H&R Re-Chambers

[trotterlg]

I have been collecting chamber reamers and have a few on hand.  I am trying to figure out which ones will work for re-chambering H&R barrels from factory chambers to what I have.  I have a list below if anyone knows handi chamberings that any of these will clean up.  Larry

30 Carbine
32 H&R Mag
7X57 Mauser
30-06
270
256 Win Mag
357 Herrett
22 Hornet
300 Savage
35 Remington
17 Rem Fireball

[krod47nw]

Larry,
We know the 35 Rem will clean up a 357 mag.    I think that's the only one.  the 30-06 of course is a factory chambering or it would work in some.   I wish the 7x57 would clean up the 7mm-08, I'd love to have one, but it won't. 

Kevin

[d_hiker]

the .17 FB will work on the .17HMR & .17Mach2   

[BCall]

Has anybody actually rechambered a 17 barrel and mounted it to a centerfire frame? Just curious if it will actually work, I would love to have a 17 k-hornet, and that would be cheaper than stubbing one. Thanks, Billy

[GatCat]

Has anybody actually rechambered a 17 barrel and mounted it to a centerfire frame? Just curious if it will actually work, I would love to have a 17 k-hornet, and that would be cheaper than stubbing one. Thanks, Billy

Yep, I had Wayne York do this for me. I think several others here have, also.
Mark

[LaOtto222]

Let's see. The 7mm Mauser, 270, 30 carbine, 32 H&R, 256 Winchester Mag, will not clean up any of the Handi chambers. This is because there is not an equivalent bore or the chamber is too short to cleanup any one. The 300 Savage may clean up a 30-30, but you will have a long throat of too large a diameter; it will not clean up the neck for a 30-30 since the 30-30 is longer. That leaves the 30-06 which will clean up a 30-30 or maybe a 308. 357 Herrett or 35 Remington will clean up a 357 mag. 22 Hornet a 22 Mag. 17 fireball the 17 HM2 and 17 HMR. I do not think I missed any, but there may have been one I did.

JFYI - The rim fire barrels are not 4140 steel like the center fire barrels.

[kenbev]

I don't know if this will help any but I will list what I have. These were and are all NEF/H&R barrels.
A 17 Rem that was a 17 mach II.
A 218 Bee that was a 22 WMR.
A 220 Swift that was a 223 Rem.
A 225 Win. that was a 223 Rem.
A 6mm-AI that was a 243 Win.
A 30-40 Krag that was a 30-30 Win.
A 308X444 Marlin that was a 308 Win.

[skifastchad]

JFYI - The rim fire barrels are not 4140 steel like the center fire barrels.

I have read that several times here, and that the 17hmr barrels are 1137 steel.    Is that info from Marlin? 

The yield strength of 1137 steel is around 49900 psi.   Well below the SAAMI MAP of 55,000psi for the 17 rem fireball.

[quickdtoo]

I have read that several times here, and that the 17hmr barrels are 1137 steel.    Is that info from Marlin? 

Yes, that's from Marlin. Rimfire barrels and the 22Lr/410 Survivor are 1137, centerfire rifle barrels are 4140.

Tim

[mgunslinger]

I have heard about people having 30-30 lever guns re-cut to take a 38-55 could this not also be done to a Handi rifle barrel?? I do not mean to hi jack thread. Just wondering if this is an option for me..
 

[quickdtoo]

Sure, at $300 for a rebore, kind spendy considering a complete used 38-55 Target rifle with 28" barrel would cost about the same....but different strokes. 

Tim

[dodd3]

i think that the 303 british will clean up the 762x39 you can bye .310 303 bullets also you can swage .312 bullets down to .310.

bernie

[trotterlg]

I think the 7.62X39 Handi's had .308 bores now that you mention it, if so then the .300 Savage reamer I've got would clean one of those up.  Could even fix up the misfires they had.  Larry

[quickdtoo]

The 7.62x39 Handi had a .311" bore, 1 in 9¾" twist.

Tim

http://www.gboreloaded.com/forums/index.php/topic,83882.msg509366.html#msg509366

[djw]

JFYI - The rim fire barrels are not 4140 steel like the center fire barrels.

I have read that several times here, and that the 17hmr barrels are 1137 steel.    Is that info from Marlin? 
The yield strength of 1137 steel is around 49900 psi.   Well below the SAAMI MAP of 55,000psi for the 17 rem fireball.

Just took a quick look at Hodgdon's load data for 17 AH, 17 Bee, and 17 Rem/Fireball.  The pressures for the max loads given for the first two are ~45k, and for the latter ~50-51k; didn't see the listing for SAAMI for any of them.

What is the yield strength of 4140 steel as used in gun barrels?  I see table references anywhere from 60-200ksi, but don't know which treatment of 4140 is used in our application. Didn't find a 1137 table yet, but is the quoted value for the steel in our barrels?

Regarding the 1137 steel, it strikes me that reading the yield strength of the steel and comparing it directly to the chamber pressure is not a simple one-to-one comparison.  The pressure in the chamber does not translate directly to the steel, but is rather distributed about the perimeter of the chamber, to the full thickness of the chamber wall.  How much stress (in psi) the steel feels depends on the ratio of the chamber internal diameter to the chamber external diameter. Take the extreme example: .378ish chamber (17rem), in a chunk of steel a foot in diameter; obviously it will hold.  Make the chamber wall .200" thick, though, and you might want to get your slide rule out.

Just my .02.  Please correct me if this is just wrong.

Don

[Smokin Joe]

Here's Barlow's formula, if you want to play around with it:



    P = 2 s t / [(do - 2 t) SF] (1)

    where

    P = max. working pressure (psig)

    s = material strength (psi)

    t = wall thickness (in)

    do = outside diameter (in)

    SF = safety factor (in general 1.5 to 10)


Also, this does not take into account stresses induced by rifling, chambering, roll-stamping etc.

[melchior]

Not sure I'm right here, but I'm thinking the issue about yield strength probably won't express itself as a burst chamber/bore so much as it will in the area of swift throat erosion.

Don

[mitchell]

I would love to have a 17 k-hornet,

i'll have mine back from the smith in a few weeks

[skifastchad]

Also, this does not take into account stresses induced by rifling, chambering, roll-stamping etc.

Also take into account the welding to the underlug on a rimfire barrel.  On the 3 I have, the weld thickness and quality (quality based on looks alone) is far less than that of SB2 barrels. 

Maybe it can be done.  I have found some more heat treating info that lists the 1137 steel at a yield strength of up to 90ksi.

I also have to assume there is a reason that 1137 is only used in rimfire and black powder guns.

[dodd3]

The 7.62x39 Handi had a .311" bore, 1 in 9¾" twist.

Tim

http://www.gboreloaded.com/forums/index.php/topic,83882.msg509366.html#msg509366

Tim a friend on the east side of oz had one which slugged out at .312 at the breach and .310 at the muzzle he had that reamed to .303 British  and says its a tack driver,he did it because he had 1000 new ,303 unprimed brass said he is glad he did it,he said in 762x39 it was not that accurate.
Bernie

[quickdtoo]

Sounds like a .311" bore to me. 

Tim

[ncpreacherboy1]

I don't know if this will help any but I will list what I have. These were and are all NEF/H&R barrels.
A 17 Rem that was a 17 mach II.
A 218 Bee that was a 22 WMR.
A 220 Swift that was a 223 Rem.
A 225 Win. that was a 223 Rem.
A 6mm-AI that was a 243 Win.
A 30-40 Krag that was a 30-30 Win.
A 308X444 Marlin that was a 308 Win.

got any specs on this one? looks intriguing.

[dpe.ahoy]

7x57 AI on a 7mm-08.  DP

[kenbev]

ncpreacherboy1
No specs, I bought them already rechambered. I just shoot them....

[ncpreacherboy1]

is it simply a 444 marlin necked down to accept 30  cal bullets?

[OHHJIMMY]

I would be interested in the .357 to 35 remington conversion. Has anyone done this, and how did it work out?
I'm wondering if the twist is correct, etc. Starting this year in Mississippi, we can use 35 cal during primitive weapon season. The 35 remington would be a very good deer cartridge (like I need another deer rifle).

[eod20]

i second that    i want a 35 rem   and if a rechamber is the only way to get it?     does anyone know if 35 rem was ever offered in as a factory barrel?

[quickdtoo]

It works fine, I have one, so does MSP ret, the only issue is if done on an ejector barrel it needs to be converted for rimless, see the FAQs and Help for that. Mine shoots 200gr and 240gr cast bullets into 1" at 100yds.

It was supposed to be offered from the factory late this year or next for the first time, but again, lack of distributor orders put the cabosh on it just as it did for the Handi-mags, so it's no longer even scheduled for 2009 at this time. 

Tim

[eod20]

thanks quick   so i need to find an older 357 barrel to do the conversion the easist    do you know of a possiable canidate? 

[quickdtoo]

An extractor barrel would be easier, nothing needs to be done except the rechamber and trim the extractor post just a little..... I think.

Tim