The .284 Winchester is unique; the only 
cartridge in current production of rebated rim 
design.  This means that it's body is wider than 
it's standard .47-inch rim, yielding a case 
(.500) that almost equals the magnums in 
diameter.

    The .284 then, is probably the most powerful 
medium-bore short-action cartridge, where size 
and weight can be important considerations.  This 
may be why the Ultra-Lite Model 20 is ordered 
more often in .284 than any other chambering.

    The .284 also has been the wildcatter's 
dream!  It's 7mm neck has been sized up and down 
the spectrum, with particular favorites at 
6mm/284 and .30/284.  Hodgen Manual No. 26 
considers their.30-06 reloading data applicable 
also to the .30/284, and even lists them together 
in the page title. 

    The .284 was introduced in 1963 for the Model 
88 Lever-Action and Model 100 Semi-automatic 
rifles and carbines, about the same time as the 
7mm Rem. Mag. and .300 Win Mag.  In 1994 
Winchester introduced a Model 70 bolt-action in 
.284.  Browning also offers the A-Bolt in this 
fine caliber.

    The .284 Winchester has excellent ballistics, 
particularly with lighter bullets.