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Tac

Let's talk barrel length

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Title says it all

 

Why do we shoot 26 inch barrel? Or longer or shorter? Velocity increases are minimal after all the powder is burned and is accuracy really any better.

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I don't own a barrel with a barrel longer than 22" and don't plan to...

 

With today's choice of bullets and turret/scope options, handiness is much more appealing to me as well as the lack of recoil (freaking hate brakes)...

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Oh I dont either, 10 years ago when I built my 300 Rum, friends were trying to get me to go with a 26 barrel, Im so glad I stuck with the 24 and did not do the 26. Nothing to gain IMO

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Some people don't care for the extra 20-60 fps faster and some people do with a 26" barrel. I love my breaks they shoot great! But my custom CM being built will be a 27" barrel because I want weight and low as possible recoil

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THE 308, 243, 7 08, 260 can have a 22 inch barrel, I would like a 24 inch on the 260 or 7 08 if it was to be a long range rifle. The 270, 3006,280 rem do very well with a 24 inch barrel (Perfect). Magnums 26 inch, slow powder, and heavy for caliber bullets.

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I own rifles with barrels from 16 to 27 inches. I choose the barrel length based on the cartridge and how I plan to use the rifle. I did some research years back when I was thinking about building a 20" barrel 7mm-08AI. One of the most useful items I found were tests done by a gunsmith named Charlie Sisk posted on another forum. I copied them and saved them as some of the best real world data I was able to locate on what happens to velocity as you shorten a barrel. What follows are his introduction and test results.

 

For a long time I have wondered about how barrel length affected velocity. I had always been told you need a certain length barrel for certain calibers. I have read when folks compared one gun to another with different lengths but I always thought that was not an apples to apples comparison. So I did a few tests myself.

All these were Shilen barrels. I used the same brass throughout the whole test. All weighed to with 1 grain. Bullets were tested on the Juenke machine. Powder charges were weighed to .1 grain. The same rest, chronograph, Redding press, primers all from the same lot, bullets for the same box, same lathe, same crowning tool, same cutoff tool, and each rifle done from start to finish on the same day. Ambient temperature was the same because I shoot from inside the shop. I held the rifle the same way on the rest every time. I shot ten rounds first to break in the barrel. Then cleaned with Sweets and fired one fouling shot. Then shot five rounds and took the average. I used a midrange load from the Nosler book, not too hot but certainly not a reduced load. Here is what I got.

 

22-250 Hodgdon 380 34 grains Federal GM210M Remington brass 55 grain Ballistic Tip
27 inches 3469 fps
26 3451
25 3425
24 3407
56 fps from highest to lowest

 

270 Winchester Hodgdon 4350 54 grains Federal GM210M Winchester brass 130 grain Sierra
27 inches 3115 fps
26 3093
25 3071
24 3054
23 3035
22 3027
21 3001
114 fps from highest to lowest

 

300 Winchester mag Federal GM215M Winchester brass 74 grains of Reloder 22 180 grain Partition
27 inches 3055 fps
26 3031
25 3024
24 3003
23 2984
22 2960
95 fps from highest to lowest

 

340 Weatherby Federal GM215M 250 grain Sierra
81 grains Reloder 22 Wby brass
27 inches 2837 fps
26 2817
25 2809
24 2791
23 2777
22 2755
21 2731
106 fps from highest to lowest

 

I think I will do a little more thinking before I recommend a barrel length in the future. What do you folks think ?
Charlie

 

A few weeks ago I done some testing with shortening barrels with various calibers. I just finished this test with a 300 Ultra.

These loads were EXTREMELY HOT !!!!!!!!!

I will not post the grains here because on the third loading the primer would fall out of the case . I never load this hot , only this time for the test. I used Remington brass, Federal GM215M primers, 220 grain round nose bullets. I used the same procedures as the last test.

 

length H-4895 H-870
.....27 2740 3107
.....26 2709 3088
.....25 2685 3062
.....24 2663 3046
.....23 2636 3018
.....22 2612 2997

H-4895 lost 128 fps
H-870 lost 110 fps

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The balance of the rifle is high on my list, a longer barrel just feels right. A little extra performance never hurt either. I wouldn't own a standard cartridge with a barrel less than 22 inch. I grew up with a couple of Remington 600 in the house, but If I had a choice it was the M 54 270 with 24 in barrel I took out hunting. It shot better than any rifle in the house new or old. Just personal preference.

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I,m currently shooting a 20 inch barrel,6.5 creedmoor that groups 1/2 moa at 850 yards and four of the 6 are 1/4 Moa 6 shots total 2-shooters one 10 year old and one 44 years old. I really question how short I could go before a substantial loss of accuracy on my next rifle. It seems there is a average 25 FPS loss per inch but if you hit the target accurately a few FPS loss to me would be ok.

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I’m thinking shorter than that say 16-20”

A good friend was told all the powder burns in 16-18" in a 30-06, so he cut off the barrel to 18" to save weight and then added a brake to cut recoil in his son's 30-06. It is a much louder and flashier SOB than his wife's 22" 30-06 with brake. The powder may have burned, but the gasses are still expanding in a longer barrel to provide fps.

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I got my daughter a youth rifle (7mm-08). it has an 18" barrel. I was a little concerned about the length but the thing is a tack driver (out of the box with factory ammo)

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I’m thinking shorter than that say 16-20”

A good friend was told all the powder burns in 16-18" in a 30-06, so he cut off the barrel to 18" to save weight and then added a brake to cut recoil in his son's 30-06. It is a much louder and flashier SOB than his wife's 22" 30-06 with brake. The powder may have burned, but the gasses are still expanding in a longer barrel to provide fps.

 

Many,many years the High Power Silhouette State Championship was held in Yuma and there was a guy from California who brought a 308 with an 18" barrel. You didn't want to be anywhere near him when it went off. Heck of a fireball though in the evening. I don't remember what his load was.

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