Re: replacement for H870 in 264 Win
I agree, go with retumbo, and i do believe H870 is available as T870 from thunderbird....
Strongly recommend you leave US869 alone, very high energy density, but very spike-y once you get to top end loads. Got great velocities in 6.5-300 win mag (Voodoo) but it just wasn't worth the sensitivity of the load.
"Out of range" is a theoretical concept as far as I'm concerned. Send it!