you ought to find something in here that will suit your needs...

https://stevespages.com/264_12_120.html

That is for the 120 grain bullet weight. If you are trying to keep recoil down... use the 3031, RL 7 or IMR 4198 load data...

These are for a regular 260, but the AI only adds a couple of grains more if you want it.

I've been shooting the 260 since 1998 when it came out.

"Minus the killings, Washington has one of the lowest crime rates in the Country" Marion Barry, Mayor of Wash DC

“Owning guns is not a right. If it were a right, it would be in the Constitution.” ~Alexandria Ocasio Cortez