Jamison .45-60 brass chambering in Uberti '76

[Lonesome Charlie]

 Has anyone used Jamison .45-60 brass loads in their Uberti 1876 with 28" barrel and have any comments on chambering pros or cons?
I see that Buffalo A  has it in stock  but it shows a special RCBS shell holder #RCB4060WINSH  instead of the #14 as used for
.45-70.
I have a sample of the Jamison .45-60  and the Rim Dia is .613 and is .055 thick.
Greatly appreciate your comments before I order.


Lonesome Charlie in Colorado country