I don't have details on powder charges and MV. My opinion is there won't be much difference between the 37* shoulder Rogue and the other 40* shoulder improved versions of the 338 Lapua, or the Allen Express. To the point I've been collecting others' load data in 338 LAI 40-degree designs as a roadmap for my own load development. The 338 Lapua case can only be blown out so far, to a minimum body taper that still allows for reliable extraction of fired cases from the rifle chamber. I could have pushed that to the very maximum and gained a bit more internal case volume.
Reliable/functional body taper and shoulder angle were both considered because I will hunt brown bear with this rifle on Kodiak Island. Reliable cartridge feeding from the magazine, and reliable fired case extraction were both prioritized over and above obtaining an additional 25 fps MV. The case is still a very substantially "improved". The 37* shoulder angle is less common than 40* 338 LAI shoulders - I think. I could have gone either way on that. The 37* shoulder may chamber from the magazine a little less fussy than a 40* shoulder, but I doubt a guy would ever notice the difference in function. I'll try to post a copy of my chamber reamer specifications this evening.
I don't intend to engage brown bear from 20yds, but this improved version of the 338 Lapua was selected to enhance reliability in cartridge feed and case extraction. I'll be confirming reliability on both counts prior to carrying the rifle on Kodiak bear hunts.
Reliable/functional body taper and shoulder angle were both considered because I will hunt brown bear with this rifle on Kodiak Island. Reliable cartridge feeding from the magazine, and reliable fired case extraction were both prioritized over and above obtaining an additional 25 fps MV. The case is still a very substantially "improved". The 37* shoulder angle is less common than 40* 338 LAI shoulders - I think. I could have gone either way on that. The 37* shoulder may chamber from the magazine a little less fussy than a 40* shoulder, but I doubt a guy would ever notice the difference in function. I'll try to post a copy of my chamber reamer specifications this evening.
I don't intend to engage brown bear from 20yds, but this improved version of the 338 Lapua was selected to enhance reliability in cartridge feed and case extraction. I'll be confirming reliability on both counts prior to carrying the rifle on Kodiak bear hunts.