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20" 260 rem veloctity loss

 
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  #8  
Old 05-25-2013, 01:14 PM
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Join Date: Mar 2011
Location: Clark Co., IN
Posts: 67
Re: 20" 260 rem veloctity loss

Quote:
Originally Posted by benchracer View Post
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.
There are plenty of folks over on Sniper's Hide running 20" 260s reporting 2700fps +/- with 140s. There's one guy with a 18.5" 6.5 Creedmoor that gets 2640fps from Hornady 140gr factory ammo, and two others that have 16.5" 6.5 Creedmoors that get 2550fps with 139s and 2750fps with 123s.

Here's a 19" 260 that really set my mind:
My New 19" 260... Shorty

His 28" 260 ran 2850fps with 142s and 43.0gr H4350, and the same load in his 19" 260 went 2650fps. He bumped up to 43.5gr H4350 and hits 2700fps with the 142 or 140gr Hornady BTHP, and 2725fps with the 140 A-Max.
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  #9  
Old 05-25-2013, 10:47 PM
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Join Date: Jan 2006
Posts: 239
Re: 20" 260 rem veloctity loss

Shooting a 140 at 2,700 with a 20" is no problem. Easily done, and you don't need a 24" barrel either.
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  #10  
Old 05-25-2013, 10:50 PM
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Join Date: Dec 2009
Posts: 841
Re: 20" 260 rem veloctity loss

Quote:
Originally Posted by BoilerUP View Post
There are plenty of folks over on Sniper's Hide running 20" 260s reporting 2700fps +/- with 140s. There's one guy with a 18.5" 6.5 Creedmoor that gets 2640fps from Hornady 140gr factory ammo, and two others that have 16.5" 6.5 Creedmoors that get 2550fps with 139s and 2750fps with 123s.

Here's a 19" 260 that really set my mind:
My New 19" 260... Shorty

His 28" 260 ran 2850fps with 142s and 43.0gr H4350, and the same load in his 19" 260 went 2650fps. He bumped up to 43.5gr H4350 and hits 2700fps with the 142 or 140gr Hornady BTHP, and 2725fps with the 140 A-Max.
The Creedmore factory ammo numbers don't surprise me. A lot of what Hornady has been doing lately has been focused on using special powder blends to get max velocity from 20" barrels. We handloaders don't have access to the same technology that they do. Yet.

I am, however, VERY surprised by the .260 numbers. The fella in the last example you cited is 1.0 to 1.5 grains under max book loads, according to Hodgdon. What really surprised me is that he is loading to mag length and getting that kind of performance. It sounds to me like he has a chamber cut with a custom reamer, since he is getting a .010" jam with rounds loaded to mag length.

Interesting stuff!

As an aside, I have a scout rifle that I built a few years ago in 7x57 with a 19.5" barrel. It is a fun little rifle. Easy to carry and fast handling. I still prefer my long barreled rifles, though. They feel more balanced to me and sit steadier in my hands. That's just personal preference. It seems that I am often squarely in the minority when it comes to things like this.
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