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Author Topic: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?  (Read 1083 times)

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Offline jkpq45

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.30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« on: May 22, 2012, 10:30:12 AM »
Anybody ever done this rechamber?  Anyone ever thought about doing this rechamber?

Just curious....
jkpq45
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Offline Jason F

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #1 on: May 22, 2012, 10:41:12 AM »
Handi rifles are not suited for magnum chamberings
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Offline quickdtoo

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #2 on: May 22, 2012, 10:45:09 AM »
What Jason said, the 378 Wby case head is .578", way too big at the pressure they run at, I tried a 300WSM(rechambered 308W) which has a smaller .555" case head and reduced pressures, couldn't equal 30-06 150gr velocities without too much action flex for any decent accuracy.

Tim
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Offline jkpq45

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #3 on: May 22, 2012, 10:45:11 AM »
What are the SB-2s rated to?  45,000 PSI SAAMI cartridges?
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Offline quickdtoo

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #4 on: May 22, 2012, 10:50:10 AM »
The Handi is factory chambered in 270 Win which has a SAAMI MAP of 65kpsi and a .470" case head, go to a bigger case head and the pressure needs to go down, the 500S&W is another factory chambering which has top loads of ~53kpsi and a .530"ish case head, that should give you an idea of what would work.

Tim
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Offline quickdtoo

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #5 on: May 22, 2012, 12:57:17 PM »
Here's a quote from a previous discussion that should help determine what may work and what likely won't.  ;)

Tim

Quote
Breech thrust on a break barrel (same as bolt thrust) can be calculated using a simple formula, use the external case head diameter for a ball park comparison, actual breech thrust is dependent on the internal case head area and the pressure. I use the hydraulic cylinder calculator since it uses the same formula, just add the cylinder diameter(case head diameter) and pressure in PSI, the other fields don't apply and aren't needed.

http://www.riflebarrels.com/articles/custom_actions/bolt_lug_strength.htm

http://www.baumhydraulics.com/calculators/cyl_calc.htm
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Offline Sourdough

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #6 on: May 23, 2012, 08:40:25 AM »
If a Handi could be chambered for Weatherby Cartridges, I would have done it years ago.  I shoot the .337/378 Weatherby quite a bit.  One step above the .338 Laupua Magnum cartridge the Army Snipers use.  Beautiful cartridge, reaches out and touches things, with enough authority to do the job at long ranges.  At $5.00 a round factory, $7.00 a round my handloads, doubt many people would want one. 
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Offline northkid

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #7 on: May 23, 2012, 10:13:11 AM »
Just buy a Remington 300 Ultra Mag and save money and be safe all the way around. Do some research the 300 super mags burn out barrels pretty quickly, if you shoot a lot.
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Offline jkpq45

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #8 on: May 23, 2012, 10:44:11 AM »
Sure--just was considering the fastest .30 caliber available.

Is 30 Gibbs the most powerful round the .308Win bull barrel can be rechambered for?
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Offline Jason F

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #9 on: May 23, 2012, 11:28:12 AM »
Not much faster than a 30-06
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handi rifles- 22 mag      22 hornet    223      7mm-08      308 chip shot     30-30 x2     30-06 shorty      358 cheez whiz     357 max     35 remington     375-08    410 rifled slug     454 casull     460 s&w     45 smokeless muzzleloader x2     45-70    50 huntsman    50-70 government shikari     20 ga.ush     12 ga.ush    12 ga.3 1/2     10 ga.imp.cyl. slug gun

Offline jkpq45

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #10 on: May 23, 2012, 11:44:46 AM »
Lame!  Thinking of just sticking with the .308 bull, which I'd really prefer not to do as the .308Win is pretty ho-hum.  Cheap to shoot, though!
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Offline Sourdough

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #11 on: May 23, 2012, 12:39:07 PM »
My partner shoots a 30/378.  He likes the velocity he is getting.  Pretty fast, but I like the energy i am getting. 
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What Is A Veteran?
A 'Veteran' -- whether active duty, discharged, retired, or reserve -- is someone who, at one point in his life, wrote a blank check made payable to 'The United States of America,' for an amount of 'up to, and including his life.' That is honor, and there are way too many people in this country today who no longer understand that fact.

Offline gendoc

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #12 on: May 23, 2012, 12:53:11 PM »
Quote from: Sourdough on May 23, 2012, 08:40:25 AM
If a Handi could be chambered for Weatherby Cartridges, I would have done it years ago.  I shoot the .337/378 Weatherby quite a bit.  One step above the .338 Laupua Magnum cartridge the Army Snipers use.  Beautiful cartridge, reaches out and touches things, with enough authority to do the job at long ranges.  At $5.00 a round factory, $7.00 a round my handloads, doubt many people would want one.
Rog,
j2 has read this post from his coop area..... i talked with him today and he wanted me to tell you,
"i feel your connection with the LM as a 900+ meter devastation, it is a jewel in the mist depot 8)
i have hand taylored many"
 
 
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sea-ya.....
in tha meen time, i'm wait'n for tha  7th trumpet ta sound !!!

gotta big green tractor ana diesel truck, my idea of heaven's chasin whitetail bucks and asa country boy, you know i can survive............

hey boy, hit this mason jar one time...
burn ya lil'bit did'nt it. ya ever been snipe hunt'n ?  come on...

I prefer dangerous freedom over peaceful slavery.

Offline Sourdough

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #13 on: May 24, 2012, 11:55:49 AM »
gendoc/j2:  When I was looking to get into long range shooting, I looked at the .338 Laupua Mag.  I found as AR-30, and was going to purchase it.  I procrastinated that evening, and when I went back the following day it was gone.  I looked else where and found a Weatherby Mark IV Accumark in .338/378.  A marine sniper friend who was home on leave, discussed scopes with me.  He advised me not to go higher than 15 power.  When you snuggle into the stock your heart beat will move your sites with every beat.  He is right, scope moves right then back left half as much then back on target.  He also recommended Night Force Scopes.  That is what he uses in the big sand box.  So that was the way I went.  Night Force 3.5-15X50 NFS.  Love it.  Dropped a Moose at 810 yards, one shot.  220gr Nosler Accubond
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Where is old Joe when we really need him?  Alaska Independence    Calling Illegal Immigrants "Undocumented Aliens" is like calling Drug Dealers "Unlicensed Pharmacists"
What Is A Veteran?
A 'Veteran' -- whether active duty, discharged, retired, or reserve -- is someone who, at one point in his life, wrote a blank check made payable to 'The United States of America,' for an amount of 'up to, and including his life.' That is honor, and there are way too many people in this country today who no longer understand that fact.

Offline gendoc

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #14 on: May 24, 2012, 12:50:47 PM »
thanks for tha reply rog, its 01:50 tomorrow where he is at now....so lets give him
coupla hours to get up, get coffee and check out tha latest here !!!!!!!!!!
he cannot reply, due to security. but he calls me frequently ;D
i bet he prolly knows your marine sniper friend ifin he has been active in the last 18 years ;)
he has provided his services to many "OTM" in that time. 8)
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sea-ya.....
in tha meen time, i'm wait'n for tha  7th trumpet ta sound !!!

gotta big green tractor ana diesel truck, my idea of heaven's chasin whitetail bucks and asa country boy, you know i can survive............

hey boy, hit this mason jar one time...
burn ya lil'bit did'nt it. ya ever been snipe hunt'n ?  come on...

I prefer dangerous freedom over peaceful slavery.

Offline gendoc

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #15 on: May 25, 2012, 08:21:50 AM »
rog,  j2 says  (copy & pasted from his text message)
 
 "very true about the heart beat, and the nf 50's are very nice and a great companion.
we have schmidt & bender 5-25x56 mk-II for all our distant targets.
we never range more than 15-18x for that exact reason.
the LM is our choice of champions and an occasional short mag within range ;) "
 
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sea-ya.....
in tha meen time, i'm wait'n for tha  7th trumpet ta sound !!!

gotta big green tractor ana diesel truck, my idea of heaven's chasin whitetail bucks and asa country boy, you know i can survive............

hey boy, hit this mason jar one time...
burn ya lil'bit did'nt it. ya ever been snipe hunt'n ?  come on...

I prefer dangerous freedom over peaceful slavery.

Offline bajabill

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Re: .30-378 Weatherby Magnum in .308 Win Heavy Barrel?
« Reply #16 on: May 30, 2012, 07:16:45 AM »
the 378 and 338 lapua are some big cases and may even be pushing the limits of standard Savage bolt action rifles and barrels.
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