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Sporter weight barrel as a LR rifle ?

 
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  #8  
Old 04-07-2010, 07:35 AM
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Re: Sporter weight barrel as a LR rifle ?

Quote:
Originally Posted by cmillett79 View Post
You just explained one of my greatest concerns Fitch .. This is one thing that I am thinking about..Honestly Id like to keep the barrel length 26" if possible in the 7mm mag..If I have to go 24" or less I would go with a NONmag standard caliber..I once had a 280 and a 7mm mag .. The 280 had a 22" barrel and the mag 24" .. The difference in vel. was min. when pushing "accurate" loads in the same bullet weight..There was no real world advantage with the mag .. This was after a couple months worth of trial loads .. I believe the 280 in 150gr sierras (neck sized) was only 80-120 fps slower than the 7mm mag with the same bullet but loaded for accuracy.. I think the mag was pushing it at 2950+/- and the 280 was a hair over 2850fps.. This is one reason if I saty with the 7mm mag to keep the barrel lengtrh at least 26" ... I wonder if going with a one contour heavier barrel than factory and adding flutes would stiffen it or maybe having it chryo'ed ?
Chryogenic treatment won't do anything for stiffness - that's controlled by section moment and Young's modulus which aren't changed by chryogenic treatment. The Chryo treatment should increase stability, i.e. the barrel will shift less due to temperature change, but that isn't usually an issue in a 1 or two shot hunting rifle.

Based on what you said, wanting to keep the MV up, if it were me I'd go with a #5 taper barrel. It's a nice compromise between sporter and benchrest.

I have a 7mm Rem Mag Savage BVSS coming (should be here a week from Friday) that has something approaching a #7 taper barrel on it. That's for a rifle intended for hunting from stands - it will weigh almost 12 lbs to 12.5 lbs with scope. It's heavier than you have in mind.

Fitch
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  #9  
Old 04-07-2010, 11:34 AM
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Re: Sporter weight barrel as a LR rifle ?

If built properly there is very little difference in hunting accuracy requirements. My 4.5 Krieger contours shoot bug holes but are built the same way with the same components as one of my match rifles. Example is my 6.5x284 the 16.8lb at 300 yards will shoot .15 MOA and so does the 8lb with scope sporter using the same ammo. Now if I were to rattle 15 rounds off in 3 or 4 minutes the Lt Wt would be at a disadvantage but there are many things besides tube wt to consider. Have fired 5 as fast as could load from the right side which is tough when feeding (competition actions are RBLP) individually about 45 seconds and shot perfect.

Bottom line no difference for huntingand I have several---the builder and the components are the key.
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Last edited by Boss Hoss; 04-07-2010 at 12:24 PM.
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  #10  
Old 04-07-2010, 11:36 AM
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Re: Sporter weight barrel as a LR rifle ?

Quote:
Originally Posted by cmillett79 View Post
You just explained one of my greatest concerns Fitch .. This is one thing that I am thinking about..Honestly Id like to keep the barrel length 26" if possible in the 7mm mag..If I have to go 24" or less I would go with a NONmag standard caliber..I once had a 280 and a 7mm mag .. The 280 had a 22" barrel and the mag 24" .. The difference in vel. was min. when pushing "accurate" loads in the same bullet weight..There was no real world advantage with the mag .. This was after a couple months worth of trial loads .. I believe the 280 in 150gr sierras (neck sized) was only 80-120 fps slower than the 7mm mag with the same bullet but loaded for accuracy.. I think the mag was pushing it at 2950+/- and the 280 was a hair over 2850fps.. This is one reason if I saty with the 7mm mag to keep the barrel lengtrh at least 26" ... I wonder if going with a one contour heavier barrel than factory and adding flutes would stiffen it or maybe having it chryo'ed ?
I've chronographed extensive load development for my 24 3/8" barreled 7mm Rem Mag and 28" barreled 280 Improved with the same Berger 168 VLD bullets. My MV with maximum, accurate loads for the 7mm Rem Mag is 3050 fps. MV with max loads and good accuracy in the 280 Improved are 2920 to 2950 fps. So the 7mm RM gives me 100 - 130 fps higher MVs in the substantially (3 5/8") shorter barrel.

The heavier the bullet, the greater the increase in the MV of the 7mm RM over the 280.

Last edited by phorwath; 04-07-2010 at 11:46 AM.
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  #11  
Old 04-07-2010, 12:52 PM
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Re: Sporter weight barrel as a LR rifle ?

I have quite a few 26" #3 barrels that shoot very well for hunting accuracy at the range you indicated. I would have no problem with a 7mm rem mag in a 26" barrel at that range.
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  #12  
Old 04-07-2010, 07:29 PM
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Re: Sporter weight barrel as a LR rifle ?

I agree with the other posters, you should have no problem getting out to 800 yds or so. I have been shooting a factory 24" 300 WM and it has been very accurate out to 800, and have even taken it to just over 1,000. The barrel finally went south on it and I had it rebarreled with a Broughton 4.1 contour finished at 25". With the factory barrel and McMillan Edge stock, the gun alone wieghed 6.75 lbs, with the new barrel it is just under 7-1/4 lbs. I have other heavier barreled rifles which do better at longer distances, but for a light weight carry gun, I appreciate the 7-1/4 lb rifle.

I forgot if you said you were looking at barrel ideas as well, If you are, take a look at that 4.1 contour that Broughton does.
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  #13  
Old 04-09-2010, 09:16 AM
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Re: Sporter weight barrel as a LR rifle ?

Quote:
Originally Posted by phorwath View Post
I've chronographed extensive load development for my 24 3/8" barreled 7mm Rem Mag and 28" barreled 280 Improved with the same Berger 168 VLD bullets. My MV with maximum, accurate loads for the 7mm Rem Mag is 3050 fps. MV with max loads and good accuracy in the 280 Improved are 2920 to 2950 fps. So the 7mm RM gives me 100 - 130 fps higher MVs in the substantially (3 5/8") shorter barrel.

The heavier the bullet, the greater the increase in the MV of the 7mm RM over the 280.

Yes sir I agree with you on the fact that with heavier bullets the mag shines.. But at the time in that case that a described it wasnt practical in my eyes having to do with those 2 rifles I was speaking of .
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  #14  
Old 04-09-2010, 09:19 AM
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Re: Sporter weight barrel as a LR rifle ?

Thanks for all the posts my friends.. It has helped alot.. Im thinking I may go with what I had in mind since the rifle intended purpose will not be for a ton of bench shooting and not a comp rilfe either .. It will be used mainly for hunting in my pastures out to 600-800yds.. Going on what Ive read so far , I shouldnt have a problemwith a properly built sproter weight rifle reaching out to thise ranges for a shot or 2 accurately.
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