Hi Mas I am going to buy a Ruger SP 101 and I am trying to decide between the 2.5 inch barrel or the 3 1/16 inch. Does it make that much of ballistic difference out of the longer tube? What is a good reliably expanding mid-range load in .357 magnum? When I am carrying this as a primary it will be backed up by my Smith 642 in which case both will be loaded with the Speer 135 gr .38 +P load.This will be a carried mainly IWB. Thanks in advance.