The 284 case would require that you open the bolt face up, I would save that money for my next gun.
Acouple of quick thoughts for you. The larger the bore the faster you can push a bullet of a given weight. Example, With a .22-250 you can push a 69 gn. bullet to abt. 3,200 fps. With a .250 Savage, parent case, you can push a 75 gn. bullet to 3,400 fps. I think you would be better pleased with a .257 imp. than a 6mm on that case. If you`re looking for one that really yells custom, how about a .20- BR. I think they also chamber that one. If you go that way I would recomand that you go with a fast twist for the 50 gn. Bergers. The case head is ok for your bolt face and your case is very over bore for the .20 cal. so you should really have and honest 500 yrds coyote gun.
