Kirby is correct, I have the original .416 Rigby (elephant rifle) chambering, and the case is .176" longer than the Lapua case. I have 200 pieces of Norma brass that I have been loading to MAX loads according to the Barnes manual with no pressure signs at all (soft Federal 215M primers too!). I was shooting the 325gr. X bullets at 2875fps with 110grs. of RL-22 (25" barrel), however Barnes has discontinued the 325gr. [img]/ubbthreads/images/graemlins/frown.gif[/img]
Now, what I am actually considering is to take the new TSX in 400gr.
and actually cut a nice boat-tail on the base of each of them. They'll probably wind up weighing 370grs. or so, but the BC will be much higher than the factory flat based TSX's BC of .546. Now, I just need a computer program to compute the new BC # for the improved shape, for some good drop charts.......and the Ivey Rings.
JFYI, I have heard that the NEW .416 Rigby Brass offered by Jamison International Brass is redesigned to the same pressure limits as the .338 Lapua.
I heard that from the Accurate Reloading Forums
---more specifically, "RIP" who has visited Mark Jamison's place and had some good talks with him. I may need to try some of those if I notice my Norma's primer pockets getting loose. [img]/ubbthreads/images/graemlins/cool.gif[/img]