45 Cowboy Special

[Olof]

have you tried the equevent of neck sizing 45 brass to reduce blow back

not sizing all the way down (size only top) only where the bullet is seated

Yes i did. I did not notice any difference. I am going to try annealing the brass. I'll see if that works.
It's not a huge issue, just a little more clean up time, and not much more at that.

 

[dan belisle]

They're referring to powder gases coming back around the case, due to ultra low pressure loads that don't seal the chamber with the with heavier brass cases. I run into it with .455 loads, dirty chambers, powder marks up the sides of the cases. Sounds like these thin neck cases will fix that.

That's what I thought, but I've always heard it called blow by. Thx. - dan

 

[dan belisle]

I've been thinking of the 45 Cowboy Special (and keep in mind I haven't actually seen one). Isn't it sort of a thin rimmed 45 AR? Kind of reinventing the wheel, I think. Unless you need the thinner rim for the lever guns. - dan

 

[Ardent]

More of a thick rimmed .455, as the case is so thin, in fact it's just a thick rimmed .455 Mark I from what I understand...? I think the blow back term has something to do with cases setting back against the face of a revolver frame under ultra low pressure loads as well, which can cause binding. Also just due to the case not stretching out to the chamber walls tight enough.

 

[Olof]

More of a thick rimmed .455, as the case is so thin, in fact it's just a thick rimmed .455 Mark I from what I understand...? I think the blow back term has something to do with cases setting back against the face of a revolver frame under ultra low pressure loads as well, which can cause binding. Also just due to the case not stretching out to the chamber walls tight enough.

I Think you nailed it!