Jamison Brass Availability

[Hoof Hearted]

Makes ya wonder why all of the folks involved in this "comedy of errors" didn't do the research
Obviously the WRA drawing wasn't too hard to come up with.............

[Hell-Er High Water]

John Boy,

Thanks for the info.  Hopefully your group has Lyman on the right track.

Like I said, if I get a reply from them I'll post their answer.

HHW

[john boy]

Obviously the WRA drawing wasn't too hard to come up with.............

HH ...  Tis True, it's been around since January 1918!

WRC, I suspect, increased their case rim diameter from 056-057 to 057-062 because the toggle links on the original rifles were getting sloppy, generating misfires 

But the story goes like this:  Chaparral did their pre production re-engineering of the 45-75 Winchesters based on Jamison/TenX brass that TenX 'proposed' to make. 

Hobie, I believe, is the only person that has announced that they have received any of the 45-75 TenX loaded ammo, with cases made by Bertram - 4198 powder and Magnus bullets.  Talk about sub-contracting!

Then in some time in mid-stream of production, with the excess head space issue and brass with a 057 rim thickness that generated misfires, they changed to the 1918 WRC cartridge blueprint dimensions (057 to 062).  It's my understanding, though I have not touched one of new cartridges that are being made in Germany, ... it's a clone of the this blueprint with a 062 rim thickness - which is OK with me.  Resized 348's are 062 but with a smaller rim diameter and the 348 shoulders reduces the head space to ZERO!  With 400 rounds through the barrel - not one misfire

Would have been 450 rounds, but our 100-200-300yd match got rained out today 

For what it's worth, just after we received our rifles, 3 of us did a 100yd test shoot using 20grs of 4198 and 23grs of 5744 reloads with the Lee 457-340F bullets.  The XMP5744 groups were winners - hands down

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[Grizzly Adams]

For what it's worth, just after we received our rifles, 3 of us did a 100yd test shoot using 20grs of 4198 and 23grs of 5744 reloads with the Lee 457-340F bullets.  The XMP5744 groups were winners - hands down

John,

Know of anyone who has worked with H4895 in any of these calibers?  Seems like it might be worth trying.

[Hoof Hearted]

John Boy

Like I said, classic "cart before the horse"

Just for grins:

I have a hundred or so reformed 348 to 45-75 cases. These came from Charter and were test fire brass. They will not work in my personal rifle as I have set the headspace to zero using Jamison cases. I will trade these for Jamison rounds to anyone out there that has too much headspace and wants to "tighten" it up that way. Just contact me and we'll work out an equitable trade.

I really like XMP5744 and since there is more case capacity here than in a 45-70 case the starting loads that everyone is working up from (based on 45-70 load data) are low.

[john boy]

Know of anyone who has worked with H4895 in any of these calibers?

Grizzly, Yes.  Swiss Oscar loaded 20.  The groups were OK but not as good as the XMP5744.

Hey, give it a try - your mileage may vary cause Swiss Oscar keeps chiming - 'I'm not a very good rifle shot' as he continues to beat us at our monthly long range matches 

[Grizzly Adams]

Grizzly, Yes.  Swiss Oscar loaded 20.  The groups were OK but not as good as the XMP5744.

Hey, give it a try - your mileage may vary cause Swiss Oscar keeps chiming - 'I'm not a very good rifle shot' as he continues to beat us at our monthly long range matches 

Yah, I've got a buddy like that too!  That's always his alibi!   I think I will try some H4895.

[Crotchety Old Grouch]

I really like XMP5744 and since there is more case capacity here than in a 45-70 case the starting loads that everyone is working up from (based on 45-70 load data) are low.

Hoof Hearted  you may want to check that.  From what I’ve found on differant sites on the internet 45-70 cases hold  between ( depending on the source of the info) 79 to 83.1 gr of water (average 81.05).   My Jamison cases hold 76.1 gr of water, once fired .45-75 formed from 348 WW hold 71.5 and the same WW cases after being fired 6 or more times hole 76.66... gr of water.  So the case capacity of my well used .348 WW/45-75 cases is 94.5% of th average 45-70 case.

Reference 5744 I agree.  My best target load groups to date all use 5744. COG

[Hoof Hearted]

CCG

I don't have time to repeat all the HARD work you have done. Great job, by the way! Although I'm not quite sure what an "average 45-70 case" is. I would think they vary quite a bit also from lot to lot and brand to brand. Also don't forget that the amountof space the base of the respective bullet has effect here. And freebore, case head diameter, bore size, bullet material, lend width, depth, etceteras all affect perceived pressure.

I started with the data from AA for the 45-70 and was able to expand upon it. Your experience may differ

I really hoped I wouldn't need the disclaimer

On another powder matter altogether;
A full case of Swiss fffg cracks like a high power rifle and flattens the crap outta primers, along with deer and hogs...........I know