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FrankS
.300 member


Reged: 06/10/08
Posts: 108
Loc: New Iberia Louisiana
37 rimmed in a #4 action
      #325674 - 10/03/19 06:58 PM

Some of you were kind enough to dig up a print of the 37 rimmed cartridge for me. Basically it is a 303 British cartridge with the neck expanded to take .375 diameter bullets. In my case I'll be using cast bullets. I do have one question regarding the tabs on the front end of the magazine. Since I will be using a .375 or larger cast bullet what modifications do I make to the tabs. In my experience with the 303 Cartridge when adjusting the tabs too high and they hit the bolt, too low and the cartridge may not feed from the magazine into the chamber. Since some of you have done builds with the 375 2.5" cartridge did you work on the tabs to ensure proper feeding?. Any and all help is greatly appreciated. Thanks, Frank

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Daryl_S
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Reged: 10/08/05
Posts: 18832
Loc: Beautiful British Columbia, Ca...
Re: 37 rimmed in a #4 action [Re: FrankS]
      #325696 - 11/03/19 06:51 AM

Hey Frank - the .375 Rimmed is a worthwile chambering for the #4 or #3, imho.
A slightly more powerful chambering would be the .375 JDJ(IIRC) using the .444 Marlin case.

However, the .375 Rimmed would be fine. When Ken Waters did this chamber on a Ruger #1(or was it a #3Ruger?) he didn't load it very high, pressure wise, as was his usual trait.

Suffice to say, in either of the Enfields, it should do at or over 2,100fps with 270's, about the same power that the 9.5x57 was loaded to, factory wise.

You will have to work on the magazine tabs due to the larger bullet diameter. Converting it to a single stack, with Delrin slabs inside, screwed from the outside, might be an idea. The screws will have to be wood-type screws with beveled heads countersunk into the mag side - V-small dia. would work, I am sure.

I see you are looking at cast bullets. A 300gr. would be super and should get anywhere up to 2,000fps with appropriate loads.

From NOE, the 284gr. and 270gr. looks great.
http://noebulletmolds.com/NV/index.php?cPath=52&osCsid=qj89p0h1of7uqibrtlq9adnvd0

Buffalo Arms also has some nice moulds.
https://www.buffaloarms.com/bullet-moulds/buffalo-arms-bullet-moulds?p=3

On top of those, the RCBS 250gr. is also a good one and shot well for me, in my .375/06IMP & .375 H&H.
http://rcbs.com/Products/Bullet-Casting/Bullet-Moulds/Rifle/Bullet-Mould-37-250-FN-570.aspx


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


"a rifle without hammers, is like a Spaniel without ears" Edward VII


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Ausy
.224 member


Reged: 22/04/18
Posts: 9
Loc: Hindmarsh Island South Austral...
Re: 37 rimmed in a #4 action [Re: FrankS]
      #325825 - 14/03/19 09:45 AM

Hi Frank
I make a single stack insert which fits in a No1 Mk3 SMLE magazine,to take the 375-2 1/2 shell, I realize you are after a conversion for a number 4, but I am sure you could adapt my design to suit,
I still haven't mastered posting pictures on Nitro, but if you are interested send me your email address and I will send you some photos.
cheers
Darryl


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Daryl_S
.577 member


Reged: 10/08/05
Posts: 18832
Loc: Beautiful British Columbia, Ca...
Re: 37 rimmed in a #4 action [Re: Ausy]
      #325844 - 14/03/19 03:00 PM

Darryl - that single stack for the .374-2 1/2" sounds perfect.

Only difference I think, is the magazine latch on the #4.

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


"a rifle without hammers, is like a Spaniel without ears" Edward VII


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Ausy
.224 member


Reged: 22/04/18
Posts: 9
Loc: Hindmarsh Island South Austral...
Re: 37 rimmed in a #4 action [Re: Daryl_S]
      #325849 - 14/03/19 06:30 PM

Hi Daryl
that's right the No4 doesn't have the anti rattle spring like the Mk3 which makes fitting my style
of insert easier, as I have to remove the anti rattle spring on the Mk3, because that is where a small fine threaded slotted screw goes, to hold the insert securely in the magazine, the full size magazine will only hold 5 rounds of 375- 2 1/2, my next project is to make the Lee Speed style of magazine, but in doing so it will limit the rounds probably down to 3.
cheers
Darryl


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FrankS
.300 member


Reged: 06/10/08
Posts: 108
Loc: New Iberia Louisiana
Re: 37 rimmed in a #4 action [Re: Ausy]
      #325960 - 17/03/19 05:49 PM

Daryl.planning to do this in stages. I have a #5 action that came off a jungle carbine. Was in pretty bad shape and pretty banged up. Took the barrel off and with some silicon carbide paper all down to bare metal. What I also need is a proper twist rate for bullets from 250 to 300 grains So if someone can figure out a twist for me I'd be greatfull. Barrel twist I'm guessing should be in 1x16 or 1x18 range. The blank I have in 375 is a 1x14 twist which I think may be too fast. If the #5 action isn't sturdy due to the lightening cuts I'll have to find either a #1mkIII or a #4MKII. I have a Parker hale long branch sporter with a two groove barrel. That one was $200. Sad thing about the tabs is I cannot take the chance bending them cold so I've a small mapp torch with a really small burner tip. Would love to hear from others who have any experiences with 375 cartridges and bending the tabs. I do than all who took the time to respond to my post. Your suggestions and comments are greatly appreciated. Hoping to hear more. Frank

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Sarg
.400 member


Reged: 20/01/07
Posts: 1281
Loc: New Zealand Australia South A...
Re: 37 rimmed in a #4 action [Re: FrankS]
      #325962 - 17/03/19 07:43 PM

I have a couple of Lee Speeds in .375EX 2-1/2in & a couple of barrels coming, I have tried all the magazines & I have told people on here before but all seem to ignore me, the .375Ex & 8mm magazine are the same as a normal .303, other than being shorter & having a follower similar to the SMLE, the .375 works better in the later SMLE magazine when I try them, I just did it right now stuck five .375Ex into a SMLE MKIII mag put that in my Lee Speed .375Ex & loaded them from that mag into the chamber & that was with out bending any mag lips/tabs, I think it could be even better if I did a little adjusting but it worked just fine, as it has many times before !

I load most of my rounds in .303 cases blown straight & long loaded but I had 5 .375Ex rounds to try from the Cartridge Collectors meeting, don't like to do that as it marks them up a bit !

PS I'm sure the No5 action will be up to the job !

--------------------
No poor bastard ever won a war by dying for his country. He won it by making other bastards die for their country.

- General George S. Patton


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Daryl_S
.577 member


Reged: 10/08/05
Posts: 18832
Loc: Beautiful British Columbia, Ca...
Re: 37 rimmed in a #4 action [Re: Sarg]
      #325982 - 18/03/19 05:01 AM

12" twist. 14" might do it as the 9.3x57's were 14" along with a lot of .358's, however 12" would cover all bullet weights and shapes.
Slower, heavier bullets require faster twists than the same bullets going faster.
14" might very well work and most definitely will not be too fast. To err on the faster line is better than to err on the slow side.

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


"a rifle without hammers, is like a Spaniel without ears" Edward VII


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