How accurate are Japanese rifles?

[rayg]

Well none worked well so back to the drawing board or just back to using jacketed bullets and forget trying cast bullets, Ray

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[ireload2]

You might make a chamber cast if your are trying to shoot a Type 38 or any other Japanese Metford type. My Type 38 and Type I rifles have 4 groove Metford type rifling.
I have not made a cast of my Type I but the Type 38 has no step at the end of the chamber. It just has a long taper from the case mouth to the land diameter. There is no parallel sided throat. This chamber leade to land diameter funnel might work better with oversize cast gas check bullets.
The bullet needs to be long and have a fat nose so the bore is sealed when the base pops out of the case neck.

[rayg]

Good info ireload2. I have even tried sizing down 8mm, (.323) cast bullets to .319 which is a good deal oversize the rifles grove dia's and that didn't work. I am just begining to maybe accept the fact that Metford rifling just does not work well with cast bullets and that rifling needs a harder jacketed bullet to fully grip that rifling. But I haven't given up yet. I will keep trying different cast bullet loads in both the 7.7 and 6.5 Japanese rifles for awhile. Who knows, I just might find the right loads. Ray