working up a load for a new bbl on my 600 yard bench rifle and hopefully fclass rifle,,it is a single shot Stiller PredatorV RBLP in an TRacker stock with a Jewell trigger,,I had the throat punched out to seat the BIB 135 BTs above the NSJ and the freebore worked out to .215 so my loads may be hot in a shorter freebore,,,bbl is a 30 inch 4 groove Krieger..
getting groups less than .200 at 100 yards with 42.5 H4350 and 38.5 Varget and around 2950 fps with both loads,,,only got 75 rounds on bbl and will take it to 600 to fine tune loads once I get 100 rounds on bbl,,,,the long freebore allows for higher powder charges and the 30 inch bbl helps also,,
the 135 BIB BT is advertised at .615 G1 BC and at 2950 should make a heck of a 600 yard load if the accuracy holds ,,wil update after shooting at 600,,
with the ,215 FB the 135 BT OAL is 2.795 .016 off the lands,,