Also taw, I believe stubble hit right. A broke in gun won't start getting group size from 2MOA to 1MOA. You might see some real differences at long range, but not 100 yards.

Some guns need 5 maybe 8 fouling shots to start really grouping well and keeping velocity spreads low. I haven't seen this for myself, but John Barshness sure does write about it alot. If I had a gun that wouldn't start shooting well until the 10th shot, it would be fixed or sold. Just my take.

Here is a load that I have seen work well in 2 of my guns and 2 of my friends guns. Seems very dynamic in many guns but you won't be burning up the chrono. Might make it to 3200fps.

93.5gr H1000 180gr Accubond or Partition 215M primer loaded to COL 3.62".