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7mm Rem Mag or 7mm Ultra Mag???

 
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  #8  
Old 01-08-2010, 08:13 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

Topshot, Definitely the Sendero. It has the best stock of the Rem rifles IMO, unless you dont like the HS aluminum bedded stcks. I like the older SF stocks better then the newer SF II stocks. The new ones have a wider beavertail forearm and palm swell. Maybe you might like them?

Sambo brings up a good point about the twist and the 180 VLDs. Berger recomends a 9 and the Rem's are a 9 1/2 for the RUM and 9 1/4 for the RM. The extra velocity should make up the twist dif between the RUM and RM. There are some guys shooting the 180's out fo their factory barrels, hopefully they will chime in. I asked this question a while ago and a couple of guys ran the numbers in their quick load and said the 180's should stabilize out of the RUM, but i think we were assuming a vel of about 3300.

Mark
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  #9  
Old 01-08-2010, 09:31 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

I have a Sendero SFII that was customised into my .338 Edge so am familiar with the stock but I am after a lighter rifle than the Sendero for back packing.

I see in the 2010 Remington web site that the SPS Stainless in 7mm RUM has a twist rate of 9.25 and the Sendero has 9.5.

What would be the minimum velocity that a 180gn Berger would expand on large game with a chest shot?
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  #10  
Old 01-08-2010, 09:43 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

Berger advertises 1800 fps
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  #11  
Old 01-09-2010, 06:13 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

I got 3100 with the 180 Berger VLD from a 7 Rem Mag but the barrel is 30" long. (68 grs of RL-25 in a 1 in 7 twist, 3 groove lilja)

Very recently I found a "like new" model 700 7 RUM in the used rack. It was an older LSS. It was produced in 1998. I also found that Rem lists two twist rates for the 7 RUM, either 1 in 9.5 or 1 in 9.25. I moly coated the bore then began shooting moly'ed 180 VLDs. I worked up to 90 grains of RL-25 with 90 grs making tiny clusters with a hint of bolt lift. I backed off to 89 grs for a velocity of 3100 fps from the 26" barrel.

Based on my experiences with three 7 RUMs you run into pressure with the 180 VLD right around 90 grs of RL-25/3100 fps with a 26" barrel.( I checked my notes) I can't imagine how anyone could get 3250 unless they had a much longer barrel, which the 7 RUM should have IMO.

Get the 7 RUM, don't worry about recoil, it isn't bad at all. The recent LSS was 8 3/4 lb after hollowing out the laminate stock and putting on a 4-12 leupold was very tolerable.
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  #12  
Old 01-09-2010, 07:32 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

Good Morning, top shot.

As you know I have the 7MM RM. I'llet you know how the new T3 shoots on Wednesday.
The 7mm Rum is wicked but be aware my last SPS in 300 win mag after Hamsie bedded it and installed pillars would shoot nearly two touching and the 3rd opens up slightly high and to the right. Thats still pretty good from a factory stock tube!

With the 7mm RM you can get lots of different brass including Norma quite reasonably and Ridge Rider has a good source. I'll see how the hand preped Remington cases go first and weather I am happy with my efforts.

If your Edge is anything to go buy do you need a 7mm RUM in reality ? Light weight is the key into those back areas we go and since you have a heavy hitter and I know you have a Lilja on order will the 7mm Rem mag do it? Tough one.. I suppose you can buy one in 7mm RUM and tell us all about it! HA HA. I suppose Grey Bull and Best of the West chamber in 7mm RM for a reason.. You wont need a brake either.

Since you will ALWAYS HAVE 2ND THOUGHTS go the 7mm RUM . Light Palma Contour DE brake and B&C vertical tactical pistol grip stock. 26inches max length
This should weigh as much as my Accumark which is bareable covering those Valleys.

Beside you can always make your 25/06 a 7mm
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  #13  
Old 01-09-2010, 10:54 PM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

Signature542,

Good luck on Wednesday, the weather should be a bit cooler by then and it should be a pleasant day.

The 7mm RUM is just such an impressive beast, I'm just gunna have to get one and run it in tandem with the .338 Edge and find out how impressive.
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  #14  
Old 01-10-2010, 05:33 AM
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Re: 7mm Rem Mag or 7mm Ultra Mag???

I get 3000 fps with a berger 180 with retumbo out of a sendero sf11 7rm. I hope I get more than 3100 with my rum.
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