Wouldn't do that if I were you. For same bullet weight and powder type, necking down to smaller caliber will give you higher pressure for the same amount of powder--smaller hole for the gas to escape from and longer bearing surface on the bullet.
Hodgdon has 6-284 data on their site:
http://data.hodgdon.com/main_menu.asp
(FYI, according to their annual manual, these 6-284 loads are for reformed Win cases, WLR primers, and a 26" barrel)
As an example of my first comment, note that they give 51 gr of H4831 for a 107gr bullet as the starting load for a 6.5-284, but this is the MAX load for the 6-284.
Bookmarks