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20" 260 rem veloctity loss

 
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  #1  
Old 05-20-2013, 12:32 PM
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Location: Maine
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20" 260 rem veloctity loss

Anyone have a short 260 that can tell me about what velocity you are getting with 123 amax, 140 amax, or others in that weight range? Trying to run some ballistic comparisons. Might look at make my heavy barreled 308 into a switch barrel with a lw 260 barrel as its mate.

Thanks,

Dustin
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Old 05-20-2013, 01:24 PM
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Re: 20" 260 rem veloctity loss

I really think you are going the wrong direction here. As a general rule, the larger bores tend to lose less velocity in shorter barrels than smaller bores of the same case capacity. As the bore becomes smaller, slower burning powders are required, which in turn necessitates longer barrels for optimum performance.

If you want a short barrel, go with the .308. If you want a .260, go with a 24-26" barrel.
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Old 05-20-2013, 01:54 PM
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Re: 20" 260 rem veloctity loss

That is what I was thinking, just confirming. It is a barrel that is for sale in the classifieds here and it would cut the weight of my rifle in half. I wasn't sure what the real world loss would be. Couldn't find too much info on it, probably because it isn't a popular idea.

Thanks
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Old 05-20-2013, 05:04 PM
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Re: 20" 260 rem veloctity loss

"If you want a short barrel, go with the .308. If you want a .260, go with a 24-26" barrel."

+1

I have a 243 with a 16" barrel and it gets about 400 fps slower than a 24" barrel shooting the same factory ammo. That sucks.

I shoot a 260 with a 26" barrel, shooting 140 Amax's it gets 2800fps. I don't know what would happen if I cut the barrel by 6" but I doubt it would be the same rifle.
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Old 05-20-2013, 06:23 PM
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Re: 20" 260 rem veloctity loss

That scraps that idea. My short 308 is enough of a dog, no point in shooting lighter bullets slower. Guess I'll just have to go with 300 wsm I always wanted: 26" with a lighter contour, muzzle brake, and flutes. Thanks for the help.
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Old 05-24-2013, 07:34 PM
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Re: 20" 260 rem veloctity loss

Quote:
Originally Posted by jpd676
I shoot a 260 with a 26" barrel, shooting 140 Amax's it gets 2800fps. I don't know what would happen if I cut the barrel by 6" but I doubt it would be the same rifle.
20" 260s don't have much trouble hitting 2700fps with 140s or 2900fps with 123s with a moderate load of H4350...at worst, you're looking at 2650fps which still spanks a 308 at intermediate and long range.

I've got a 260 with a 26" barrel...it will be getting chopped to 20, maybe 21". Don't need the velocity as all my shooting is <650yd, it'll still have plenty of arse for 1000yd should I push it that far, and it'll be MUCH handier for stand hunting.
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Old 05-25-2013, 07:44 AM
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Re: 20" 260 rem veloctity loss

Quote:
Originally Posted by BoilerUP View Post
20" 260s don't have much trouble hitting 2700fps with 140s or 2900fps with 123s with a moderate load of H4350...at worst, you're looking at 2650fps which still spanks a 308 at intermediate and long range.

I've got a 260 with a 26" barrel...it will be getting chopped to 20, maybe 21". Don't need the velocity as all my shooting is <650yd, it'll still have plenty of arse for 1000yd should I push it that far, and it'll be MUCH handier for stand hunting.
2700fps in a 20" barrel? I think you are pretty optomistic. Even 2650fps would be a lot closer to the kind of velocity loss you are going to see out of a .308, which is going to be a lot less sensitive to barrel length than a .260.

It's possible that I am wrong about this, but I would dearly love to see a chrono comparison of the same loads from a 24" or 26" barrel and a 20" barrel. If you do decide to have your barrel cut down, you could provide some useful before and after data.
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