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260 barrel length

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  #15  
Unread 05-07-2009, 11:59 AM
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Re: 260 barrel length

Quote:
Originally Posted by jpterp View Post
...
I would like to keep the length of the barrel around 20" to keep weight down and make it manuverable, (similar to the Remington 700 SPS Tactical) ...
Thanks, John
Interesing topic... I'm contemplating a similar project and am intrigued by the 20" guns. The 20" R700 LTR with the fluted barrel is only 7.5# per the catalog. However, I'm not that intested in a 308 and would prefer a 7mm-08 or 260R for the superior ballistic coefficients.

I did some internal volume calculations to compare the different calibers and found that a 7mm would need something like a 23.6" barrel to have the same internal volume as a .308 20". A 6.5mm would need a 27.3".

Certainly I'm not an internal ballistics expert, and there are certainly other variables than specific volume, but I do believe the larger-bore cartridges for a given case capacity will have an easier time achieving their velocity potential with a shorter barrel than the same case necked down to a smaller bore.
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  #16  
Unread 02-16-2017, 01:23 AM
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Join Date: Feb 2017
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Re: 260 barrel length

I'm using a Remington xp100R with a 14 inch barrel (maybe 15, conflicting specs. Never bothered to measure it.) The only load I checked for velocities was a Sierra 120 grain pro hunter with 39 grains of varget for 2630 fps. It will shoot sub MOA. Short barrels are stiff. H4831 does make an impressive fireball. The biggest problem I have is stabilizing boat tails. I read it might be due to the higher muzzle pressures. Anyway, yes, faster powders do work better in shorter barrels. I have tried 4831, 4350, 414, and varget. I'm sticking with varget. The muzzle blast and flash are slightly reduced and the velocity loss to the shorter barrel is less. Hope this helps someone.
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  #17  
Unread 02-16-2017, 04:04 AM
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Re: 260 barrel length

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Originally Posted by Handgunner View Post
Hope this helps someone.
This post was dead 8 years ago, but hey ya never know....
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  #18  
Unread 02-16-2017, 07:49 PM
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Join Date: Jul 2008
Posts: 509
Re: 260 barrel length

Quote:
Originally Posted by Handgunner View Post
I'm using a Remington xp100R with a 14 inch barrel (maybe 15, conflicting specs. Never bothered to measure it.) The only load I checked for velocities was a Sierra 120 grain pro hunter with 39 grains of varget for 2630 fps. It will shoot sub MOA. Short barrels are stiff. H4831 does make an impressive fireball. The biggest problem I have is stabilizing boat tails. I read it might be due to the higher muzzle pressures. Anyway, yes, faster powders do work better in shorter barrels. I have tried 4831, 4350, 414, and varget. I'm sticking with varget. The muzzle blast and flash are slightly reduced and the velocity loss to the shorter barrel is less. Hope this helps someone.
This is very useful, thanks for posting. It may come as a shock to Cody Adams that barrel length is still a topic that gets discussed frequently. I'm looking at a Model Seven for taking a youngster after his first deer. I like the .260 but it seems like they need longer barrels to get the 130-140 grain bullets moving. The 7mm-08 is likely what I'll go with. The .284 diameter gives it about 16% more bore volume than a .264, which means a 20" 7mm-08 barrel has the same volume as a 23" barrel in .260. If I stick with the faster powders and medium-weight bullets I think the 20" barrel will do pretty well.
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  #19  
Unread 02-16-2017, 08:16 PM
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Join Date: Jan 2015
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Posts: 460
Re: 260 barrel length

Quote:
Originally Posted by el matador View Post
This is very useful, thanks for posting. It may come as a shock to Cody Adams that barrel length is still a topic that gets discussed frequently. I'm looking at a Model Seven for taking a youngster after his first deer. I like the .260 but it seems like they need longer barrels to get the 130-140 grain bullets moving. The 7mm-08 is likely what I'll go with. The .284 diameter gives it about 16% more bore volume than a .264, which means a 20" 7mm-08 barrel has the same volume as a 23" barrel in .260. If I stick with the faster powders and medium-weight bullets I think the 20" barrel will do pretty well.
Actually not a shock at all, I am aware that there are posts all the time about it. While it is kind for handguner to share his experience, it may not be of much use to the o.p. to post it in an 8 year old thread. Also, with handgun er being new to this forum, he may not even be aware that this thread is so old, and may be able to share his knowledge more effectively if perhaps he started a new thread, or commented in a new thread, as powders and other components have improved significantly since this thread was started. Nothing wrong with him posting here at all, as I said, it's generous to share knowledge, but perhaps it could be more effective shared in a newer thread.

Anyway, hope yall have a good evening.
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  #20  
Unread 02-21-2017, 04:21 PM
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Join Date: Feb 2017
Posts: 2
Re: 260 barrel length

I found all the information in this post to be interesting and useful. I am very grateful for everyone sharing their view. I felt that I could offer a different perspective. Seeing how I responded to an 8 year old post obviously an 8 year old post is still relevant.
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