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Seeing as the photograph was taken on Peleliu, I'm guessing that this monster wasn't just used on Iwo Jima and in China.-- 172.190.68.60 ( talk) 08:00, 11 July 2012 (UTC) reply

Taki's Website mentions what's written in here, maybe he#s the source (also given as link). The Peleliu battle page in Wikipedia mentions 150 mm mortars. 87.78.212.25 ( talk) 05:57, 26 September 2014 (UTC) reply

Identical (maximum) muzzle velocity is almost impossible with different barrel lengths. it would require a conscious effort to match the MV through a tailored propellant charge (would make no sense) or a huge coincidence with different propellant charges. The MV and the rangea re almsot certainly not identical between long and short barrel versions. 87.78.212.25 ( talk) 05:56, 26 September 2014 (UTC) reply