The .284 was designed to have a fatter body but a rebated rim that would fit .308 sized bolt heads. To use it in a short action those long bullets would have to be seated deep in the case using up space for powder. The .284 has a short neck to give the case more powder and use with 140 gr bullets. Your best bet is to go with a true long action. Avoid those long actions made to shoot short action cartridges as the conversion is a real pain, been there, done that. Tweeking a magazine may be the only problem. Stand by for more people to jump in on this one. Also, check the ballistics of the 7mm-08 and the old 7x57 mauser. The 7 mauser is a great old 7mm cartridge and may fit into what you want for ballistics. The relaoding manuals are all written for use in old mausers and wont show its true poetential, plus it can be made into a rifle with only a barrel change. Mine is 24 inches and works well with 160 gr. bullets. Goods luck with your choices. If you are going to shoot those long bullets make sure you get a barrel with a fast enough twist to stabilize them properly. If you want really high velocities you will have to start looming in the recent reloading amnuals for something. I am sure a lot of recommendations will follow mine.
El Lobo
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