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http://www.lonesentry.com/articles/jp_type97_tank/index.html
THE MOST EFFECTIVE JAP TANK
Recent combat reports indicate that the quality of the 47-mm armor-piercing, high-explosive projectile has been improved.
Moreover, tests show that the 47-mm tank gun will penetrate the U.S. M4A3 at 500 yards or more. In combat,
one U.S. M4A3 medium tank was hit six times with armor-piercing, high-explosive rounds from this gun,
at an angle of impact of approximately 30 degrees. Five complete penetrations and one partial penetration resulted.
The range, according to members of the U.S. tank crew, was approximately 150 to 200 yards.

チハ新砲塔型は「もっとも効果的なジャップタンク」との評価で
M4との戦車戦で6発の命中弾のうち5発が完全に装甲を貫通して1発も不完全ながら貫通したと書いてあるが