hr rechamberd to 30-40 krag - Graybeard Outdoors
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post #1 of 15 (permalink) Old 07-08-2019, 11:56 AM Thread Starter
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Default hr rechamberd to 30-40 krag

got this 158 30-30 barrel,it has been rechamberd to 30-40 krag. question is it fits one of my sb1 frames very good. would this be safe to fire factory 30-40 krag?
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post #2 of 15 (permalink) Old 07-08-2019, 04:01 PM
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The 30/30 is actually rated at slightly higher CUP (42k vs 40k) so you should be fine with factory ammo.
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post #3 of 15 (permalink) Old 07-08-2019, 06:33 PM
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The 30-30 has a SAAMI MAP of 42kpsi, the 30-40 is rated at 40kcup, so you can't make a comparison with those numbers, the old 30-30 spec was 38kcup for comparison. The 44mag has the same .457" case head size and old MAP of 40kcup, and was factory chambered on SB1 rifles as well as the M155 Shikari and M158, an SB1 frame should be fine as long as the underlug on the 158 barrel is welded and not soldered onto the barrel, then it could be questionable as being safe.

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post #4 of 15 (permalink) Old 07-08-2019, 07:58 PM Thread Starter
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it appears to be soldered to me. seems to me if thats an issue then it would not be safe on any frame?
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post #5 of 15 (permalink) Old 07-08-2019, 09:17 PM
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If you just gotta shoot it and don't have another Krag that could cross-contaminate ammo, you could try reloading cast plinking loads using the generic TrailBoss guidelines:

https://www.hodgdon.com/wp-content/u...loads-2018.pdf
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post #6 of 15 (permalink) Old 07-08-2019, 09:29 PM
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Quote:
Originally Posted by robbymoore92068 View Post
it appears to be soldered to me. seems to me if thats an issue then it would not be safe on any frame?
Sounds like the barrel is the question mark. You could have welded tho it would mess up the bluing. Could always paint the barrel. Krylon camo black is similar to factory matte black barrels.
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post #7 of 15 (permalink) Old 07-09-2019, 11:04 AM
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I have an early M158 30-30 barrel with soldered underlug, I considered rechambering it to 30-40, maybe even 30-40 Improved, but decided it wasn't the best idea. It may very well be just fine, and it certainly would be on a welded barrel. If the 44 mag was available on the Shikari before the late 70s while the underlugs were still soldered, then I'd say it's fine, but in 1972 when the Shikari was introduced, it was only available in 45-70 which has a comparable breech thrust to the 30-30, I don't know when the 44 Mag Shikari started production. Anyone have an early 44 Mag Shikari or M158/58 with a soldered underlug?

Tim

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post #8 of 15 (permalink) Old 07-09-2019, 11:40 AM Thread Starter
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my intentions from the start were to load this rifle to about 1700 fps with a 125 or 150 gr jacketed bullet . my goal is a 150 yard deer/hog gun with mild recoil. do you guys think this rifle could handle a load really close to those specs? then my concern is if the rifle ends up with someone else and is marked 3040 and they use factory ammo. it is still marked 30-30 win.
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post #9 of 15 (permalink) Old 07-09-2019, 11:51 AM
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Personally, I would not consider a soldered lug unsafe but would not want to try hot rodding it. Many barrels had soldered lugs in the past and saw years of use, although a few occasionally lost their lugs. I am capable of replacing a lug but a person who is not might not want to spend the money to have a professional do the work.

The easiest fix is to make a custom lug with greater barrel contact area and silver solder it to the barrel. Other options are dovetailing or screwing a lug onto the barrel if it is thick enough or making a barrel band lug. Any of these fixes will require stock work to make the forearm work with the new lug.

Using factory spec 30-40 ammo, the OP would have a good 200 yard deer, elk, moose or bear gun.

ADDED: I was thinking forearm lug. Still would consider it safe but a couple of tig tacks on each side of the lug might increase its strength but could easily destroy the barrel if too much heat is input.

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Now, with special thanks to the Truman Museum and Harry himself, you and I finally have a full understanding of what "POLITICAL CORRECTNESS" really means.....

Last edited by ulav8r; 07-10-2019 at 09:39 PM. Reason: Clarified original post thinking.
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post #10 of 15 (permalink) Old 07-09-2019, 12:00 PM Thread Starter
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the lug that holds the forearm on appears to be welded i think quikdtoo is talking about lug that attaches the barrel to the fame?
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