Mark, I am very appreciative of the information you have shared, thank you.
Bill
Considering the lite2mid weight4cal rounds that I am currently "working" with, it appears that maybe I should try 17 (I already do have 19, 22, 25, & 33). It looks like a definite try for ther 7RM, but is there a chance that it could work good in the 7RUM, with 140 grainers?
I will mention that I have seen more than one person get very good results with 17 in the 375 Ruger. Large case volume, about same as the Dakotas, but very "under" bore.