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7 mm lrm

 
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  #15  
Old 06-13-2014, 05:16 PM
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Join Date: Dec 2011
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Re: 7 mm lrm

Thanks guys! Lets keep running the 7's, mines still hammering the 190's. I'm kinda considering the 7x300 Norma, just for giggles. I think running a 180-190 @ 3300+ would rock!
Chris
Benchmark Barrels
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  #16  
Old 06-14-2014, 02:45 AM
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Join Date: May 2011
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Re: 7 mm lrm

Love reading these threads on all the different 7mm wildcats you guys play with. Out of curiousity, it seems like not many people shoot the 7mm rem ultra mag... you all seem to shoot stw's, rem mags, dakota, wsm's, 7/300wm, 7lrm, etc. maybe i just miss threads about the 7 rum, or is there something you guys don't like about it?
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  #17  
Old 06-14-2014, 08:49 AM
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Re: 7 mm lrm

Since I don't have the background a lot of these folks do I won't go into any detail but I think the reason the 7mm RUM isn't considered too often is because it is somewhat (significantly?) overbore. In other words, the case holds more powder than can be efficiently burnt in a 7mm bore barrel even if the barrel is 28+ inches long. The increased performance of the 7mm RUM comes at a cost as the overbore decreases the life of the barrel, at the throat, more rapidly than other more efficient chamberings. From the research I've conducted it seems the performance vs barrel wear isn't a worthwhile tradeoff unless you really want, or need, every last fps of muzzle velocity.
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  #18  
Old 06-14-2014, 09:02 AM
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Re: 7 mm lrm

I had three 7 RUMs. A Sendaro, a LSS and one I had installed on a Rem 700 using a PT&G reamer. The last one was used for a head to head comparison with a 7 STW both made on Remington takeoffs formerly in 7 Rem mag. Just like the Sendaro and LSS the two comparison barrels were 26" long.

I used 168 gr bullets in the STW and RUM. With max safe loads the RUM beat the STW by 50 fps. I concluded that the 7 RUM is best served with a 30" or longer barrel.

Other considerations with the 7 RUM:

The factory chambering has a very long throat. The round won't fit past the feed rails of model 700s that were not made for a RUM case. Barrel life is fairly short and it has the most recoil.

I will say it was easy enough to find accurate loads for all three. Two of my friends bought the Sendaro and LSS and are happy with them. They only shoot them on hunts.



I am currently experimenting with a 7mm/375 Ruger and 180s.
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  #19  
Old 06-14-2014, 09:18 AM
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Re: 7 mm lrm

Very Interesting. So the RUM is just a huge case for 7mm bullets. I wonder if this speculated 7mm 195 Berger bullet that people have been buzzing about is going to drive more guys to the RUM case and 30" barrels to get velocity up?
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  #20  
Old 06-14-2014, 02:09 PM
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Re: 7 mm lrm

Quote:
Originally Posted by Timber338 View Post
Very Interesting. So the RUM is just a huge case for 7mm bullets. I wonder if this speculated 7mm 195 Berger bullet that people have been buzzing about is going to drive more guys to the RUM case and 30" barrels to get velocity up?
I doubt it! Efficiently is where it's at! A person can only burn X amount of powder in X case for X bullet. I have had dealings with the 7rum an as big of a fan as I am of the 284/7mm caliber an the RUM family the 7mm rum is IMO is a waste of case an powder! I've owned four of them, two I had rebarreled, one I traded, the other one just out an out got rid of because of(1) recoil!(an I'm really not recoil sensitive)(2) couldn't get it to shoot! The owner of it finally rebarreled it! All in all I love a 7mm remington mag, STW an 7/300! Don't know about the 7 Dakota,7/375 ruger. My vote goes to the 7/300 for efficiently an performance in a 7mm!!! NOT SAYING ANYTHING AGAINST THE STW!! Just my choice!! Sorry to get long winded!!

DT
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  #21  
Old 06-14-2014, 02:46 PM
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Re: 7 mm lrm

Quote:
Originally Posted by Dick Tinsley View Post
I doubt it! Efficiently is where it's at! A person can only burn X amount of powder in X case for X bullet. I have had dealings with the 7rum an as big of a fan as I am of the 284/7mm caliber an the RUM family the 7mm rum is IMO is a waste of case an powder! I've owned four of them, two I had rebarreled, one I traded, the other one just out an out got rid of because of(1) recoil!(an I'm really not recoil sensitive)(2) couldn't get it to shoot! The owner of it finally rebarreled it! All in all I love a 7mm remington mag, STW an 7/300! Don't know about the 7 Dakota,7/375 ruger. My vote goes to the 7/300 for efficiently an performance in a 7mm!!! NOT SAYING ANYTHING AGAINST THE STW!! Just my choice!! Sorry to get long winded!!

DT
I think we all can sit around and talk about this stuff all day... not possible to get long winded! Very interesting that the 7's just don't need that much case capacity. Remington must not have done the research into the design... where the 300 rum is the start of where you get benefit from the big case, and the 338 obviously shines as well.

I'm actually looking into going to a small little 7mm-08, I think it would make for a great hunting rifle for my two young sons to start out on and for my wife, and then be a great target/range/practice gun for all of us. Not a LR hunting setup, but a very handy, low recoiling rifle, and I also think inherently accurate and extremely efficient.
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