I had a very nice spring day at the 100 yard range today with my Howa .375 Ruger SS 24" (laminated "ioni" stock). The stock is still unfinished since I was in a hurry to start developing loads.
Having tested the 250 gr Sierra SBT for speed and pressure with two powders, I concentrated on a few loads in search of accuracy. 75 gr Vihtahousu (Vihtavuori!) N550, Federal 215, COL 3.386 in gave me an average V5 yd of just over 2600 fps and a nice lucky group. This load will do for practising running target (moose, 82 and 110 yd). Bullet diameter has already been subtracted from the reading by zeroing the calibre with a bullet.
I also tested the 260 gr Nosler Accubond for speed and pressure. 71-80 gr N550 at one grain increments gave V5's of 2464-2818 fps. The fastest load was a little hot. There was no stiffness in the bolt but the plunger hole left a clear mark on the case. But no worries, I only need c. 2600 fps for moose. I'm sure there is an accuracy window somewhere around the desired muzzle velocity.
I have to say that after just less than a hundred rounds I’m already a fan of this caliber! It’s nice to shoot and I’ve heard that .375 is great for large Finnish game. The 1” Limbsaver recoil pad really helps the shooter by absorbing the sharpness of the recoil. This rifle will be with me for a long time.