This morning I shoot a ten shot group at 100yds, for some unknown reason and end up with two groups. One center target and one 8in low and 6in left! So I puzzeled thinking "first time with this Triad rear bag, mabe I'm releasing the bag or some NPA issue". When I'm done(50rounds) and real confused, I notice the brass is "skinned up" on the end like it was to long and shure enough it was way to long. Could this brass length caused this? This was strange!