Which powder for 6mm AI and 87-105 grain bullets?

[Tyler Kemp]

I have tried IMR 7828 with 105 grain Amaxes, and they aren't grouping real well, and I thought maybe they weren't stabilizing because of the speed. Which powder can I use for 87-105 grain bullets and get maximum velocity to hopefully tighten things up with the heavier bullets?

 

[Derek M.]

4350 or 4831, either Hodgdon or IMR
Re19 or 22

I think you'll best results with 4831 with 105 bullet.

 

[Fiftydriver]

I would agree, Rl-19 with the lighter bullets, Rl-22 with the heavier.

H-4350 for the lighter and H-4831 for the heavier. You may want to try the SC version of 4831 as well, better load densities.

7828 is pretty slow for this round, even with the heavy bullets. I have found Rl-22 to be about perfect in the 6-284 with 105 gr bullets and its slighly larger then the round your dealing with. A bit faster burning powder should help things.

Kirby Allen(50)

 

[Ernie]

I would use H-4831sc for the heavier bullets.
It is what I use in my 6-284 for the heavier bullets.

 

[Tyler Kemp]

I think I'm going to try RL 19 next. I had some RL-22 left, but only enough for about 40 rounds. Drop charts seemed good when I entered 3100 fps as the velocity, although I had a soft brass issue. Maybe RL 19 can get me 3200 fps without pressure signs and better accuracy.

Has anyone tried those Vihtavouri(sp?) powders that claim a big increase in velocity? Any drawbacks to this? 3300 fps would be mighty flat shooting with a 105 grainer, or 3400 with a 95.