Originally Posted by rosco1
Pretty sure his Allen Xpress line are Lapua improved, The allen Mags down to the 338AM are cheytac improved(505 gibbs)


Yer right!

There is one exception that I was thinking of and that's Kirby's Raptor line and specifically the 338 Raptor. The 338 Raptor is, to me, a very promising chambering as it rests between his own 338 Allen Xpress/the 338 RUM/338 Edge(and +P variant)/the 338 Lapua(and AI variant) and the HUGE 338 Allen Magnum.

http://www.longrangehunting.com/forums/f19/allen-precision-338-raptor-update-93203/

which is based on the 338 Excalibur (which is/was "an entirely new case") designed, I think, by Jamieson Int'l.

http://www.broadswordgroup.com/338_excalibur.html

and *not* off the 404 Jeffries. My error.