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Which 7mm for a long range rifle?

 
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  #15  
Old 11-30-2011, 07:05 AM
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Re: Which 7mm for a long range rifle?

The STW will have a shorter barrel life, not due to throat erosion, that can be cured with a slight setback, the problem is the amount of powder being burned causing the rifle to slightly pit and crack 4-8" after the throat and that makes accuracy fall off quicker, the reason I mentioned the weatherby is it has all the good things the STW has and none of the 7mm rem mag downfalls plus it has a superior shoulder design than the STW or Rem Mag. With factory loadings Nosler loads the 160 accubond to 3225, Weatherby loads the same bullet to 3250 for about the same price. Then when you do start reloading Weatherby/Norma brass is much better than the Nosler or Remington available for the STW. If I were choosing between the STW and Rem Mag I would take the Rem Mag just because of available components.
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  #16  
Old 11-30-2011, 09:43 AM
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Re: Which 7mm for a long range rifle?

Quote:
Originally Posted by pyroducksx3 View Post
Well see there I go learning something again. But how about barrel life then it should be no argument that barrel life is longer with the 7 rm
Throat wear is the biggest factor in barrel life. In most situations the larger the case capacity for a given bore size the shorter the barrel life. The 7 STW and 6mm Rem are rare exceptions.
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  #17  
Old 11-30-2011, 09:52 AM
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Re: Which 7mm for a long range rifle?

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Originally Posted by backwoods83 View Post
The STW will have a shorter barrel life, not due to throat erosion, that can be cured with a slight setback, the problem is the amount of powder being burned causing the rifle to slightly pit and crack 4-8" after the throat and that makes accuracy fall off quicker, the reason I mentioned the weatherby is it has all the good things the STW has and none of the 7mm rem mag downfalls plus it has a superior shoulder design than the STW or Rem Mag. With factory loadings Nosler loads the 160 accubond to 3225, Weatherby loads the same bullet to 3250 for about the same price. Then when you do start reloading Weatherby/Norma brass is much better than the Nosler or Remington available for the STW. If I were choosing between the STW and Rem Mag I would take the Rem Mag just because of available components.
Setting back and rechambering can sometimes be done once, but it isn't the beat idea for top accuracy. Many BR shooters refuse to rechamber a barrel once the throat goes for this very reason.

The biggest issue with the 7mm Wby is the .375" of freebore. That much freebore is not what one does when looking for the ultimate in accuracy. Yes, we all have had a freebored rifle or two that shot well and in most hunting applications freebore isn't an issue. However, an 800 yd rifle needs every advantage and freebore isn't optimum for accuracy.
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  #18  
Old 11-30-2011, 11:43 AM
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Re: Which 7mm for a long range rifle?

My weatherbys are short throat match chambers in most cases, however I have a 257wby with .355" freebore that will shoot 1/2 moa any day. With common tangent ogive hunting bullets (not berger vlds even though they sometimes work with a pile of freebore) you will not notice any difference in accuracy. I shoot benchrest and if I get a one hole wonder and have run out of room to chase the throat in, the barrel is likely to end up 3-4" shorter. I have yet to see any chambers, even custom ones with less than .045" freebore, most saami chambers have atleast .100" freebore, I have a factory ruger m77 all weather ultra 300wm that is factory and has .215" freebore, so unless you have side by side proof with two identical rifles with factory length identical rounds, and the only difference is one has .100" freebore and the other has .350" and a seasoned shooter operates both and I can witness the difference in accuracy, I call BS on freebore hindering accuracy unless your to good to shoot anything but bergers!
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  #19  
Old 11-30-2011, 12:25 PM
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Re: Which 7mm for a long range rifle?

Quote:
Originally Posted by backwoods83 View Post
The STW will have a shorter barrel life, not due to throat erosion, that can be cured with a slight setback, the problem is the amount of powder being burned causing the rifle to slightly pit and crack 4-8" after the throat and that makes accuracy fall off quicker, the reason I mentioned the weatherby is it has all the good things the STW has and none of the 7mm rem mag downfalls plus it has a superior shoulder design than the STW or Rem Mag. With factory loadings Nosler loads the 160 accubond to 3225, Weatherby loads the same bullet to 3250 for about the same price. Then when you do start reloading Weatherby/Norma brass is much better than the Nosler or Remington available for the STW. If I were choosing between the STW and Rem Mag I would take the Rem Mag just because of available components.
How you shoot, how much you shoot, and particularly how fast you shoot at any give time has a far greater impact on throat erosion than anything else.

The only component difference between the STW, WBY, and 7Rem is the bass and there has never been any shortage of brass available for 20 plus years.

Also a slower burning powder like H-1000 makes a bid difference in how much heat gets applied to the first few inches of the bore.

I've been shooting the same barrel in my 7mm STW since 1990 and I'm just now to the point of considering rebarreling and not because it doesn't shoot well any more, but because I'm thinking of turning it into a dedicated long range only rig with a longer barrel.

Barrel life simply isn't a major issue for most hunters because they'll never shoot one enough in a lifetime to burn one out.
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  #20  
Old 11-30-2011, 12:36 PM
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Re: Which 7mm for a long range rifle?

20 years ago I built a 7mm/300 WBY wildcat with off the shelf RCBS reloading dies, a reamer with fairly short throat from JGS precision tool and just ran 300wby brass thru the resize die to neck it down ,,, then trim and walla, a real nice and fast 7mag ,,,,,,

IMR-7828 was the preferred powder, with fed 215 primer, 140gr B/tip was very accurate, 11-twist barrel ,,,
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  #21  
Old 11-30-2011, 04:20 PM
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Re: Which 7mm for a long range rifle?

WildRose

Quote:
I've been shooting the same barrel in my 7mm STW since 1990 and I'm just now to the point of considering rebarreling
How many rounds and can you quantify the decrease in accuracy.
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