Hello all...I am kind of dismayed and all. I have a UMP and two 45 cal cans for it...After zeroing the HK if I am not within 10 yards of the target silhouette the bullets completely miss the target...at 10 yards they are about 10 inches off at 2 Oclock...again, at 25 they I completely miss the man silhouette target ...The cans are two diffrent models, one can be shorten and used in that configuration. As far as I can tell there are no baffle strike. Any ideas, because I am fresh out here! Thanks in advance...