Just because it's on the internet doesn't mean that it's a true statement. Longer barrels equal more velocity, period. Sure, there is a point of diminishing returns, but you won't lose velocity, especially at 27". A lot has to do with the load used, powder selected, and many other factors. 26" is a great length, and adding 1" of barrel length at that length will not decrease in speed.
And, look at the SD of the ammo shot. An SD of 29 at 27" is about an 87 to 116 fps extreme spread. So that tells me the ammo used is not very consistent at all. The SD's seem suspiciously high.
The link gets it posted and passed around to get clicks and extra hits to their website, which increases their traffic. So, the add is doing it's job, true or false.
Hi Chad,
The ammo was very consistent. It shoots 14.1 SD in my match rifle- 41.8 grains of H4350. That test gun was built specifically for the article, as we do for any of our tests. I would suggest you reread the entire post, you'll note a couple things; 1. it was 23F when the test was conducted and I was on the front edge of an ice storm, 2. the barrel was a fairly inexpensive one and brand new (and I am not bad mouthing GMB). My suspicion was the longer bearing surface of the 142 SMK and rough surface of the barrel yielded a lower than expected velocity, as the barrel shot in, this change became less apparent. I publish the data I actually gather, period. I don't make anything up. These are the comments I made in the post you obviously didn't fully read:
What do you think of the velocity decrease observed for the 142 SMK in barrel lengths greater than 24"?
I think this part of the data raises more questions than it answers. I would like to see this experiment repeated with a premium barrel and larger sample size. I’ve conducted this experiment with a 223 Remington, 243 Winchester, 308 Winchester, 7mm Remington Magnum, 300 Winchester Magnum and 7.62x39mm Russian. Only with the 7.62x39mm Russian, which has a much smaller case capacity, did I notice a decrease in velocity at the longer barrel lengths. The decrease may be related to the barrel length, however, it may also be related to the fact the barrel was new and may have needed more fouling prior to the test. The 142 SMK has a much longer bearing surface than the 120 A-MAX, which may help explain why this was observed in the 142 SMK but not the 120 A-MAX."And how they did the shooting and barrel cut back seems very cheesy. I'd love to do it and do it right with precision loaded ammo and cutting the barrel back properly with a good crown each time."Again- reread some of my posts regard methodology. What is less cheesy about crowning a barrel, we've shot sub MOA groups with Sawzall cut crowns, there is a lot of imperical data that suggests crowns don't effect accuracy as much as people think they do, go search accurateshooter/6mmbr
I'm going to suggest my reloading practices are most likely better than yours. I have access to a level of expertise and support most shooters/reloaders/shooting professionals can only dream of.
When you do your experiment and have the barrel crowned after each shot, how do you plan on controlling for air temperature? Which, I think we would agree matters. Well designed experiments have one variable, I controlled for air temp, barrel, ammunition, etc....
"The link gets it posted and passed around to get clicks and extra hits to their website, which increases their traffic. So, the add is doing it's job, true or false"
Yes- it does. Not a lot of imperial data on barrel length. It is popular because people want to know. I did so I started cutting up a bunch of rifles. It gives an indicator of observed values, rather than modeled values. They are popular and appreciated by thousands of shooters around the world.
Print "media" is dead and dying with good reason, they all sold out to manufacturers. There are only a few sites on the web that have great information and didn't sell out to manufactures. I believe I am the biggest of the guys "keeping it real". Read all of the posts on there and find you can find some objection too, I doubt you will. We publish all our groups and load development with guns as well as our recorded data.
Ironically, the first gun we hacked apart with a sawzall was a 300 Win Mag, we did it because a print "magazine" actually stated on a few occasions that the 190 Fed GM didn't increase in velocity after 20". So
Shoot me and email when you conduct your experiment. I'll help make it famous.