Originally Posted By: cdatdogOkay, those of us who have the Plain Jane 243. And those that have a 243AI. Who's happier? With the cost to re-barrel, fire form your cases, just to gain maybe a 100' FPS. Is it really worth the cost? For all the invested monies to have an AI. Wouldn't it be easier just to get another "Plain Jane" in 22-250...
I think it all depends on how much velocity you want in a 6mm rifle. The 22-250 is fine, it's just not a 6mm. It's good to own a 22-250, but let's talk 6mm which you asked about.
The two guys who posted here have the two VERY best 6mm's for velocity.
If I were you, looking strictly at 6mm's, I search the ballistics of both cartridges mentioned, and make your own decision.
I have a standard 284 and LOVE that case. I compared ballistics of the standard 280 Rem, and the 284, and decided on the 284 because of it's short, fat case, compared to the long 30-06 case necked down to make the 280 Rem.