(01-01-2024, 06:28 PM)icallitmaize Wrote: H4350 is a solid option for the CM and just great to have around as it is good for several popular calibers. I only dialed in one gun chambered in 6.5CM (130gr bullets) but have tinkered quite a bit with 260 Remington. If you aren't too set on the more "temp insensitive" powders, A4064 and IMR3031 are liked by QuickLoad (>90% case fill and ~100% burn) and could run both cartridges. RL16 (temp insensitive) could be efficiently loaded for both but good luck finding it in stock.Powder Valley has Reloder16 in stock, 1# or 8#.
Winchester Staball Match looks like it might be a good fit for both cartriidges, and is one of the new "wonderball" powders that is supposed to be temperature insensitive.