TMR
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Brass isn't any more expensive, its just standard 243 brass. It does need to be fireformed though. Dies are slightly more expensive, but not much. One of my tactical match rifles in in 243AI and has become my main rifle. The gain in performance over a straight 243 is hard to overlook. Basically around 200-250fps+ seems to be the normal. 105's 3250-3300, 115's 3190-3250 out of 26-27" barrels. My match rifle runs 115 dtacs at 3240 fps out of a 27" barrel. Hits hard and cheats wind pretty good. I really don't loose much brass over the course of a year...50-75pcs at the most. Cases last 5-7 firings and I start over. My process is buy 500 cases, form them in a fireform barrel, then shoot. Barrels last around 1500-2000 rounds, so the brass is used through the life of 2 barrels really. A straight 243 is also a great round and can be push the heavy 6mm bullets to where they work well. The AI just gives it a little more push is all.