@Denny Gibson
I load .308 to Service Rifle levels for my M1 Garand (converted to .308) and my Ruger SFAR.
I use the Hodgdon Reloading site and I scroll to “
.308 Winchester Service Rifle”
Here is a screenshot of a load screen for a 150 grain projectile and H4895 powder.
View attachment 1203320
That screenshot is from here:
hodgdonreloading.com
I don’t know if this helps, but this is where I get my service rifle load info. As you can see the staring recommended charge is only about 3% below maximum. I definitely wouldn’t be comfortable shooting a 20% or 40% reduction in powder charge with a gun designed for that min-max pressure window. But that’s just me.