I'm still playing around with the [suspected ] tight bore 22-250 barrel..I loaded up some 223 diameter 45 gr hornet with 8.1 gr of unique..They shot just ok nice str8 line 3 shots up & down about 3 inch spread at 100yds...After that I was just plinking with those loads..I'm going to try to slug that bore..heres the plan ..I'll upset a reg 22 caliber 222 diameter slug & try to get it to go down a very clean lubricated bore with a good steel rod..I have one of the pusher things to fit on a cleaning rod...Think this will work out ..??? mike in ct