Hi guys.I have a model 36 and want a good defense load for it.It is an older gun but still very tight.Are semi wadcutters a good choice?Or should i go with HP ammo.Right now i use Federal hydra shock ammo standard velocity.I have heard most .38 HP ammo works best out of 4" guns is this true?Is the .38 SPL a good defense round?I heard of an old man in san fransisco recently that shot and killed an intruder that was advancing on him with a crowbar or something.It worked for him!Any help would be great!