Author Topic: 9.3x74r handi... uhh make that .375 H&H Flanged handi (Read 3828 times)

jason045 · « **on:** February 23, 2011, 04:28:03 PM »

I just acquired myself a new sb2 frame and have decided I wanted something different. Thought about .338 fed, .358 win and .405 win. After doing a little research I reeealy want a 9.3x74. I searched old posts and found where a couple a fellas thought about it but couldnt find if anyone ever followed through. Tim, did you ever find someone who would rebore to .366?

Changed the subject to reflect the turn the discussion has taken

Dinny · « **Reply #1 on:** February 23, 2011, 04:55:23 PM »

I don't know much about the 9.3x74r, but a 358 Win Handi would be the cat's meow. I have an encore but wish everyday that it was a Handi.

Thanks, Dinny

jason045 · « **Reply #2 on:** February 23, 2011, 05:13:30 PM »

Dinny, according to my barnes manual the 9.3x74 will shoot a 250 grain tsx @ 2445fps out of a 24" barrel at a modest 44kpsi. Probly get 2500 out of a 26" 25-06 rebore which is what I would like to go with if this is doable. Definitely would be unique.

Dinny · « **Reply #3 on:** February 23, 2011, 05:16:40 PM »

Quote from: jason045 on February 23, 2011, 05:13:30 PM

Dinny, according to my barnes manual the 9.3x74 will shoot a 250 grain tsx @ 2445fps out of a 24" barrel at a modest 44kpsi. Probly get 2500 out of a 26" 25-06 rebore which is what I would like to go with if this is doable. Definitely would be unique.

So it would basically be a rimmed 35 Whelen??

Thanks, Dinny

quickdtoo · « **Reply #4 on:** February 23, 2011, 05:22:26 PM »

Wayne doesn't do .366" rebores, so I never looked any further, it would be cool to have, but my 22" 35 Whelen Improved Handi will push a 250gr Hornady 2650fps, so I don't really "need" it either.

I'm sure there's someone out there that will do a rebore for ya.

Tim

Dinny · « **Reply #5 on:** February 23, 2011, 05:31:10 PM »

Here's a few others to try.

http://www.redmansrifling.com/reboring.htm

http://www.cutrifle.com/reboring.html

http://www.35caliber.com/

http://www.z-hat.com/Rebore.htm

**http://www.deltagunshop.com/clearwater_reboring/calibers_twist_rates.html**

Thanks, Dinny

jason045 · « **Reply #6 on:** February 23, 2011, 05:35:24 PM »

Tim, I think you said it best in one of the older posts I read tonight. The 9.3x74 is for the fella that wants somethin no one else has.

Thanks for the links, Dinny.

Dinny · « **Reply #7 on:** February 23, 2011, 05:39:29 PM »

Quote from: jason045 on February 23, 2011, 05:35:24 PM

Thanks for the links, Dinny.

No problem, Clearwater is pricey, but I hear they do phenomenal work.

Thanks, Dinny

jason045 · « **Reply #8 on:** February 23, 2011, 05:47:15 PM »

On a side note, my dad is right now building for himself a .375 H&H flanged double. It is fairly low pressure as well and might be great in a handi. Plus he already has reamer, dies, brass etc. Seems like he told me it does a 300gr in the 2500fps range

OBXPilgrim · « **Reply #9 on:** February 24, 2011, 11:07:26 AM »

Quote from: jason045 on February 23, 2011, 05:35:24 PM

The 9.3x74 is for the fella that wants somethin no one else has.

Like a rifle with no brass?

I looked at the thoughts of one for a while, much better choice than 35 whelen if you want to do cast bullets (which was my attraction - although 35 Winny wouldn't be bad either). The same molds for 35 Win/35 Whelen would be used, but paper patched. I never did find anyone that did .366" rebores either. Any then the brass thing came to light. I can have lots for fun for much less than $1 a pop for brass.

jason045 · « **Reply #10 on:** February 24, 2011, 11:58:01 AM »

A buck apiece for brass for brass aint too hateful. Heck, I paid more than that for my .500 brass. Plus with its operating pressures, I suspect they would last through many reloads The .375 H&H flanged brass runs 53.99/20 from grafs. I may look into it a little deeper as well. Im thinking all it would require is just a simple rechamber of a 38-55 barrel right Tim? 300gr @2500 fps in a handi is impresssive. I know the 45-70 will do this as well but the .375's bullets have a higher s.d and b.c. at lower pressure than the maxed out 45-70 loads.

rockrat · « **Reply #11 on:** February 24, 2011, 01:06:55 PM »

Bore/groove dia. of the 38-55 is too large for the 9.3 x 74R. Now, you could rechamber it to 38-72Win. It will push a 270gr @2,450fps easily. I think that an '06 might be too large at the shoulder for a 9.3 x 74R re-bore , but a 30-30 barrel should work fine.

Only drawback with the 38-55 barrels is that the bores are oversized, at least mine was, to where shooting a .375" diameter bullet is an exercise in futility. .377" work fine.

jason045 · « **Reply #12 on:** February 24, 2011, 01:13:53 PM »

So rechambering a 38-55 barrel to .375 H&H flanged would be a no-go then?

quickdtoo · « **Reply #13 on:** February 24, 2011, 01:22:37 PM »

No on the 38-55 to anything that uses .375" bullets, I've shot 235gr Speers thru one of mine at 375 Win velocities, they all hit the target at 100yds, but all were sideways!

Tim

oldsoldja · « **Reply #14 on:** February 24, 2011, 01:51:53 PM »

oh I like keyholes i had a 44 mag that would go sideways if I forgot to take the shot choke off.

gendoc · « **Reply #15 on:** February 24, 2011, 02:04:24 PM »

sound lika gud plan..... gunna be hard ta beat tha whelen ifin its right !!!

manatee1947 · « **Reply #16 on:** February 24, 2011, 02:29:01 PM »

If you have a Whelan, consider the 358009 Lyman mold, it is a 280 gr RNGC. Lyman lists loads up to 2350 fps not too shabby. The 9.3x74 sounds cool though, the handi seems to me to do better with long slim cartridges, or am I wrong in that assumption ??

Darreld Walton · « **Reply #17 on:** February 25, 2011, 02:25:14 AM »

Besides cast bullets in a .377 or bigger bore, the Barnes "Original" 250 in .377 cured the keyholes in my old Winchester M94 rifle chambered to .38-55. You ain't likely to take 'em out and perforate pop cans with it at their price, but it is a good hunting bullet!

gcrank1 · « **Reply #18 on:** February 25, 2011, 06:11:13 AM »

With the right rented throating reamer you could end up with that Holland's working, but with a larger neck and throat to use the available bullets for the 38-55 bore. I kinda hate the thought of using all that much powder just to hurt me.
But, if you must have more powder capacity I 2nd the notion on making the 38-55 chamber longer, if brass is available (just because its cataloged does not mean available, I found out!).

jason045 · « **Reply #19 on:** February 25, 2011, 02:14:20 PM »

I havent called them but Graf's specifically says "in stock" on the item page. If not my pops has like 170 brass and Im sure he could spare a couple dozen. He has all but sold me on making a go at the H&H. The more I though about it, Dinny was right. The 9.3x74 aint much more than a rimmed whelen. Now the question of whether to use a 38-55 and simply ream, but have to use .377 projectiles or reboring my 26" 25-06 and using whatever bullet I want.

Troyboy · « **Reply #20 on:** February 26, 2011, 05:17:05 AM »

I am glad you brought this up as I have been thinking of this rechamber myself. The thing is I am wanting to do both a 300H&H and a 375H&H. It sure would be cool to have both of them. Keep us posted with your progress and where you are getting the work done.

jason045 · « **Reply #21 on:** February 26, 2011, 06:24:47 AM »

Keep in mind I'm talking about the .375 H&H Flanged which operates at just 47kpsi and not the .375 H&H Belted which operates at 62kpsi. The .300 H&H's max saami pressure is 54kpsi.

quickdtoo · « **Reply #22 on:** February 26, 2011, 06:46:09 AM »

Quote from: jason045 on February 26, 2011, 06:24:47 AM

The .300 H&H's max saami pressure is 54kpsi.

That's not true, you're confusing CUP and PSI, the 300H&H operates at the same pressure as the 300 Win Mag, 54kcup which is 64kpsi. The 300H&H also shares the same .513" case head of the 300Win Mag which makes both unsuitable for an H&R.

Tim

http://kwk.us/pressures.html

http://www.lasc.us/SAAMIMaxPressure.htm

Troyboy · « **Reply #23 on:** February 26, 2011, 07:50:46 AM »

There goes that

You would think If you loaded cast you could get away with it.

Dinny · « **Reply #24 on:** February 26, 2011, 08:21:15 AM »

Quote from: Troyboy on February 26, 2011, 07:50:46 AM

You would think If you loaded cast you could get away with it.

What happens that one time when a factory round is fired?

Thanks, Dinny

quickdtoo · « **Reply #25 on:** February 26, 2011, 08:44:50 AM »

You could always mark the barrel for reduced loads only.

Tim

http://www.gboreloaded.com/forums/index.php/topic,228171.msg1099268715.html#msg1099268715

gcrank1 · « **Reply #26 on:** February 26, 2011, 08:56:08 AM »

Pretty nicely done stamping; one of your's?

jason045 · « **Reply #27 on:** February 26, 2011, 10:23:33 AM »

Although I wasnt touting the .300 H&H for use in a handi, thanks for clearing that up, Tim. Im not wrong in assuming that the .375 H&H Flanged would be a suitable handi caliber am I? The max pressure is 3,250 BAR or 47,100 PSI according to wikipedia. Rim diameter is .565", head diameter just forward of the rim is .517.

quickdtoo · « **Reply #28 on:** February 26, 2011, 11:37:43 AM »

Rim diameter isn't a factor in calculating breech force, for a ball park estimate you can use the same formula that ballistician Johan Loubser uses at Accurate Arms, use the case head diameter to calculate area, times the pressure, in this case it would be ~~8754~~ 9888 PSI, so yes, it would be fine. Actual pressure would be less since the internal case head diameter is the surface the pressure works against as far as breech force is concerned.

Tim

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

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

quickdtoo · « **Reply #29 on:** February 26, 2011, 11:49:59 AM »

Quote from: gcrank1 on February 26, 2011, 08:56:08 AM

Pretty nicely done stamping; one of your's?

Not mine, it's Deacon's in the link I included.

Tim