.300 H&H conversion on Mauser 98k action?

orsogato · March 14, 2021, 08:17 AM

Looking at a rifle in LGS that is a Mauser 98k action converted to .300 H&H magnum. My guess is whoever did this conversion had to remove material from the front lug, possibly the feed ramp etc. to make room for the longer overall cartridge length of the old H&H cartridge. It has a one piece old Redfield scope base and rings.

Asking price is $450 (I'm sure probably negotiable).

Anybody have any experience with converting a standard length Mauser 98k action to .300 H&H, or is this a terribly bad idea and I'm asking for a rifle to blow up in my face if I buy this?!?

The action is a World War 2 production era. It has the Waffenampts visible, although the scope base is covering up the manufacturer's letter code. My guess is the whole setup was probably done in the 1950s when the .300 H&H was the only next step up in .30 cal horsepower from the .30-06' (but that's just a wild ass guess).

Paul B. · March 14, 2021, 02:17 PM

Tat was acommon conversion back in the day. Holland and Holland did it for the .300 and .375 H&H guns, Weatherby used FN Mauser actions at first for the .300 Weatherby and .375 Weatherby. Check out a Mark X Mauser in .375 H&H, just a standard Mauser opened up to take the longe cartridge. About the only thing I would check is run your finger over the top of the feed ramp for roughness. I had a Mark X in .375 and the top of the feed ramp literally had teeth like the shark in Jaws. They cut some deep gouges in my brass that are not only unsightly but question the integrity of the cartridge case sidewalls, IMHO.

Paul B.

orsogato · March 14, 2021, 07:53 PM

Thanks for the input.

T. O'Heir · March 15, 2021, 01:08 PM

.300 H&H ammo and brass won't be easy to find. Look into that before doing anything rash. None of the usual on-line sites have any.
However, there is/was a 'Magnum' length Mauser action that looks just like a K98. I"d be thinking the mag well length would matter too.
Have a look at this one. There's a link to watching the thing being built.
https://www.dorleac-dorleac.com/arme...-game/?lang=en

Scorch · March 16, 2021, 02:39 AM

Quote:

Holland and Holland did it for the .300 and .375 H&H guns

H&H used square bridge magnum length actions.

I am not a fan of magnum cartridge conversions to K98 actions because of the soft steel they were made of. After any action work like this you have to re-carburize the action because you end up taking so much of the action away to get the rifle to feed.

orsogato · March 16, 2021, 09:13 AM

Scorch - that was my hesitation. Too much material being removed.

T. - It may be a pain in the ass, but I was thinking if worse comes to worse brass can be formed from .375 H&H cases. By the way, those rifles are beautiful on that link you provided!

Jim Watson · March 16, 2021, 09:49 AM

Quote:

H&H used square bridge magnum length actions.

Until they could not get them any more. Then they adapted the standard Mauser.

March 14, 2021, 08:17 AM	#1
orsogato Senior Member Join Date: July 20, 1999 Location: Steeler Country Posts: 628	.300 H&H conversion on Mauser 98k action? Looking at a rifle in LGS that is a Mauser 98k action converted to .300 H&H magnum. My guess is whoever did this conversion had to remove material from the front lug, possibly the feed ramp etc. to make room for the longer overall cartridge length of the old H&H cartridge. It has a one piece old Redfield scope base and rings. Asking price is $450 (I'm sure probably negotiable). Anybody have any experience with converting a standard length Mauser 98k action to .300 H&H, or is this a terribly bad idea and I'm asking for a rifle to blow up in my face if I buy this?!? The action is a World War 2 production era. It has the Waffenampts visible, although the scope base is covering up the manufacturer's letter code. My guess is the whole setup was probably done in the 1950s when the .300 H&H was the only next step up in .30 cal horsepower from the .30-06' (but that's just a wild ass guess). Last edited by orsogato; March 14, 2021 at 08:34 AM.

March 14, 2021, 02:17 PM	#2
Paul B. Senior Member Join Date: March 28, 1999 Location: Tucson, AZ Posts: 3,801	Tat was acommon conversion back in the day. Holland and Holland did it for the .300 and .375 H&H guns, Weatherby used FN Mauser actions at first for the .300 Weatherby and .375 Weatherby. Check out a Mark X Mauser in .375 H&H, just a standard Mauser opened up to take the longe cartridge. About the only thing I would check is run your finger over the top of the feed ramp for roughness. I had a Mark X in .375 and the top of the feed ramp literally had teeth like the shark in Jaws. They cut some deep gouges in my brass that are not only unsightly but question the integrity of the cartridge case sidewalls, IMHO. Paul B. __________________ COMPROMISE IS NOT AN OPTION!

March 15, 2021, 01:08 PM	#4
T. O'Heir Senior Member Join Date: February 13, 2002 Location: Canada Posts: 12,453	.300 H&H ammo and brass won't be easy to find. Look into that before doing anything rash. None of the usual on-line sites have any. However, there is/was a 'Magnum' length Mauser action that looks just like a K98. I"d be thinking the mag well length would matter too. Have a look at this one. There's a link to watching the thing being built. https://www.dorleac-dorleac.com/arme...-game/?lang=en __________________ Spelling and grammar count!

March 16, 2021, 09:13 AM	#6
orsogato Senior Member Join Date: July 20, 1999 Location: Steeler Country Posts: 628	Scorch - that was my hesitation. Too much material being removed. T. - It may be a pain in the ass, but I was thinking if worse comes to worse brass can be formed from .375 H&H cases. By the way, those rifles are beautiful on that link you provided! Last edited by orsogato; March 16, 2021 at 09:18 AM.

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March 14, 2021, 07:53 PM	#3
orsogato Senior Member Join Date: July 20, 1999 Location: Steeler Country Posts: 628	Thanks for the input.