40-400-SP-CSA

[Mike]

Mike,yes that's the only way I can get a greaser to seat in this chamber.

Hey Don, We should have the same chambers in our guns, cut with the same reamers, so I'll try loading some of the 68 grain charges today. Shoot sharp, Mike

[Don McDowell]

My rifle really liked that load with the RCBS. Have a bunch loaded with the Saeco 740 ready to test when the weather decides to cooperate.

[Mike]

Yes, the weather here isn't that friendly either. Not as cold as in your backyard but we've got rain. And just a couple of hundred feet above us it is snow, with I-90 closed in both directions over Snoqualmie Pass due to avalanche warnings. That makes us wonder why the DOT removed the snowsheds. Shoot sharp, Mike

[Don McDowell]

Worst part is the wind. Dang stuff just won't give it up..

[Mike]

And, to get back to the .40/70 SS, do you know of much difference between Hornady brass and the new Jamison brass? Shoot sharp, Mike

[Don McDowell]

No not right off , but with a bit of time I can try and determine it. I have a goodly amount of both in brand new unfired condition.

[Mike]

I have both too and maybe in just a little while I'll let you know if one holds more than the other. I'll be loading with the Hornady brass, shortened .405s. Shoot sharp, Mike

[Mike]

Hey Ranch, My first "supposal" is that the Hornady brass holds a bit more powder, however, that is said with recognition of all things not being equal. What I mean is; my Hornady .40/70 SS brass (shortened from .405 Winchester) are fire-formed and my Jamison brass is brand new. Once I get some fire formed Jamison brass, I do believe the cases will have basically the same capacity. Compressing the 68 grains of powder in the Hornady case was easy while in the unfired Jamison case a bit more effort was required. This was done just as a "try it and see" while my shooting will be done for now with the Hornady brass. Shoot sharp, Mike

[bruce moulds]

it would be interesting to compare neck thicknesses of cut down hornady and headstamped Jamison brass.
using straight 405 brass as is I have found the necks a bit thick form about 0.4 down from the top, and required some thinning.
keep safe,
bruce.

[Mike]

Bruce, I've had no trouble with the Hornady brass. After annealing some of the cases did stretch but that was taken care of. And I might try to compare the thickness of the Hornady and Jamison cases after firing them both with the load Don recommended. That won't happen for a couple of more days. And for the time being, I'll stay with the Hornady brass for use in my CSA Highwall. Shoot sharp, Mike