Talk:General Discussion/@comment-1820055-20150612044843/@comment-24266290-20150612091209

I guess a fuller translation of that would be "While it doesn't have the same level of effectiveness as a Sanshiki volley via a large ship's main gun..."

ほどの効果 is level of effectiveness, so I see it as saying they have the same effect against land bases, but sanshiki is a higher degree.