Search:

Yes, a larger diameter neck may offer a possible work-around if you are prepared to arrange your sizing gear to partially size the necks. This has often been discussed on here but perhaps is not...

Some related snippets of information on the .284 Winchester

From time to time I see mention of .284 reamers that are supposedly ground to cut chambers specifically for use with necked-up 6.5-.284...

150gr@2900 ft/sec from a 7mm-08 with anything less than a flagpole for a barrel sounds a bit like this. :(
The 11gr more water capacity in the .284Win has got to count for something.

From my online searching on this 284win-specific topic (embarrassingly extensive) the anecdotal reports were for an effect on accuracy rather than early pressure signs. < 0.003" ( 1.5 thou each...

Further to my earlier post, I've since cross-checked several dimensions on the Manson and JGS regular SAAMI reamer drawings.
The neck diameter runs from 0.323" to 322". Necked up but unturned...

Recently I plugged in some numbers to see what difference QuickLOAD calculated in muzzle velocities between the .280AI and the .284Win, as I'm also thinking of making a change, from the one to the...