I have never had trouble getting consistent accuracy with a .358, but I tend to use heavier boolits, too. It brings to mind when I was still using jacketed bullets, and shot an antelope with a light for caliber bullet in .338 Win. Mag. I could actually see daylight through the critter when I shot it, and never used a light bullet again. A 250 gr. always performed pretty much like a cast boolit should, with being able to eat up to the hole.