Re: 6.5 wsm reloading data
For 140 gr Bullets, I have settled on 66.5gr of Retumbo. I have used Wolf Magnum, CCI 250 and Federal 215M primers in order of hotness. With CCI 250s I am right at 3200 instrumental from a 28 inch barrel. Let me know if you see some Retumbo for sale.
I also like 67.8 gr of VihtaVuori N-570 (SD is very low) for about the same speed.
I use between 67 and 68 gr of Retumbo with 130 Accubonds and 129 Hornadys for 3300 or over fps.
When Hodgdon H-1000 came out, I called and talked to Bruce Hodgdon about H-1000 in the .264 Winchester Magnum. I had two Model 70s with 26 inch barrels in that caliber, one was a custom barrel the other factory. Neither Bruce or I got 3200 fps out of our attempts with H-1000 with 140 gr bullets. We got close but not quite. We were using up to 70 gr of H-1000 and never got there.
H-1000 is the same powder as Retumbo but with less retardant. I just ran several groups of H-1000 with Wolf mild Magnum primers up to 62.7 gr for 3030 fps shooting 140 MatchKings. I tried 62.85 (my scale reads to the hundredth grain) but ended up pulling the bullets (3050fps) That was from my 28 inch Krieger barrel. (I also have a 6.5 WSM with a 26 inch Rock Creek 5R barrel.