I shot my Toyo Kogyo Series 31 in a CMP Vintage Rifle Match yesterday. This was the first time I've used it in a match and I had a blast shooting it, although my results were not quite what I had hoped - 195-0X (I had 5 misses in the Off Hand phase)! For loads, I used Hornady 174 gr FMJ bullets over 39.0 grains of IMR-4064 and a CCI-200 primer. I used Norma cases and sealed the bullets and primers. For a sling, I used the Web sling off my Garand. The Type-99 can be a little temperamental in a match... During the Rapid phase, I lost precious seconds because of difficulty closing the bolt on a round, and wound up with a saved round (the match official allowed me an additional six seconds to get it off, so I did wind up with all ten on the paper). That straight-up bolt handle is different operating than my usual Vintage gun (my Krag). Still, I'll definitely do this again! I've included a couple pictures:
Shooting in the Slow Fire Prone phase.
Shooting in the Off Hand (standing) phase. I put the anti-aircraft wings down just for laughs...