Try a varmint bullet.I have 100g Speer that he wants a load for next. Do you suggest going lighter than this? I'm cleaning the gun and going to put more rounds down range later on.
I had a 25-06 that I couldn’t find a load for until I went with an 87 grain bullet. You might want to see if your rifle shows such a preference. Do a full load work up using a varmint bullet. Also use IMR 4350 or H4350.
You seem to be having an experience similar to mine and as much as I hate to say it wasting time and resources.
Vince