2013年3月8日 · The"punt gun" shell is a 410 2 1/2", the 2 next to it are a single and double 9mm, along with a couple of the smaller Floberts. According to me, there are single, double and triple shot 9mmRF’s, with the lengths as follows: Single 1.15" Double 1.43" to 1.57" (3 …