Dear RayG, This may be a little late, but I have been occupied and not on the site very much. I have two loads that are capable of 1" groups from my Ross
model of 1910. I sometimes shoot a flyer, but I call it when I do.
The first is 46 gr. of H 380, 150 gr. Sierra FB Spitzer, Federal primers when I can get them, otherwise Winchester. Your C.O.L. will depend on your rifle.
The second is even better by a little bit. 40.7 gr. IMR 4064, 180 gr. Sierra Spitzer (flat base) same primers, my C.O.L. is 3.125", yours may be different.
I think it is worth it to buy a neck sizer die and a Lee crimping die - I seat my bullets WAY out, and the crimping die gives them some bullet pull with a light crimp. Also keeps them from getting knocked out. The neck die should solve your problem. I separate all cases for all my different guns and they last a long time that way.
Hope this is helpful,
Kari