Short barrel 270 or 30-06

[TxAg]

Does anyone shoot a 270 or 30-06 in a 20-21" barrel? Is it foolish?

I'd bet it's louder, and you'd lose 100 fps or so from a 24" barrel.

[twosixteens]

Never chronographed it but I have a Remington 742 carbine 30/06 not positive on the barrel length want to say 18 1/2 but might be twenty. Kills deer really dead and shoots really well with 150 grain core lokts.

[Raider4044]

I shoot a 22" .30-06

[TxAg]

Thanks.

[DWA]

I cut an old 270 down to 16" one time. Very loud tons of muzzle blast.

[TxAg]

Up

[DesertDug]

Had a 20" barrel on my .270 which i just changed out to 25". Shoots lights out now. You will loose velocity with shorter barrel which might be counter productive to the round.

The 25" barrel balances real nicely

How she sits now:

https://discussions.texasbowhunter.com/forums/showthread.php?t=705913

[Radar]

Might as well just get a 308, if your gonna cut the barrel down on a 30-06 plus you get a short action

[freerhunter16]

Might as well just get a 308, if your gonna cut the barrel down on a 30-06 plus you get a short action

My thoughts as well.

[TxAg]

Might as well just get a 308, if your gonna cut the barrel down on a 30-06 plus you get a short action

That's what I figured. I wouldn't be cutting anything, though. The gun/s come with a short barrel

[texasbbq]

You're only going to lose 10-15 fps per inch of shorter barrel with either cartridge.

[TxAg]

You're only going to lose 10-15 fps per inch of shorter barrel with either cartridge.

I read 32-37 fps on the 270 and 15 fps on the 30-06.

https://www.chuckhawks.com/rifle_barrel.htm

I have no hands on experience, though.

[mrc]

In a normal hunting situation of say 250 yard shooting, the deer wont have a clue how long the barrel is. A 20" 30 06 will always be faster than a 20" 308.

[texasbbq]

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GonHuntin
velocity loss in shorter barrels
By GonHuntin, July 26, 2005 in Rifles, Shotguns

GonHuntin
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Posted July 26, 2005
Things have been a bit slow, so I thought I'd post this as entertainment for some and enlightenment for others........



This info is from Charlie Sisk of Sisk Rifles........he is a VERY well respected rifle builder.



Quote
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 comparision.

So I did a few test myself.

All these were Shilen barrels. I used the same brass through

out 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

fron 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





Here is the info about the 338 Win and the 257 Roberts.

338 Win mag

Winchester brass

Federal GM215M primers

Reloder 19....73 grains

250 grain Partitions

27 inches.....2806 fps

26 inches.....2787 fps

25 inches.....2761 fps

24 inches.....2743 fps

23 inches.....2716 fps

22 inches.....2697 fps

21 inches.....2676 fps

20 inches.....2656 fps

150 fps from 27 inches to 21 inches



257 Roberts

Federal GM210M primers

Remington brass

H-4350....45 grains

120 grain Partitions

27 inches.....2860 fps

26 inches.....2834 fps

26 inches.....2815 fps

25 inches.....2815 fps

24 inches.....2798 fps

23 inches.....2775 fps

22 inches.....2760 fps

21 inches.....2739 fps

20 inches.....2717 fps

143 fps from 27 inches to 20 inches

I want to test this on the next 450 Marlin I build and on a

222 Remington. If I get the same results with those, in my

mind the test is over. I think this will be enough data to

support the findings. Are there any folks out there who have

a degree in this sort of thing ? Maybe explain how many data

points would be needed to be able to say this would work

with the majority of calibers ? Someone with experience in

statistical(spell check) quality control ?

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 FPS

.....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

Charlie

[silencer2011]

I Shoot 22" for my 243, 22-250, 7mm wsm, but i have nothing shorter than 22". I don't feel like the loss in velocity is a big deal. Your are talking about 270 and 30.06 anyway, not really speed demons. If it is the maneuverability that you are looking for, i say go for it.