Good luck with the 869. I understand it is very close in burn rate to H870.
I tried to use H870 in my 26 inch Winchester barrel. But it was too slow to make decent velocity in my barrel. Even when I passed the maximum recommended charge weight by several grains, I could not get over 3100 fps.
I just found some notes from May 2006 using Magnum and a CCI 250 primer with the Sierra 140 gr spitzer boat tail in a 26 inch barrel.
65.0 gr --2858 fps
66.0 gr --2898 fps
67.0 gr --2951 fps
68.0 gr --2991 fps
69.5 gr --3043 fps
70.0 gr --3038 fps
70.5 gr --3080 fps
71.0 gr --3150 fps
71.5 gr --3087 fps
72.0 gr --3155 fps
72.5 gr --3133 fps
73.0 gr --3188, 3153, 3133 fps
ETA: In reviewing the earlier posts, I see that my loads are significantly over those listed as maximum. This barrel always required over maximum charges to make velocity.
In 2006 we were pretty much flying by the seat of our pants with any of the new powders in the 264. There was very little published data available.
