Re: 338/375 Ruger?
I'm in the early stages of testing a 338/375 Ruger. Weapon is an unmodified Sendero in 300WM rebarreled with a 27 inch, 1-9.0 twist, 1.250-.825 taper Satern barrel.
Here is a current list of data fired, I'll update every few days as I shoot.
All initial 225 Accubond loads use 215M primers and OAL set at 3.510 to use magazine.
nosler 225 accubond
RL-22, 85.5gr, 3146 fps (close to max in my weapon)
IMR 7828, 83.5gr, 3067 fps (low pressure compared to RL22 load)
H4831SC, 82.5gr, 3021 fps (primers slightly flat)
Still have Hybrid100V and few others to test.
300 sierra matchking OAL changed to 3.650, still 215M primer
IMR 7828, 75.0gr, 2623 fps (initial 300 gr load, would like to make 2700 fps before overpressure)
I've used BR-2 primers with similar charges under 90gr in similar cases so I'll try those next along with 250 AB's and MK's.