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Old August 7th, 2018, 09:38 PM #1
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Krag 30-40 Action, Conversion to other calibers possible?

To get this part out of the way first: I intend to do this as a random parts build first and foremost. That out of the way, I want to know the feasibility of setting up a Krag in something other than 30-40 Krag.

I would like to know what other calibers I could consider setting one up in for fun as getting 30-40 Krag (or just components to load for it) can be a pain at times. Plus, I love the action of Krags and would shoot this alot, so having a common source ammo would be great. So, anyone got any ideas or knowledge to share?
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Old August 7th, 2018, 09:41 PM #2
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How does it match up to 303 British? I guess you would still need .30 bullets though
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Old August 7th, 2018, 09:48 PM #3
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Do you own any Krags and are you familiar with their mechanical functioning?

The rimmed case and magazine, being designed specifically for that rifle, may be difficult to overcome.

Are you thinking of going with an 8mm Mauser/.30-06 rimless parent case for your build?

The first thing I would try is .30-30 Winchester. The Krag case rim is .040 inches bigger in diameter though. Based on the two cases I just measured.
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Old August 7th, 2018, 10:24 PM #4
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444 marlin is about the only other cartridge I can think of that is worthy of the conversion for a US rifle. 6.5x55 would be another but not really a conversion because rifles can already be found chambered as such.
Cartridge pressure should be the primary concern because of the design with only one locking bolt.
30/40 is what I would stick with. Plenty of bullet selection, brass is out there and you can get a CBI rifle or carbine barrel from the cmp.
I just rebuilt a shooter rifle not long ago that can be seen in the gunsmith forum. Pretty easy to do at home and fun to do.
Krags are beautifully made rifles but a little quirky in comparison to the later service rifles.
Especially the trigger group but easy once you study the mechanism.
I’m trying to obtain a bubba’ed example now for something to do.
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Old August 7th, 2018, 10:32 PM #5
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I don't own any Krags but know their basic functioning from using a friend's and examining more than a few in greater detail than just eyeballing it (taking down actions and such for deep cleaning).

That being said, I want to get my hands on an action for myself as I might end up going a bit... extreme with this. I wonder if there would be a market for a Krag-style rifle in a modern caliber? (and for the record the patents on the Krag are all long expired).
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Old August 7th, 2018, 10:36 PM #6
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Quote:
Originally Posted by Cruacious View Post
I don't own any Krags but know their basic functioning from using a friend's and examining more than a few in greater detail than just eyeballing it (taking down actions and such for deep cleaning).

That being said, I want to get my hands on an action for myself as I might end up going a bit... extreme with this. I wonder if there would be a market for a Krag-style rifle in a modern caliber? (and for the record the patents on the Krag are all long expired).
This country's firearm manufacturers couldn't produce a Krag action.

Too much attention to detail would be required.

Manufacturers barely deburr their work.
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Old August 7th, 2018, 10:57 PM #7
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You would really want to have to do it. Compound radius curves on the inside plus the complicated exterior have fun.
Most would have to completely strip the loading gate and pop the side plate off one to appreciate them. Unbelievable machine work.
I think a Garand action is like 279 separate machining operations, a Krag has got to be right up there or more.
If it didn’t have a split bridge, one bolt lug and a trigger that moved downward as it moved rearwards with a starboard mounted box it would just be a Mauser.
Have fun.
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Old August 7th, 2018, 11:00 PM #8
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I believe the Krag is 119 separate operations for the receiver alone.
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Old August 7th, 2018, 11:17 PM #9
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Keep in mind, the Krag is NOT I repeat, NOT the strongest action out there. Contrary to what some may think and say... ONE locking lug. The 30/40 is really a pretty good damn round as it is. Being well over 100 years old I load DOWN for it, not up.
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Old August 7th, 2018, 11:22 PM #10
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The Krag has three points that take chamber pressure when being fired.

A locking lug on the bolt/chamber.

A machined rib on the bolt body that meshes with the receiver.

And the receiver recess that houses the bolt handle.
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