Regarding testing a mousegun off sandbags... I may be missing something but, why? I understand the desire for hard PERFORMANCE numbers but long range accuracy is not part of the performance envelope of a mousegun. It's like asking how a Chevy S10 performs at 120MPH or carrying 62,000lbs of scrap metal. Relevant performance vectors for a pocket pistol are reliability, velocity, jammability (especially operator-induced failures), snaggability, ease of jam clearance, etc..
Oh, and regarding capitals ... it's a generational thing. Younger writers, especially those who grew up using instant and SMS messaging systems, don't use old style capitalization and punctuation.
Young person: im not sure what your problem is but damn get a grip
Old person: I'm not sure what your problem is, but, damn, get a grip!
when i know im writing for people my own age and younger i usually use the modern rules When writing for older, or mixed, audiences I'll stick with the more classical rules. Both are correct within their contexts. The mistake I usually make is using the classical rules with a modern audience. Many of my friends accuse me of writing like an old man because I use mixed case and punctuation when I shouldn't. Sigh.