My book shows H380 only being used up to 130 gr bullets in the 280R. It looks like the 130gr 284 is the bore size equivalent of the 150gr 308 and the powder is not good for the heavier bullets.
Patron Member NRA
"I would not be an old man if I had not been an armed young man." JTJ
I was taught to respect my elders but they are getting harder to find.