I have finished my new wildcat 338-375 ruger (Demon). I am wondering if anyone has some good loads they have worked up for thiers. The two I have found that work well are:
CCI mag primer. 93 gr. Vihta Vuori N570. 250gr hornady hpbt. 3120 fps.
CCI mag primer. 90 gr. MRP2. 250gr. hornady hpbt. 3050 fps.
Either way its got the Lapua with the same grain of bullet in a factory load beat.
The shoulder is not improved. I have had trouble bulging the cases with 90-93 grs. Of n570. I'm thinking of switching to n560 or reaming the throat a bit to seat out a bit. Should fix the problems. But using a smaller case and decimating the 338 lapua mag, Priceless
Use data from a 340 wby, that's what your duplicating, I want to see your 338x375ruger push a 300 grain berger at 2900fps, a lapua will! Anyway you have virtually the same capacity as the 340wby and the same pressure rating.
If the Lapua mag with its giant and ineficient case can be bested bye a case with ten percent less case cap. Lapua mag hot loaded is about 2975 with a 250 gr. bullet the 338/375 Ruger Demon is pushing it to 3130. If I drop to Vihta Vouri N560 or ream the throat out for a longer seat out I could push 3225-3250. Thats impressive. Don't get me Wrong the Lapua mag is impressive. But it was built in the 1980's and the case was not as efficient as modern cases. I wish Lapua would update it. As they are one of the finest in new caliber creations.
As I said, load them both with 300 grain pills an see which one is more impressive, the lapua isn't bad for a 29 year old cartridge. Use either one of them and try to catch ole roys 338x378 from the 50s!
As I said compare case capacity and just the fun of making a wildcat its amazing. Also as I said I wish Lapua would make a new 338 cartridge. As they did with the 6.5x47 which compares with the 300 Win mag. Then I believe I would have a rifle that would compare to my Cheytac. Maybe not. Either way there is alot of potential for the 338 caliber as a whole without having to go to barrel eating over bore.