LAST EDITED ON Aug-22-17 AT 09:49 AM (MST)
I have only used the 26 for the 200gr. and it shot great.
I'm just not using any bullet heavier than 180s in my .300 right now. But it is a slower burn rate and would likely work fine with 180gr. also.
I happen to have lots of R-22 so won't be using anything else anytime soon.
Barrels shorter than 26" on the .300 may need a faster burn rate than the R-26 has.
I have a 26" barrel on my model 70.
Of the bullets you listed, that Accubond should be extremely similar to what the characteristics of the ELD bullets are. Both in flight, terminal performance, and pressure.
Seating depth is where tweaking might be needed.
I have polished the resizing expander ball of the die to allow more grip pressure on the neck also.
I do set the seating as close as I can to the rifling but, on my rifle, even after mag box mod, I can only get within about 20 thousands.
Any longer won't cycle smoothly for me.