I'll try to post as many details as I can....first off I'll start with I have only been reloading about a month. I have a 1976 Remington 700 BDL heavy barrel in .243 with a 1:9 1/8th twist. The barrel has been cut to 16 1/2" and has a registered suppressor on it all the time. I'm using Remington R&P brass which really appears to be good brass compared to the garbage winchester stuff i have encountered. Per the Hornady 9th edition reloading manual I'm using Federal 210 primers and Hornady 105gr match 243 bullets. Here's (one of) the issue(s).....according to the manual (Hornady 9th), one of the powders on the list is "H4350". I thought that meant "IMR 4350" so I bought it except all the "IMR" powders are actually designated "IMR xxxx" like "IMR 4831" (which is also on the list)....however "IMR 4350" is NOT on the list. So what the heck did I buy? and could this be why the gun shoots SEVEN INCH groups at 100yds?....I have never seen a gun shoot so terribly...and its not the gun....or me. Me and this gun have consecutively hit torso sized steel plate at 500yds in a 10mph crosswind with factory 100gr ammo. So should I just make exploding targets out of the stuff I got and start over with a powder thats actually on the list?
