Lee sells something they call the Universal decapping die for about $10. I keep one on my bench for just this kinda stuff. Never done 45-110, but I have loaded an awful lot of stuff using some other die to neck size with and it should work.
For the time being, you can just knock primers out any way you can and go from there. Back your .45-70 dies out by the difference of the length in the two cases and have at it.
