I am fond of the 243AI in a short action if it is throated properly for whatever magazine you go with. A 6x284 is a little crowded in a short action.[/QUOTE]
I do agree, my first AI cartridge was the 243AI, what a great round, when I shot out that bbl I rebarreled & rechambered to 6mmAI & I'm lovin it as well.
IMHO the 6mm-284 is not the best cartridge for a SA platform, a cartrigde of that capacity is better suited to long heavy for caliber bullets (think DTAC, SMK, VLD). These bullet weights are where that particular cartridge really starts to shine; similar performance to it's ballistic twins the 6-06 & the 240 WBY.
For a short action, i'd stick with the 243AI throated to your mag length & save yourself some frusteration..... unless you can deal with a single shooter