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5R mil-spec

 
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  #1  
Old 12-02-2012, 01:06 AM
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Join Date: Jun 2012
Location: Pagosa Srpings,CO
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5R mil-spec

A question for those more knowledgeable about ballistics than I. Does the 1 in 10 twist in these barrels stabilizes a 180 gr bullet, or do they prefer a heavier weight bullet? I am thinking of one, and have lots of 180's for 300 win mag.
Thanks for any input.




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  #2  
Old 12-02-2012, 08:34 AM
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Re: 5R mil-spec

This might help:
JBM - Calculations - Stability

I have the 5R in .308 Win, Betsy is her name.
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  #3  
Old 12-02-2012, 12:24 PM
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Re: 5R mil-spec

That is an awesome link. Very helpful info. That's why I love this forum, somebody always has an answer. Thanks again TomT



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  #4  
Old 12-04-2012, 07:44 AM
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Re: 5R mil-spec

308 or 300wm? and where are you in CO?
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  #5  
Old 12-04-2012, 08:35 PM
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Re: 5R mil-spec

The 5R 300 win mag has a 1-10 twist, the 5R 308 win has a 1-11.25 twist.
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Remington 700 5R .308 Win
Leupold Mark 4 6.5-20x50 LR/T Illum. TMR Reticle

Browming X-Bolt .30-06
Nikon Monarch SF 4-16

Weatherby Mark V 30-378
Nightforce 5.5-22 x 56
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  #6  
Old 12-04-2012, 09:04 PM
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Join Date: Jun 2012
Location: Pagosa Srpings,CO
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Re: 5R mil-spec

I am in Pagosa Springs waiting for it to turn into winter, but I am looking for a new 300 win mag in a 5R. I already have a 308 that shoots 1/4 moa if I can get my head in the same place every time.Was wondering if a 180 gr would stabilize in a faster twist, and apparently it will, so I am on the hunt for a 5R mil spec.


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  #7  
Old 12-05-2012, 08:11 AM
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Re: 5R mil-spec

I'll be moving to CO Springs here in January, and have a 5r in 300wm. I'm assuming your 308 is a 5r? and you're looking for a 5r in 300wm?

I believe the twist in your 308 is kinda non-standard (11 1/4 if I remember correctly) so it can handle the 168 and 180 slugs, but don't have the specs in front of me. With the 300/5r you'll have a 1 in 10 and no problems stabilizing up to and past 210, and I believe even 230.

I'm currently trying to work up a load in my 300wm 5r, didn't have much success with a newer powder, Magpro (but fantastic velicities) so I'm going with one of the standbys for caliber: H4831sc. That should get me going for next season with all summer to practice.

From what I've seen so far, I can't get mine to shoot decidedly better than a moa, but it consistently shoots right at with the cheapest factory ammo out there. Sometimes a tad more, sometimes a tad less. I'm hoping a good load workup can bring it consistently under, so I can push my max out a little further.

I just wish it was as much of a tack driver as the 308 5r's.

Good luck and keep us posted!


Chris
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