I have a question regarding velocity. I don't have access to a chronograph and the velocities I have posted in the past are not accual readings, rather calculations. I have a 30-06 Ack pushing a 190gr SMK. Sierra publishes a BC of .533 for this bullet. I have made drop charts and for this particular rifle and everything I enter into ANY ballistic calculator gives me erroneous numbers. The reason I ask is either the BC is wrong or the velocity. For example: At my range I have a 40" rock at 1175 yds. I know that 30.5 MOA dialed in my scope will smack that thing every time. I know that at 875 yds., 16.0 MOA will smack the 24" silouette "dinger." I know that it only takes 5.25 MOA to hit the 500 yard target. So to get to the meat of the question, is the BC higher than published or am I pushing the SMK faster than what I think am? I live in Utah at 5300 ft. and the day I shot those targets it was 77* and 0 wind, I mean absolutely no wind whatso ever. I used Jacksonrifles.com ballistic program and to get to 30 MOA (1175 yds.)I had to enter 2950fps. but I was way off at 875 (18.73 MOA) and for 500 (7.81 MOA). I am confused, I guess I'll have to get a chronograph and quite bothering you all.