Recommendations for powder for 243 AI

[Alabama556]

I need some recommendations for powders to use in a 243AI. I am using fed 210m primers, lapua cases, and 90 grain Nosler accubonds.

gun is Winchester model 70 with 23 inch hart barrel and brown Precision stock. Hart trued the action and installed the barrel.the barrel is .675 at the muzzle.

i am not having much luck getting groups less than 1 inch with imr 7828 or 4350.

Thanks for any ideas.

 

[supercorndogs]

I liked 7977 in mine. I think I tried 4831SC too. I don't remember. I know i fireformed with 4000MR, about 42g.

 

[Alabama556]

It looks like r26 gives good results. Can anybody comment on accuracy with r26?

 

[MakeSawdust]

Reloder 26 would seem too slow for 90 grain bullets. I have had good luck with reloder 22 and reloader 17 in a regular .243 with 95 and 85 grain bullets respectively. I have a 243 ai but it is an 8 twist. It shoots the 105 AMAX and 115 DTAC very well on top of H1000. I have not tried any lighter bullets out of it. I might also be tempted to try H4831. With 90 grain bullets.

 

[scatterbrains]

H100v may be pretty good in the Ai i used it exclusively in the 243win with 105gr bullets with excellent results.

 

[Alabama556]

Thanks. I will try the h4831. Is there much difference between h4831 and imr 4831?

 

[Mayday Malone]

Reloder 26 would seem too slow for 90 grain bullets. I have had good luck with reloder 22 and reloader 17 in a regular .243 with 95 and 85 grain bullets respectively. I have a 243 ai but it is an 8 twist. It shoots the 105 AMAX and 115 DTAC very well on top of H1000. I have not tried any lighter bullets out of it. I might also be tempted to try H4831. With 90 grain bullets.

What velocities are you getting from h1000 and what tube size