own another eventually but it is really an over design with little benefit over the stw other than it gets rid of the belt. The drop in bore life with the 7rum is a non issue for some, but I don't like the idea of playing with a new barrel every couple of years.
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  #28  
Old 05-20-2013, 09:18 AM
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Re: Why 7STW over 7RUM?

Quote:
Originally Posted by Lefty7mmstw View Post
...if I were to chamber a 7stw in the same barrel make as your 7rum I'd still see twice the barrel life at around 100 fps velocity drop (if that).
Really? I didn't think the barrel life was that different between the two. I have heard approximately 1,000 rounds in a 7RUM, so you think you can get 2,000 in the STW?
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