12-10-2020, 03:19 PM
Nimrod Wrote:Ive got a LBC with a 20 bull barrel. This rifle typically puts five in the same hole at 200 yards. Suddenly the groups have opened up to 1-1.5 with known proven loads. Barrel is clean, no copper. Everything is tight. Ive got probly 3000 rounds through it. Swapped scopes, 3 times. Dont know where else to look. Cant believe Ives shot the barrel out yet. Could it be bolt fatigue? No visible cracks or anything but it does appear to be slightly stretching....if thats even possible. Just looking for advice.
What was the air temp? Humidity? Dew point? Barometric pressure?
Was this the first time shooting those loads at that air temp?
Also check your jump to lands, could be your barrels throat has moved enough too put your jump to long and the group starting to open.