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Shooting & Reloading - Mausers, Big Bores and others >> Big Bore Rifles
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Evan
.224 member


Reged: 19/12/21
Posts: 40
Loc: British Columbia
500 Jeffery P14 build
      #393504 - 22/09/25 06:33 AM

I've been working a 500 Jeffery build for a new years now on and off. i thought i had it done once already but then decided to change it up a bit the more i shot it.

the first time it was finished it had a mill surplus cut down stock and a 2 round single stack mag. the more i looked at it the less i liked the p14 stock and the fact it has a huge floor plate for such a small round count bugged me too.

so now the rifle has a bigger mag box and will hold 4 in the mag with 1 in the chamber and its in the process of being put in to a walnut sporter stock.

the barrel is 18.5" long and it weighted 8 pounds before i started switching the stock. it very well could weight closer to 8.5 pounds when done.

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Evan
.224 member


Reged: 19/12/21
Posts: 40
Loc: British Columbia
Re: 500 Jeffery P14 build [Re: Evan]
      #393505 - 22/09/25 06:37 AM

















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Evan
.224 member


Reged: 19/12/21
Posts: 40
Loc: British Columbia
Re: 500 Jeffery P14 build [Re: Evan]
      #393506 - 22/09/25 06:39 AM











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93x64mm
.416 member


Reged: 07/12/11
Posts: 4532
Loc: Nth QLD Australia
Re: 500 Jeffery P14 build [Re: Evan]
      #393507 - 22/09/25 10:33 AM

Evan,
to base your rifle on a P14 you've picked a winner as in reliability & simplicity of action, field stripping etc, a LOT of work still to be done though!
Have you milled the action to hold both sides of the Jeffery round without it popping up as it sits on the follower; & hence only reloading from the bottom?
The new mag well is HUGE, but to get 4 in there is a real feat in itself!
Your follower I guess could be then be conventionally shaped to allow for the staggered stack - just much larger?
As for an 18" barrel & 8 1/2 lbs, you are one brave & tough sod, that'd kick the snot out of me!
Imaging the muzzle flash just on dusk - that would be epic!

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Rule303
.450 member


Reged: 05/07/09
Posts: 5309
Loc: Woodford Qld
Re: 500 Jeffery P14 build [Re: 93x64mm]
      #393508 - 22/09/25 11:29 AM

Evan, I like your choice of actions, I really like the P14/M17 Actions. Getting 4 down of those rounds in the mag although doable is not any easy task. Well done. I agree with 9.3X64 in that it would be well past my recoil tolerance. It tops out at 450grain projectiles in the 416Rigby, way below yours
Looking forward to the range report.

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DarylS
.700 member


Reged: 10/08/05
Posts: 27865
Loc: Beautiful British Columbia, Ca...
Re: 500 Jeffery P14 build [Re: Rule303]
      #393509 - 22/09/25 11:46 AM

8 1/2 pounds - yes, for sure, YIKES!
Good stuff, Evan, brave Cobber that you are.
With the current torn rotator cuff, I'll pass on the .416, thanks.

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


"a gun without hammers is like a Spaniel without ears" King George V

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Evan
.224 member


Reged: 19/12/21
Posts: 40
Loc: British Columbia
Re: 500 Jeffery P14 build [Re: DarylS]
      #393510 - 22/09/25 12:46 PM

the rifle at one point was finished. it had crappy sights, (think base model single shot 22 rimfire) and it just didn't feel like i wanted it too. but its functioned and i fired a few hundred rounds thought it.

the recoil isn't that bad, although i would only shoot it free hand and standing. on a bench this would hurt quite a bit. I'm a lighter guy so the rifle just moved me out of the way.

i did machine the feed rails to work as a single stack mag. i can load form the bottom or i can load from the top as if i was loading a single stack mag. i added a video of loading it when its was a 2+1. now that it is a 4 +1 it ca be loaded the same way. if i need more then 5 shots i have bigger issues lol. the follower is a modified 3006 follower.. it takes a lot of room to fit 4 in the mag.

i also added a little video of me shooting it after i function tested with a string (march 2022). i didn't have the sights on it it yet and i was just trying to test function/ and get a feel for it.

when it was first assembled i fired it with oiled cases via a string, to check for issues and to make sure the stock would hold up.









https://youtube.com/shorts/q1Q2Xzq3OrE?feature=shared


https://youtube.com/shorts/v-cXiD2FmSQ?feature=shared



Edited by Evan (22/09/25 02:52 PM)

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Marrakai
.416 member


Reged: 09/01/03
Posts: 3789
Loc: Darwin, Top End of Australia
Re: 500 Jeffery P14 build [Re: DarylS]
      #393511 - 22/09/25 12:46 PM

Yes, way too light for me too!

A fast second shot on DG, perhaps not often needed with this chambering (!! ), would be out of the question!

Ten minimum, eleven better!

...but happily awaiting range report.

--------------------
Marrakai
When the bull drops, the bullshit stops!
--------------------------------
www.marrakai-adventure.com.au

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Evan
.224 member


Reged: 19/12/21
Posts: 40
Loc: British Columbia
Re: 500 Jeffery P14 build [Re: Marrakai]
      #393512 - 22/09/25 01:04 PM

just to be clear on the intent of this rifle. its not what i would have wanted if i redid this today.

when i built it i was just finishing up a 460 Weatherby and the Canadian government banned rifles above 10k J. so i lost the legal status Weatherby after shooting maybe 40 rounds out of it

so i wanted to build a huge boomer, ultra utilitarian rifle, used as a club as often as a rifle, carry into the bush anywhere and have enough power to roll anything come across. at the same time in my life i was planning a move to British Columbia from NS. so i figured any hikes and camping id be doing not in hunting season this would be the rifle.

i figured way more carrying and basically no shooting. but now ive lived in BC for 4 years and been camping over 100 nights and got a few mountain goats and many black tailed deer. i no longer feel i need such a rifle lol. but i started the project and i want to finish it.


if i was to do it over again i would go for 10 pounds even, 26" barrel and walnut stock from the get go.

but i have this 18" barrel and a receiver that holds 4+1 rounds so ill make the best of it. i don't care about the weight, the rifle will never leave Canada and is for pure enjoyment while carrying it

but yes a range report, im excited for that too

there are 2 lengths of round i load for this rifle, i load the 450gr and 520gr to 84mm(3.300") and the 550, 570, and 600gr at 88mm(3.460")

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93x64mm
.416 member


Reged: 07/12/11
Posts: 4532
Loc: Nth QLD Australia
Re: 500 Jeffery P14 build [Re: Evan]
      #393513 - 22/09/25 09:20 PM

Man that it some SERIOUS recoil!
If the 460 Weatherby exceeds 10k J, then the 500 Jeffery must sail awful close to the magical figure?

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Rule303
.450 member


Reged: 05/07/09
Posts: 5309
Loc: Woodford Qld
Re: 500 Jeffery P14 build [Re: 93x64mm]
      #393518 - 23/09/25 07:22 AM

Just watching you fire this rifle has me wanting to try it, but with a recoil pad. Yeah, I know, I take leave of my senses now and again Thankfully I am in Aussie so no chance of that happening



I like your reasoning behind the project and I don't think any bear would want to argue with you after being hit in the boiler room by a 500J.

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Evan
.224 member


Reged: 19/12/21
Posts: 40
Loc: British Columbia
Re: 500 Jeffery P14 build [Re: 93x64mm]
      #393519 - 23/09/25 01:51 PM

Quote:

Man that it some SERIOUS recoil!
If the 460 Weatherby exceeds 10k J, then the 500 Jeffery must sail awful close to the magical figure?



The Canadian government seemed to have went with the original factory load when determining the energy.

if the 500 Jeffery was loaded to the 460 Weatherby pressures it would easily break 10k jewels. so they ended up going with the original load and not the theoretical max possible pressure.

lucky for me the 500 Jeffery original load was 535gr bullet at 2400fps. that's 9,200j so its under the 10k limit

the only reason for the limit is they wanted to ban the 50 bmg / 14.5 x 114 up into the 20mm x 102 vulcan rounds. the 460w and a few of the other big bores got caught up in to it


Rule303, that is kind of where I'm at in the thinking, even a charging grizzly would think about a second charge if it was hit with a 500j.

Edited by Evan (23/09/25 01:54 PM)

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lancaster
.470 member


Reged: 06/05/08
Posts: 9638
Loc: There's a lighthouse in the mi...
Re: 500 Jeffery P14 build [Re: Evan]
      #393522 - 24/09/25 12:45 AM

with the short barrel would a muzzle brake not be a good idea?

--------------------
Norwegian hunter misses moose, shoots man on toilet
.
bringing civilisation to the barbarians

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DarylS
.700 member


Reged: 10/08/05
Posts: 27865
Loc: Beautiful British Columbia, Ca...
Re: 500 Jeffery P14 build [Re: lancaster]
      #393523 - 24/09/25 08:48 AM

Muzzle breaks tame down a high muzzleblast more than straight power induced recoil, I think, however it might be a good idea.
"OLD John" (Buhmiller) liked them on his big guns.

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


"a gun without hammers is like a Spaniel without ears" King George V

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MiBruce
.224 member


Reged: 01/02/14
Posts: 13
Loc: Michigan, USA
Re: 500 Jeffery P14 build [Re: DarylS]
      #393534 - 29/09/25 10:28 PM

I'm curious what the dimensions are of the magazine feed rails that you ended up with to get it to feed right. I've got a potential project to put a 500 Jeffery on a Mauser action and figuring out the feeding of the round is the biggest worry I have. Did you have any issues with getting it to feed properly?
Thanks,
Bruce

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