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7mm LRM

 
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  #8  
Old 09-30-2013, 10:36 PM
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Re: 7mm LRM

I was referring to the 7-300 Win Mag not a 7-300wsm. 3050fps is pretty easy for a 7-300wm in a 26" barrel. The loads are even pretty much the same between the two. Why limit yourself to their brass when you can do a 7-300wm and use readily available brass from many different sources including Lapua (if you can find it) and RWS (which is as tough as it gets). You can also use a 300wm bushing die to size your cases to make life easier. My 7-300wm has a 27" Schneider barrel and get's 3160fps with 162 Amax's using 73grs of H-1000 in RWS cases which are slower and have less capacity than other brands but last forever.
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  #9  
Old 10-01-2013, 06:24 AM
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Re: 7mm LRM

I built two 7mm/375s recently, not the 7mm LRM. Reason is brass availability. I have always seen 375 Ruger brass on the shelves when there is nothing else. I had the dies necessary to make this wildcat. Only thing I needed was the reamer which I buy regardless of build. Life is too short to use reamer that isn't spec'd out.

I would agree that the 7mm-300 win mag would be easy to make IF the brass was available.
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  #10  
Old 10-01-2013, 06:34 AM
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Re: 7mm LRM

Not sure on the advantage over a 7STW?
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  #11  
Old 10-01-2013, 07:04 AM
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Re: 7mm LRM

Not really any advantage over the 7STW, other than doing the same thing in a shorter coal.
The 7 Rogue is I believe the best case capacity for the 180's in a 7 mm package.
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  #12  
Old 10-01-2013, 07:18 AM
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Re: 7mm LRM

Just read about the 7mm Rogue.

7mm Rogue » R Bros Rifles

It would appear to be pretty much the same as the 7mm/300 win with "some measurement relationships with todays “accuracy” cartridges" quote copied from article.

IMO the 7mm Mashburn/ 7mm-300 win mag 7 LRM and 7mm/375 Ruger are pretty much the same. Variations will be in the throating based on who requests the reamer specifications. Pick one and run with it with indistinguishable performance.
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  #13  
Old 10-01-2013, 08:02 AM
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Re: 7mm LRM

300wm brass is available. I just bought 150 rounds of Nosler brass last week. Shooters Pro Shop had about 30 boxes of seconds. The good thing about it is the caliber is popular enough you'll see it for sale typically within a week if you watch for it.

You are right in that 375 Ruger is on the shelves a lot. The down side is having to buy several sets of dies to neck it from 375 to 7mm. One pass through my 7-300wm die turns 300wm into 7-300wm.

If your limited to standard magazine lengths the 7-300wm doesn't give up much to a 7STW. Seated long a STW is 100+fps faster.
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  #14  
Old 10-01-2013, 08:34 AM
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Re: 7mm LRM

anyone know the case capacity of the7-300?
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