Author Topic: 376 Steyr....Range Report!!! (Read 3989 times)

quickdtoo · « **on:** May 08, 2012, 12:24:13 PM »

I finally decided on what .375" chambering I want, something different of course

, after a lot of him-hawing around I talked with Jess Ocumpaugh of JES Reboring and am sending my extra 7mm-08 barrel to him for rebore and rechamber to 376 Steyr.

I was gonna, and may still, go for a 375 H&H Ackley, but I'll wait to see how the 376 works out, I was gonna send a 26" 25-06 barrel and have it slimmed down to a sporter contour, but he doesn't turn down barrels, just bores and rechambers.

For those interested, the 376 Steyr has a .~~501"~~ .5061" case head and operates at a maximum of ~60kpsi, Hodgdon lists a 2600fps 260gr Nosler Partition load @ 54.5kpsi which provides way less breech thrust than a 65kpsi load in the 270 Win, so low to mid level handloads will work fine and a factory round shouldn't be hazardous should one ever get chambered. I'll be doing the underlug improvement on it also. It has a slightly rebated rim, but isn't rebated much compared to the 300WSM which worked fine as far as ejection/extraction.

Tim

http://www.35caliber.com/

http://www.steyrscout.org/376steyr.htm

http://ammoguide.com/?catid=158

OR-E-Gun Bill · « **Reply #1 on:** May 08, 2012, 12:51:47 PM »

Tim, Do ya have any pictures other than from brother Steve? Seems he's blocked some from looking at his stuff.

Bill

EDIT: Thanks for the attachment Tim. Guess I could have just opened the Hornady Manual...

quickdtoo · « **Reply #2 on:** May 08, 2012, 12:57:03 PM »

I attached it instead!

Tim

45-70.gov · « **Reply #3 on:** May 08, 2012, 12:59:48 PM »

sounds like a new favorite round

probly be great downloaded with cast too

quickdtoo · « **Reply #4 on:** May 08, 2012, 01:07:35 PM »

The biggest problem I see with it is the ~~shallow 15º~~ short 17º shoulder, I'd be concerned if only shooting factory ammo, but handloading won't be a problem, I did a little research on it, apparently Hornady dies were problematic at one time, so I ordered an RCBS full length die which is less money than a Hornady die set, I already have a 375H&H die set, the seater die should work with it just fine. Midsouth has the die for $44 and 50 Hornady brass($50) in stock.

Tim

EDIT: It appears the shoulder angle is incorrect on the Steve's pages diagram, Ammoguide lists it as 17º which is verified with SAAMI specs.

mechanic · « **Reply #5 on:** May 08, 2012, 01:16:57 PM »

Amazing you can get dies, etc. for just about any conceivable caliber......and this should be a good one! Tim, I hope you live long enough to wear all these custom Handi's out!

Ben

quickdtoo · « **Reply #6 on:** May 08, 2012, 01:18:37 PM »

Thanks Ben, I no doubt won't live long enough to wear any of em out, but I should have fun trying!!

Tim

mechanic · « **Reply #7 on:** May 08, 2012, 01:34:37 PM »

Looks like another good reason to be glad for the Lead Sled!!!! But impressive ballistics at 200+yds.

Ben

Smokin Joe · « **Reply #8 on:** May 08, 2012, 01:58:46 PM »

Tim, you goin' Sasquatch huntin' up there??

LAB55 · « **Reply #9 on:** May 08, 2012, 02:14:37 PM »

That's going to be a good cartridge! I sent my 223 barrel to JES a few months ago and he sent it back as a 375 Whelen Imp. Been having a good time fireforming cases and reloading for it. It will throw a 235 sp 2475 fps and a 270 gr sp 2350 fps. Haven't tried any 300 gr bullets yet.
Keep us posted on your loads and how it shoots when you get it back.
What rate of twist are you going with?

Dinny · « **Reply #10 on:** May 08, 2012, 10:16:06 PM »

Is that 7mm-08 barrel a superlite?

Now that would be one for Tyler to shoot!!

Can the Steyr be made from any rimmed brass?

Thanks, Dinny at KAF

scratchmark · « **Reply #11 on:** May 08, 2012, 11:17:45 PM »

Underlug improvement? Tell me more.

petemi · « **Reply #12 on:** May 09, 2012, 12:19:52 AM »

It sounds like fun Tim. Good luck with it.

Pete

bikerbeans · « **Reply #13 on:** May 09, 2012, 12:39:02 AM »

Quote from: scratchmark on May 08, 2012, 11:17:45 PM

Underlug improvement? Tell me more.

IIRC it is in the FAQs. I love getting to say that before Tim does.

Tim,

Will JES do a .366 rebore? If you Build a 9.3x74R Richard will be knocking on your door begging to see it.

BB

jedman · « **Reply #14 on:** May 09, 2012, 01:27:44 AM »

The .376 Steyr could be formed on 45-90 brass for a rimmed version. Jedman

Dinny · « **Reply #15 on:** May 09, 2012, 02:04:40 AM »

Quote from: jedman on May 09, 2012, 01:27:44 AM

The .376 Steyr could be formed on 45-90 brass for a rimmed version. Jedman

Awesome!!

Thanks, Dinny

dpe.ahoy · « **Reply #16 on:** May 09, 2012, 02:06:00 AM »

Sounds like a sweet set-up ya got planned Tim!! Using 45-90 brass like Jedman suggested would give you a rim for the extractor to grab $:-\$ , but the 376 Steyr is a nice cartridge that deserves more exposure than it has had. Looking forward to hearing all about it. Now where is that thread on the lug improvement? My CRS has been acting up bad, know I read it, can't 'member what it was.

DP

dpe.ahoy · « **Reply #17 on:** May 09, 2012, 02:11:33 AM »

Hornady shows the 376 as running neck and neck with the 375 H&H with their bullets.

Even down loaded some it is still a thumper! Hey Rog, you following this? Might work pretty nice up north in a Handi. DP

bikerbeans · « **Reply #18 on:** May 09, 2012, 02:15:02 AM »

Quote from: dpe.ahoy on May 09, 2012, 02:06:00 AM

Now where is that thread on the lug improvement? My CRS has been acting up bad, know I read it, can't 'member what it was. DP

http://www.gboreloaded.com/forums/index.php/topic,110568.msg1098335003.html#msg1098335003

dpe.ahoy · « **Reply #19 on:** May 09, 2012, 02:17:00 AM »

Thanks BB!! Now I gots me some readin' to do! DP

Dinny · « **Reply #20 on:** May 09, 2012, 02:47:11 AM »

BB,
Jes does offer a .366" rebore, but his chamber list doesn't include 9.3x74R. He might do it, but one would have to inquire.

http://www.35caliber.com/8.html

Personally the 74R would get my nod. In fact, it would be a prime option if the Army ever wisens up and sends me to AK.

I would do it on a 26" Handi barrel too.

http://www.chuckhawks.com/9-3x74R.htm

A trip down reality lane made me realize I would need to win the lotto before pursuing this project.

http://www.hornady.com/store/9.3x74R/

Thanks, Dinny at KAF

muznut 54 · « **Reply #21 on:** May 09, 2012, 03:08:32 AM »

Tim how much does that guy charge to re bore a single shot barrel?

bajabill · « **Reply #22 on:** May 09, 2012, 03:17:48 AM »

I am interested in how you were thinking of a belted mag in a handi.

quickdtoo · « **Reply #23 on:** May 09, 2012, 04:08:44 AM »

Quote from: LAB55 on May 08, 2012, 02:14:37 PM

What rate of twist are you going with?

~~12"~~ 14" twist, 3-groove

Quote from: -Dinny on May 08, 2012, 10:16:06 PM

Is that 7mm-08 barrel a superlite? Now that would be one for Tyler to shoot!! Can the Steyr be made from any rimmed brass?

Thanks, Dinny at KAF

No on the Superlight, but it crossed my mind, I even checked with Brian to see how many he had left just in case, but after removing that much metal from a standard 7mm-08, I wanta see how much it weighs. Jesse did say he would do the 7mm-08 Superlight tho. I have a 243 Superlight barrel that has sights, he won't do it because the rear sight holes are too deep, almost .200"!

The Steyr can be made from ~~.284 Win and~~ 9.3x64 also, ~~the 9.3x74R would be another option from my 26" 25-06 barrel~~, but it's too bad he won't turn barrels down a bit. $:-\$

He requires the reamer to have a floating pilot, won't use a solid pilot.

Quote from: muznut 54 on May 09, 2012, 03:08:32 AM

Tim how much does that guy charge to re bore a single shot barrel?

$225 for a 3-groove, $250 for 4 or 5 groove including the rechamber if he has the reamer, add $60 if he has to rent a reamer, return shipping is included.

Quote from: bajabill on May 09, 2012, 03:17:48 AM

I am interested in how you were thinking of a belted mag in a handi.

A 375H&H Ackley loaded to 375 H&H Flanged pressures, doing the Ackley version would insure that if by chance anyone ever did load a factory round in it, the pressure in the Ackley chamber would be 37.1kpsi as predicted by QL and the improved chamber should reduce breech thrust some over the tapered parent round.

Tim

PS Joe, I'll save the 499HE for the Sasquatches!!

RPRNY · « **Reply #24 on:** May 09, 2012, 05:12:58 AM »

Congratulations on the 376 Steyr. It's an interesting cartridge.

But once again, GBO has been a very bad influence. I had just gotten over my urge to buy a Marlin 336 in 35 Rem because finding them in a straight grip "Texan" is difficult and expensive. So I had settled into just loving my 30-30 Texan. And now I learn about the 35x30-30 perusing the JES website. Damn!

AtlLaw · « **Reply #25 on:** May 09, 2012, 06:38:46 AM »

Quote from: quickdtoo on May 09, 2012, 04:08:44 AM

the 9.3x74R would be another option from my 26" 25-06 barrel,

Tim, you told me the 9.3x74R wouldn't clean up a .280 chamber as per AmmoGuide. It says the same thing for the 25-06. Am I missing something? $:-\$ I sure hope I am!

quickdtoo · « **Reply #26 on:** May 09, 2012, 07:04:05 AM »

You're right Richard, darn CRS!!!

Depending on the donor barrel's chamber, it might possibly be worked around by removing material from the barrel face to effectively set the barrel back some and reffiting to the frame, otherwise you'd be limited to a 24" barrel length which may not be all that bad, a .223 Ultra Varmint barrel for instance.

Tim

quickdtoo · « **Reply #27 on:** May 09, 2012, 10:18:59 AM »

I talked to Jesse one more time before shipping the barrel off, he normally does a 14" twist in his .375s, so that's what I'll do, I won't be shooting anything bigger than 270gr, but even a 300gr Barnes TSX has a Miller stability factor of 1.485 at 1500fps, anything between 1.2 and 2.0 is good to go, the military uses 1.5. With a MV of 2400fps(54kpsi) it would still be moving almost 1650fps at 400yds, farther than I'll ever shoot!

Tim

twoshooter · « **Reply #28 on:** May 09, 2012, 04:12:18 PM »

Best wishes on the project...... of course the Steyr is the parent cartridge for the 338 Marlin,,,,, thereby starting the beginnings for a whole new family !!

PHATINJUN · « **Reply #29 on:** May 10, 2012, 06:00:03 AM »

Tim good to see your on a new and differant project . Good luck have fun. Kurt