Any gunmakers care to comment on the use of 90mm vs 92mm magazine boxes for the 404 Jeffery?

That will depend on the overall length of the loaded rounds. The longer the box the more impact velocity of the follower and the FMJ's on the front of the magazine box. All OEM ammo is crimped into the cannelure groove, so the groove location dictates the OAL

Use 11l17 or 1018 as most do and the deeper the dents will be over time

I let the SAAMI /CIP specs be my guide Reailstically, if you try and accomodate a handloader..Well..just no limit to the length they might want
Agree with Echols...the front magazine wall thicknesss needs consisderation. When I made bottom metal, I went with a 3/16" thikness for the 500 Jeff

I have done both on the ID length of the 404 Jeffery magazine
With the newer spitzer bullets available for the 404 you will need the longer inside length

I use 1018 steel for my 404 guards, and a min of 3 mm wall thickness in the front

J Wisner

quote:

Originally posted by DArcy_Echols_Co:
The longer the box the more impact velocity of the follower and the FMJ's on the front of the magazine box.

This was what made me ask the question.

"Spec" for the box seems to be 92mm. The only factory cartridges I have gotten my hands on are all less than 90mm. So your really just introducing 2mm of free space for your cartridge to accelerate before slamming into the front wall.

This also means the box can be positioned where less material needs to be removed from the bottom lug.

Just thinking aloud.

quote:

Originally posted by J Wisner:
With the newer spitzer bullets available for the 404 you will need the longer inside length

J Wisner

With the CIP spec being 89.6?mm, who makes the new spitzer bullets?

quote:

Originally posted by DArcy_Echols_Co:
Use 11l17 or 1018 as most do and the deeper the dents will be over time

I was considering using 4140, slightly more expensive, marginally longer machining time.

I have the following 404 ammo with bullets crimped in cannelure and measured lengths of;

Kynoch SP 89.3mm
Parker Hale FMJ 89.7mm
RWS FMJ 88.9mm

The RWS rounds are loaded with the original 401gr RWS FMJ bullet, not the later loading using Woodleigh bullets and RWS brass is 72mm in length as opposed to all other 404 brass being 73mm in length.

The magazine box in my stretched standard length Mauser 98 in 404 Jeffery just accommodates the above ammo with hardly any slap room.

All the bullets in the above ammo are seated perfectly to the shoulder neck junction, a sample Barnes 400gr monometal spitzer bullet I have to hand would be seated well into the powder space if loaded to a 90mm OAL.

Posting for D'Arcy:

A 404 Jeffery magazine box is on the right. The back wall is thicker than normal to eat up some of the G series Model 70 3.660 magazine well ID length . The cutout on the right side is to allow the ejector to clear as its a Left Hand receiver. The box is made from 410 Stainless and heat-treated into the mid 40’s on the Rockwell C scale. The magazine holds 4 down and is not a drop box design. A dedicated follower goes with the box. The ID length of this magazine box allows loaded ammo .030 to .045 bullet nose clearance for OAL.

Note the side wall relief cut into the wall on the left side of the box to reduce the friction of the those straight wall cases to roll up the side of the magazine as the rounds are stripped out of the box. If you don’t think that’s important I’d consider another line of work.

quote:

Originally posted by eagle27:
I have the following 404 ammo with bullets crimped in cannelure and measured lengths of;

Kynoch SP 89.3mm
Parker Hale FMJ 89.7mm
RWS FMJ 88.9mm

The RWS rounds are loaded with the original 401gr RWS FMJ bullet, not the later loading using Woodleigh bullets and RWS brass is 72mm in length as opposed to all other 404 brass being 73mm in length.

The magazine box in my stretched standard length Mauser 98 in 404 Jeffery just accommodates the above ammo with hardly any slap room.

All the bullets in the above ammo are seated perfectly to the shoulder neck junction, a sample Barnes 400gr monometal spitzer bullet I have to hand would be seated well into the powder space if loaded to a 90mm OAL.

Appreciate that information!

quote:

Originally posted by BaxterB:
Posting for D'Arcy:

A 404 Jeffery magazine box is on the right. The back wall is thicker than normal to eat up some of the G series Model 70 3.660 magazine well ID length . The cutout on the right side is to allow the ejector to clear as its a Left Hand receiver. The box is made from 410 Stainless and heat-treated into the mid 40’s on the Rockwell C scale. The magazine holds 4 down and is not a drop box design. A dedicated follower goes with the box. The ID length of this magazine box allows loaded ammo .030 to .045 bullet nose clearance for OAL.

Appreciate that info. My current design leaves only a scant .013" from maximum, so I will bump that out slightly.

I was thinking 4140, 35-40 Rc. Salt bath will reduce distortion. Still easily machinable and fileable for any necessary tweaking.

quote:

Originally posted by BaxterB:
Posting for D'Arcy:
Note the side wall relief cut into the wall on the left side of the box to reduce the friction of the those straight wall cases to roll up the side of the magazine as the rounds are stripped out of the box.

I am an adamant believer that just about everything in the Mauser design was put there for a reason. I've been studying this relief cut, and there seems to be a significant variance in the. . . . implementation? Some magazine boxes the relief is minimal, and the case contacts at the front and back of the main body, most do not. There is a significant difference in several different cartridges, that make me wonder what the factors were they used to determine those cuts.

quote:

Originally posted by BaxterB:
I’d consider another line of work.

I frequently do that when laying awake at night pondering my life choices and wondering how I find myself where I am. When other business owners I know are literally making millions selling products with 500-1800% margin that sell instantly and I am selling products with 10-15% margins that take years to sell.