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Discussion Starter #1
does anyone have the 375x39mm(or equivalent)? i'm interested in the 375x39 for deer/black bear hunting.
 

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The 7.62 x 39 case does not seem to be a very good parent for the .375" bore. Most work for a similar wildcat seems to be on the 308 based case. Don't know the current status, but the 375 Reaper in this link shows a very small shoulder for headspacing: https://www.thefirearmblog.com/blog/2014/06/27/another-new-ar15-round-375-reaper/

The 375 Raptor is another slightly longer one: https://www.thefirearmblog.com/blog/2016/10/21/new-308-based-cartridge-375-raptor/

The 375 Whisper is based on the 7 BR case: 375 WHISPER | Cartridgecollector.net
 

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Interesting idea, but with a shoulder diameter of .396, I wonder if that makes a shoulder sufficient enough to headspace on? Looking at a slightly shorter .308 necked up to .375 maybe a better option? Just pondering.................................
 

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Discussion Starter #6
Hmm you got me thinking. .
i was thinking about a howa mini action hvb in 7.62x39 and rebore/rebarrel it to .375". a 200-250gr cast boolit fn gc going around 1700-1900fps should kill deer/black bear out to 150 yards.



The 7.62 x 39 case does not seem to be a very good parent for the .375" bore. Most work for a similar wildcat seems to be on the 308 based case. Don't know the current status, but the 375 Reaper in this link shows a very small shoulder for headspacing: https://www.thefirearmblog.com/blog/2014/06/27/another-new-ar15-round-375-reaper/

The 375 Raptor is another slightly longer one: https://www.thefirearmblog.com/blog/2016/10/21/new-308-based-cartridge-375-raptor/

The 375 Whisper is based on the 7 BR case: 375 WHISPER | Cartridgecollector.net

they are in caliber pairs from left-to-right: 8mm, .338, .358, .375, and .416 with the Kurz case on the left and the x39 on the right in each pair.(got it on some post)

buying a mini chop saw and the jig isn't for me, that leaves the reaper and the raptor out. i was looking at the cases that i could reload. starline has 7.62x39 galore. the 7.92x33 kurz(8mm kurz) should be a good case, but buying cases is a concern( https://www.grafs.com/retail/catalog/category/categoryId/778/inline/1 ). that was enuff to stop the kurz right there. i don't know the rim dia and all that to make it work in a howa mini action. the x39 case dia should be enuff to make the bolt action work. the magazine should be ok, but i expect that it will need some twerks.

i'm wondering if the 375x39 should have a ackley shoulder put on it? hhhmmmm...a 375x39 ai....thats gots me thinkin.......the case will be blown out, leaving the shoulder to headspace with..........i'll have to think on that one.......
 

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Another thought, unless you really want that mini Mauser action. If you could settle for a lever action, or a bolt action based on a 30-30 case head, or a single shot action, a cartridge that could 'scratch your itch' is the 375 Super Mag. I have one in a Dan Wesson revolver. It's a neat cartridge and easy to make cases from 30-30 or 38-55 or 375 Win. cases. See comparison photo.
 

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Nothing really wrong with it per se...headspace on the mouth and it would have just enough taper to the case...USE BRASS CASES NOT STEEL CASES.

It's basically a low velo, straight walled "Whisper" cartridge and I wouldn't use it for bear although many use similar cartridges effectively...and has been mentioned there are several better cases to use or already available, BUT who knows for sure until you try it.

Even with a flat based bullet loaded maybe 0.100-0.125" deep the case volume would be down around 30 gr H20 or below...

Besides there is already the 375 Super Mag with almost the same case volume and the 375 Win with 10 gr H20 more that fits the bill without all the cost of EXPENSIVE custom dies...not to mention all the other already-been-done "Whispers".

Whatever wildcatters think about today, odds are that someone else has already thought of it and maybe even made one...I think about wildcats constantly and have software where I can design just about ANY cartridge/cal...but so far every one I work up /think up has something very near already available. Hahahahahaha


Keep on thinking.
 

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The 358 Gremlin is/was available in single-shots and semi-autos for a while, here in Indiana. That was back when we had the 1.625" regulations on deer cartridges.
 

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Discussion Starter #11

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358/39 is something that I have thaught would be a great little gun .
Maybe take some taper of to get a bit bigger shoulder.
I imagine it being a very cheap to run and versatile gun to carry.
More punch than a 357 magnum available in a range of bolt actions.
Cheers.
 

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358/39 is something that I have thaught would be a great little gun .
Maybe take some taper of to get a bit bigger shoulder.
I imagine it being a very cheap to run and versatile gun to carry.
More punch than a 357 magnum available in a range of bolt actions.
Cheers.
The 358 Gremlin (9x39) was designed to run in an AK or an AR, but is also great in a bolt action. The little CZ527 is one great option for a bolt gun. It is certainly a lot more gun than a 357 Magnum rifle, but less than a 35 Remington. A Model 7 in 35 Remington is a rifle I've been considering for a while now.
 

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Discussion Starter #17
The 358 Gremlin (9x39) was designed to run in an AK or an AR, but is also great in a bolt action.
the russians already have the 9x39mm(.355").:)
9x39mm Soviet | Weaponsystems.net
https://www.sgammo.com/catalog/rifle-ammo-sale/9x39-wolf-ammo

we wildcatted the 358x39mm or the 9.1x39mm(.358), the 358 grendel, 358 gremlin, 358 ARk...to name a few. i was going to rebore a howa mini mauser hvb in 358x39mm, bu ti'm going to do a win m94 in 35/30-30. since i already have the 9.3mm(husky m96 9.3x57) and the .358" caliber, why not try the 375x39mm(ai, i think) OR the 375x33mm(8mm kurz)? the 375 whisper is one too.

all i want to do with the .375" is a close up deer rifle and cast boolits. since i hunt in brush, it will only be 50 yard and less rifle. but i'll say 125-150 yards is the maximum.
 

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the russians already have the 9x39mm(.355").:)
9x39mm Soviet | Weaponsystems.net
https://www.sgammo.com/catalog/rifle-ammo-sale/9x39-wolf-ammo

we wildcatted the 358x39mm or the 9.1x39mm(.358), the 358 grendel, 358 gremlin, 358 ARk...to name a few. i was going to rebore a howa mini mauser hvb in 358x39mm, bu ti'm going to do a win m94 in 35/30-30. since i already have the 9.3mm(husky m96 9.3x57) and the .358" caliber, why not try the 375x39mm(ai, i think) OR the 375x33mm(8mm kurz)? the 375 whisper is one too.

all i want to do with the .375" is a close up deer rifle and cast boolits. since i hunt in brush, it will only be 50 yard and less rifle. but i'll say 125-150 yards is the maximum.
You have reminded me of my dream to have a 358/30-30 .
In a Winchester 94 ae.
I was thinking it would be good to have one chambered in 375 but so cases made from 30-30 are a good fit but the availability of 358 projectiles is alluring.
Cheers.
 

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You have reminded me of my dream to have a 358/30-30 .
In a Winchester 94 ae.
I was thinking it would be good to have one chambered in 375 but so cases made from 30-30 are a good fit but the availability of 358 projectiles is alluring.
Cheers.
The 35/30-30 is among the oldest of smokeless powder wildcat cartridges. It is basically a 35 Remington with a longer neck.

One of the reasons the 375x30-30 or 375x39 isn't such a great option is the lack of bullets designed for the much lower velocities achieved by smaller capacity cases. The few that are available are designed for the 375 Winchester, which means flat-nosed and intended for short range work. To your point, the 35 caliber bullet options are much better, thanks to rounds like the 35 Remington and now the 350 Legend.
 
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Discussion Starter #20
they already came up with the 375/30-30, it is 38-55 win, the parent case of the 30-30.

i agree with you, there's a lack of .375" bullets that achieve much lower velocities. but a .375" cast boolit can achieve that and more. i'm thinking of a 250gr fn gc that is going around 1700-1800fps.

shreck ,
this week or next week, i'll be giving my my m94 in 30-30 to JES. he will make a 35/30-30 out of it. then i'll load a 200gr rcbs fn gc.
Home - Reboring by J E S
 
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