For those with Arisaka's in 7.7mm,how deep does the rifling run?.Looking down the bore,it looks like the rifling has rounded edges,not nice and sharp.If I run a slug down the barrel,it hardly shows any rifling grooves at all.It does appear to Mic out at .316. I guess I need to bench this thing and see how it groups to be a worth while shooter.I plan on using a Lee 185gr boolit made for the 7.7/303 or a Lyman 314299 200gr.I will probably have to shoot as cast with a 4-1 alloy.(4 ww-1lino)or a/c ww's.I think I will use either FWFL or Ben's Red as lube.