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7mm??? Build

 
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  #22  
Old 02-07-2013, 09:23 AM
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Join Date: Feb 2008
Location: Three Rivers, MI
Posts: 716
Re: 7mm??? Build

Quote:
Originally Posted by brentc View Post
I obviously see things differently. I wouldn't even come close to saying most lrh rigs are overbore hot rods, many are but that's because people think that the "hotrod" is the only way to get out there. Let's take a look at your Edge, or even a Lapua. They are most definitely considered long range rifles capable of delivering massive amounts of energy at great distances but they are by no means a "hotrod" at 2850 fps with the heaviest bullets. You only need to drive the bullet fast enough to capitalize on the ballistic benefits of the bullet you intend to shoot. It's not about how fast we get to the target.

As far as the RUM goes, especially the 7mm RUM, Grit said it perfectly. Tuneability has a lot of merit when it comes to committing a match grade barrel to something you waste half the barrel life on trying to find consistency.

OP, please define your requirements. Why are you opposed to a belt and what are you trying to achieve? How much practical effectiveness do you actually think you will achieve by using 20 extra grains of powder to squeeze out an extra 50 fps over a 7mm/300? There are obviously differing opinions on what the maximum practicality is for a 7mm. If you are going for 1000 yards, which is about the maximum effective range for a 7mm of any type in a hunting situation, any of the 7mm Mags will work. If you need to extend further for hunting, you may as well make the jump to a big 338.
You have to remember I plan on shooting a 33" barrel so 50 fps difference I would say is off. Plan to shoot the new berger 195, or if wait is too long the 200 wildcat that I already have. Running the 195 at around 3200 with there est BC's it will run right with the big 338's out to 1500, with exception of energy, it will still have over 1500# at 1500 yards.

I'm still not sold on the RUM, as I have a 30" barrel as well that was thinking of doing a 7 REM Mag before I got this barrel. I was wanting to avoid the belted cases to just avoid some of the problems that can come with them.
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  #23  
Old 02-07-2013, 09:49 AM
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Join Date: Oct 2009
Location: Colorado Springs
Posts: 250
Re: 7mm??? Build

I gotta say i'm a big fan of the 7mm bore. It does well with long-range performance (trajectory essentially) and is easy to make hot-rod loadings for it without extreme increases in felt recoil.

However, with *all* calibers we run into the problem of powder burning out the barrel/throat when we're trying to get lazer-like trajectories. With radical increases in powder load (to achieve higher velocity), the throat can burn out so fast it can be challenging to develop the most accurate/most velocity before deterioration creates an unstable evaluation platform.

If extra barrel length helps that's great, but i believe the barrel length diminishing return is dependent on maximum powder charge - ie a 22-250 will achieve maximum powder-charge burn in a shorter barrel than say a 416 RUM.

Last edited by fmajor; 02-07-2013 at 09:50 AM. Reason: a goof.....
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  #24  
Old 02-07-2013, 08:50 PM
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Join Date: Nov 2006
Location: Dayton, Nevada
Posts: 1,793
Re: 7mm??? Build

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Originally Posted by fmajor View Post
Hey grinder i like your Edge! That's a nice looking rig there. What's the stock? I'd guess Manners, but not certain.... She's looker for sure and i'd guess a shooter too!
It's a Stockade Pdog/Tactical. A few years ago, when I got it, it was about the only option for left hand Savages.
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  #25  
Old 02-08-2013, 12:26 AM
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Join Date: Oct 2009
Location: Colorado Springs
Posts: 250
Re: 7mm??? Build

Thanks! I've seen their stocks one time before, but have never handled one. Looks like a really nice stock.
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  #26  
Old 02-08-2013, 01:15 AM
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Join Date: Jun 2010
Posts: 464
Re: 7mm??? Build

Quote:
Originally Posted by midwesthunter View Post
You have to remember I plan on shooting a 33" barrel so 50 fps difference I would say is off. Plan to shoot the new berger 195, or if wait is too long the 200 wildcat that I already have. Running the 195 at around 3200 with there est BC's it will run right with the big 338's out to 1500, with exception of energy, it will still have over 1500# at 1500 yards.

I'm still not sold on the RUM, as I have a 30" barrel as well that was thinking of doing a 7 REM Mag before I got this barrel. I was wanting to avoid the belted cases to just avoid some of the problems that can come with them.
Good luck waiting on the berger 195's. they said here they would be out last may. Still no one at berger can give a solid date. I lost $100 exchanging (selling then buying a new one) to just have it still not on the market.

If u want no belt and u have a mag bolt face without using a rum size case i will say again use the 7 lrm from gunwerks.

If you can use a .595 bolt face a 7/300 norma is a better choice than the rum and doesnt have the length problems of the rum.

If you are a tinkerer then make the 7mm version of elkahollics 30/375 s.i.

Other than that within your requirements im out of ideas.
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  #27  
Old 02-21-2013, 10:53 PM
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Join Date: Jun 2010
Location: blackfalds alberta
Posts: 128
Re: 7mm??? Build

With that length of barrel, if it were me, I would chamber in the 7lrm. I love the 7rem mag but the length is askin for more powder. I say the 7lrm because its not so overboar that it will burn a barrel fast but also let you set the barrel back a couple of times if possible to still be efficient in a ~26" barrel.

Not sure if a barrel can be set back more than once but at 33" it might be depending on contour I guess.
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