September 24, 2013 On this week’s Mail Call Mondays, John McQuay discusses optimal charge weight (OCW) and optimal barrel time (OBT). Share this gun video:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)