Does this .001" make much difference in accuracy? life of the brass?

I'venarrowed by choice down toeither the Hornady XTP or the Speer Gold Dot for hunting with my S&W 629 44 mag. The basic difference between the two is this .001". Since I'll be using open sights, I'll probably never be able shoot both and come up with a clear winner. But has anybody with a scoped revolver tried bullets that were both diameters and seen anything decisive.


Thanks
Dan