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Shooting & Reloading - Mausers, Big Bores and others >> Rifles

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Woodbeef
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Reged: 30/12/06
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Loc: Badlands of Alberta

Which calibers are easily converted to 300 H&H?
#99118 - 13/03/08 11:24 AM

Ok,I let my M-17 go for a unbelievably good price,so now I'm back looking for a new rifle to convert. Besides 30-06,what else is easily convertable to 300 H&H? What about a 300 Win Mag?

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DarylS
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Reged: 10/08/05
Posts: 26526
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Re: Which calibers are easily converted to 300 H&H? [Re: Woodbeef]
#99119 - 13/03/08 11:32 AM

You would have to set the barrel back quite a ways on a .300 WM to eliminate it's larger shoulder interfering with the body taper of the .300.
: So - .308, .30/06 or .300 Savage could all be re-chamberd, then the additonal work done to the bolt face, extractor, and action rails for feeding.
: Any standard or magnum rifle can be re-barreled to .300 mag as long as the action is long enough.

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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9.3x57
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Reged: 22/04/07
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Re: Which calibers are easily converted to 300 H&H? [Re: DarylS]
#99122 - 13/03/08 11:57 AM

Just a thought, but maybe the easiest would be to get a .375 H&H Mag. Seems like a fellow can sometimes find one that a guy bought and then got scared of.

Anyway, since action work might add up quick for cost for some other caliber, a .375 H&H barrel should be able to be replaced with a .300 H&H and you should be golden. I don't think any action work would be necessary, and obviously the bolt face would be fine.

Just an idea.

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What are the Rosary, the Cross or the Crucifix other than tools to help maintain the fortress of our faith in Jesus Christ, the Son of God?

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szihn
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Reged: 24/06/07
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Loc: Wind River Valley, Wyoming

Re: Which calibers are easily converted to 300 H&H? [Re: 9.3x57]
#99133 - 13/03/08 01:35 PM

Any 300 Win Mag rifle would be a simple re-barrel job to make it into a 300 H&H. Setting the 300 Win barrel back is not practice because you'd loose too much barrel length.

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WyoJoe
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Reged: 18/02/04
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Re: Which calibers are easily converted to 300 H&H? [Re: szihn]
#99183 - 14/03/08 04:44 AM

Another route would be to take A Ruger #1 in .30/06 and have it rechambered. It is a relatively easy job.

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There comes a time when one must take a position that is neither safe, nor polite, nor popular -- but one must ask, "Is it right?"

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xausa
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Reged: 07/03/07
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Loc: Tennessee, USA

Re: Which calibers are easily converted to 300 H&H? [Re: WyoJoe]
#99186 - 14/03/08 04:58 AM

If you are interested only in performance rather than the benefits of the .300 H&H in reliable feeding, which is not all that significant, you can take any .30-'06 bolt action and have it rechambered to .30-.338 or .308 Norma Magnum (virtually the same cartridge), which will give you .300 H&H performance without the expense of a Magnum length action. Of course the bolt face will need to be opened up to accept the larger case head. Many a Springfield or Enfield has been converted that way.

.300 Winchester Magnum is another option, but you need to weigh the advantage of easily available factory ammunition against a case which requires to bullet to be seated too deeply in order to function in a standard length magazine. When I say "too deeply", I simply mean that a long bullet protrudes far enough into the powder chamber of the cartridge as to reduce the its case capacity.

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Tatume
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Reged: 09/06/07
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Re: Which calibers are easily converted to 300 H&H? [Re: xausa]
#99193 - 14/03/08 07:19 AM

Quote:

.300 Winchester Magnum is another option, but you need to weigh the advantage of easily available factory ammunition against a case which requires the bullet to be seated too deeply in order to function in a standard length magazine. When I say "too deeply", I simply mean that a long bullet protrudes far enough into the powder chamber of the cartridge as to reduce its case capacity.

This complaint, and the related complaint that the neck is so short that accuracy is affected, have been around for decades. However, the cartridge produces plenty of speed even if the bullet does protrude below the bottom of the neck. Also, the accuracy is sufficient for a Secret Serviceman at the 1000 yard match at Quantico to shoot a perfect score plus something like 20 additional Xs (if at the end of a target string a 200-20X is recorded, the shooter continues shooting until something other than an X is fired).

In my personal experience, I have never found the 300 Win Mag to be lacking in speed or accuracy.

Take care, Tom

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xausa
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Re: Which calibers are easily converted to 300 H&H? [Re: Tatume]
#99195 - 14/03/08 08:51 AM

There are certainly no flies on the .300 WinMag when shot in a single shot target rifle. When I was a member of the USMCR rifle team back in the 1960's that is what we used. However, 1000 yard target rifles don't have to feed rounds through the magazine, and generally don't even have magazines, so the bullets can be loaded out as far as necessary.

According to The Handloaders Manual of Cartridge Conversions the .30-.338 has a case capacity of 84.41 grains of water compared to 85.78 garins for the .308 Norma Magnum and 90.36 for the .300 WinMag. Any advantage gained by the 6 grains of water difference would be lost by deep seating the bullet.

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Tatume
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Re: Which calibers are easily converted to 300 H&H? [Re: xausa]
#99199 - 14/03/08 09:52 AM

Quote:

According to The Handloaders Manual of Cartridge Conversions the .30-.338 has a case capacity of 84.41 grains of water compared to 85.78 garins for the .308 Norma Magnum and 90.36 for the .300 WinMag. Any advantage gained by the 6 grains of water difference would be lost by deep seating the bullet.

I have no reason to doubt that this is true. On the other hand though, when loaded to a length that will feed through a standard-length magazine, the 300 Win Mag makes speeds that lie between the 300 H&H and the 300 WBY, both of which require a magnum-length action and magazine. The Win Mag is about 100 fps faster than the H&H, and about 100 fps slower than the WBY. What more could be asked of a cartridge with the overall length of a 30-06?

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Riodot
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Reged: 30/07/05
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Loc: Casa Grande, AZ

Re: Which calibers are easily converted to 300 H&H? [Re: Tatume]
#99579 - 19/03/08 05:43 AM

How about a Weatherby Vangard in 300 WBY. Seems to me it's just a rebarrel job only. I have been thinking of this one since I see these in Pawn shops and used gun racks quite often. I bought one new at Walmart 5 years ago and it kicked like a mule in the tupperware stock but came around nicely when I restocked it and added a decelorator pad. I am thinking of getting another one used and sending to ER Shaw to rebarrel. I really want a 300H&H.

Tell me if I am wrong here.

Lance

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CptCurl
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Reged: 01/05/04
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Loc: Fincastle, Botetourt County, V...

Re: Which calibers are easily converted to 300 H&H? [Re: Riodot]
#99616 - 19/03/08 09:37 AM

I doubt it will feed the .300 H&H from a magazine that was tuned to feed a .300 WBY. But really, I don't know a damn thing about a Weatherby Vangard, so my comment is probably crap.

Curl

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DarylS
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Re: Which calibers are easily converted to 300 H&H? [Re: CptCurl]
#99711 - 20/03/08 03:20 AM

If only the ballistics are desired - a .30/06IMP will deliver .300 H&H factory spec speeds in any M98 action.
; That's a simple re-chamber on any '06 or .308 even. Doing a .308 removes the necessity to pull the barrel- proper headspace for frieforming factory ammo can be maintained without setting the barrel back one turn.
; Indeed, Hornady's new light magnum ammo about duplicates original .300H&H factory ammo, and comes within 50fps of .300WSM.
; I hate belts when they aren't needed - and NO American ctgs. need a belt. Few years back, I chambered up an old 24" bl. .30/06 to .30/.338 without the belt. Excellent round, but only about 60fps ahead of my 26" barreled .30/06Imp. The .30/.338 duplicated my 24" .300Win mag as well. The max. efficient capacity of the .308 cal. is somewhere around 80gr. - about 3 gr. more than the '06IMP.
: My .375'06IMP has a 78/79gr. water capacity, depending on which '06 brass I use. Not far behind the 85gr. short mags, is it.
; I could never see burning an extra 15gr. or 20 of powder to get 100fps, but guys will do it and even an extra 50gr. of powder just to get 250fps. and from hunting positions they couldn't hit a moose or elk as 300yards let alone any further - Oh - am I ranting?
; If not building for nostalgic reasons, I'd go with a beltless .30/.338. You can use a .300 Win Mag reamer to cut the chamber. If a longer neck is desired, just hold the reamer back the appropriate amount and run the neck forward whatever extra you want with a neck throater from Dave at Pacific Tool and Gauge. Elementary stuff, this.

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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xausa
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Reged: 07/03/07
Posts: 2037
Loc: Tennessee, USA

Re: Which calibers are easily converted to 300 H&H? [Re: DarylS]
#99715 - 20/03/08 04:27 AM

I agree with virtually everything you say about unnecessary belts on "Magnum" cartridges. However, there is at least one American cartridge which requires a belt to headspace, and that is the .458 Winchester Magnum and its progeny, the Watts, the Lott and the American.

As for a .30/.338 without a belt, take a look sometimes at the .30 Newton, introduced in 1913 as the .30 Adolph Express. It, and its German counterpart the 8X68S are true beltless magnums (as is the largely ignored .284 Winchester).

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Woodbeef
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Reged: 30/12/06
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Re: Which calibers are easily converted to 300 H&H? [Re: DarylS]
#99725 - 20/03/08 06:36 AM

Not really looking for maximum speed there,Daryl. I'm looking for the adaptability of the 300 H&H to be able to load from 110 up to 250 grain bullets,the trajectory,and retained power down range. Plus it is available in factory loadings.

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Woodbeef
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Reged: 30/12/06
Posts: 82
Loc: Badlands of Alberta

Re: Which calibers are easily converted to 300 H&H? [Re: WyoJoe]
#99726 - 20/03/08 06:40 AM

Quote:

Another route would be to take A Ruger #1 in .30/06 and have it rechambered. It is a relatively easy job.

True,the guys over on the Ruger forum mentioned that too. Only need to rechamber,and change the extractor if you go with a No.1.

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