In reply to:

---

MBOGO375, I'm up to 67 gr. IMR4350 in my Rigby with the 225 gr. Noslers with no pressure signs whatsoever. Next batch is 69 gr. Just got some Woodleigh 225 gr Weldcores to try as well. Shooting 3" low to the irons at 50 yds.

---

Hi Joe,

I have been meaning to get back to you with my latest results. Last time out I tried 67.0 grains of IMR4350 with the 220 grain Speer FP (CCI250 primers and Bertram brass). I forget the actual chrono readings, but they were around 2525 fps. As you found with your rifle, my rifle also was shooting low (2.25" low at 40 yards, but it grouped less than an inch). I am guessing that it will take 69 or 70 grains to get to factory velocity.

I then tried 65.0 grains of IMR4350 with the Hornady 250 grain bullets. Since the 220's shot low and these would tend to shoot even lower I flipped up the 300 yard leaf before shooting, and it produced a perfectly centered group at 40 yards. Even with my wiggling it still grouped in about 5/8". I did not chronograph this load, but would think that it was in the 2400-2450 range.

The rifle definitely wants to shoot, but needs a bit more powder to get to factory velocity. Hopefully this will bring the groups up a bit without enlarging them. I still have to get some better 225 grain bullets to try, maybe the Nosler Partition. I think that 200 or 210 grain bullets would group close to point of aim, but that would be going in the wrong direction for larger game. I would love to find a load with 250's or heavier that shoots to the sights, but I think that will require a change of the front blade. Lots of options yet, but it promises to be a nice caliber.

Jim

Post Extras