Thanks for sharing. I'd be interested in learning:
1. How much freebore/throat this rifle was chambered with.
2. The water case capacity of the fired cases.
3. Maybe you have a picture of the case as compared to a standard 338-378 Wby case you could post...or email it to me, and I'll post it.
4. Same interest as posted above on the accuracy at these velocity levels
I was able to achieve 3100+ fps before pressure signs with the rifle listed below:
Weatherby Mark V
338 Excalibur w/.285 worth of freebore/parallel throat
31.25" Brux 9.8 twist
COAL was approx 4.185
(I'll get a more recent pic with the optics mounted and some more load development here a few weeks)
Accuracy came in around 122 grains of H50BMG at 3075-3082 fps with the 300 SMK.
The once fired cases hold right at 140 grains of water with a spent primer seated in reverse.
This case/bullet COAL combination starts to see powder compression at the 123.5 to 124 grain levels....with a 140 grain case and a long COAL.......this 338-378 Wby must be absolutely maxed out regarding case improvement...and have a bunch of freebore to boot.
Thank you very much for sharing, and am interested in hearing more about this rifle.
L-R....338 Norma, 338 Lapua, 300 RUM, 338-378 Wby, 338 Excalibur, .540 bolt face/staggered feed Wby mag box, .580 bolt face/center feed Wby mag box.