Shotgun, I know someone who could build any of the guns just recomended.The case of either 6.5 or 6 284 will be the same,and in same bullet weight vel will be the same,or close,in same bullet weight the 6mm will be longer , and there for better balistics. But, the 6.5 allows you to shoot heavier bullets.
------------------
www.varminthunters.com/shooters