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7rum build

 
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  #1  
Old 01-02-2013, 02:33 AM
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Join Date: Jun 2010
Posts: 113
7rum build

Hey guys,
Have a buddy that is looking to build a 7rum. I am helping him and was wondering what twist and if everyone is setting them up with factory freebore or shorter? Also wyatts box? Will mainly be shooting 180vld and hopefully the 195eol. Any recommendations appreciated.
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  #2  
Old 01-02-2013, 07:07 AM
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Join Date: Dec 2005
Location: Tucson Az
Posts: 1,232
Re: 7rum build

I am certain there are others that can offer more but I'll take a stab at it. You didn't mention action choice. Some actions will not allow a RUM case to pass the feed rails. Standard Rems won't. A friend wanted to build a LR 338 RUM and had to buy a 300 RUM for the action to save on machine work.

As for twist Berger says a min of 1 in 8.5 for the upcoming 195 EOL bullet. I can add that I was mislead on purchasing a 1 in 7 twist for a 7 Rem Mag to shoot 180 VLDs a few years ago. It was only offered in a 3 groove and proved to be a BAD combination. The combo of fast twist and 3 groove caused even the thicker target VLDs to come apart in flight once the barrel showed some wear. Can you believe it was just past 200 rounds? So IMO get a barrel with more than three grooves.

The wyatts box can be useful. I have added a few to my rifles. They make a special one for the RUMs with some cutouts on the sides which allow the larger dia cases to fit.

I have read that there needs to be some freebore with the 7 RUM. Perhaps others can comment on this.
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  #3  
Old 01-02-2013, 01:53 PM
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Join Date: Jun 2010
Posts: 113
Re: 7rum build

Thanks for the info. This will be a rebarrel so we have a rum action already.
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  #4  
Old 01-02-2013, 03:38 PM
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Join Date: Aug 2011
Location: Lynchburg, TN
Posts: 717
Re: 7rum build

From my experience with a factory Remington 700 Sendero in 7 RUM, save yourself some money, time and frustration and pick another caliber. The factory barrel had .400" of freebore and would not shoot with anything. The Berger 180 VLD would have had to have been 1/4" outside the case neck to touch the lands.

I finally sent it back to Remington and they said they would not rebarrel it in 7 RUM caliber, that I should pick another caliber. They said every barrel they had in that caliber was defective. They quit chambering in that caliber in the Sendero.

Pick another caliber.
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  #5  
Old 01-02-2013, 07:46 PM
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Join Date: Dec 2005
Location: Tucson Az
Posts: 1,232
Re: 7rum build

I owned three 7 RUMs and all would shoot with a jump to the rifling. One was a sendaro. One was put together with a PT&G reamer. Third one was a LSS which even stabilized the 180 VLD with a jump! The other rifles shot 140 nos bt, 160 accubond and a 168 sierra.
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  #6  
Old 01-02-2013, 09:01 PM
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Join Date: May 2012
Location: N.D.
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Re: 7rum build

My 7 rum liked the 140 sierra and 175 hornady and it jumped just fine. My freebore stopped at 4.1" and I loaded them to fit the mag, so about 3.650". The thing won't have great barrel life, so you will need to baby it and not heat it up. Shoot something else for range practice. Rem did produce some bad 7rum barrels; I got stuck with one that wouldn't shoot better than 2 moa no matter what I did. Fortunately the gun shop took it back and I later found another.
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  #7  
Old 01-04-2013, 05:42 PM
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Join Date: Feb 2006
Posts: 26
Re: 7rum build

My factory Sendero in 7 RUM likes 140 gr. Noslers and Corlokt ultras, and 162 gr. SST's, but does not like 168 gr. Bergers. I have not tried the 180 gr Bergers yet, but I am concerned about barrel errosion, so I have been playing with 190 gr. Matrix VLD's. They shoot well and I am getting 3050 fps from them. I am trying to use heavy bullets, and hence, less powder to prolong the barrel life. The 180 Bergers may also work in my rifle, but I don't have the time to try every combination, and the 190's from Matrix perform well on the range. I have not tried them on game, maybe this year.
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