Not what you are asking about but if it is a single shot a 6-284 is a monster.

I have 3, a re-chambered 243 Montana, a Kreiger 12 twist on a 700, and a Stiller 10 twist Lilja.

They are fast and very accurate.

Necking down 6.5-284 brass in a single pass and Lapua makes brass.

70 grain Blitzkings and BT;s at 3800+ have to be seen to be believed and 100's at 3400 work very well on deer and antelope.
Stiller and my favorite hunting partner.
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Last edited by 6MMWASP; 07/28/15.