Myself also, the last two days I have been trying to get to the range to use my new CDE me chronograph on my Prohunter 45 with the Bergara barrel it has a .454 dia. barrel and I have started using .410 bullets in a crush-rib sabot and have very nice groups. They are a bit stiff loading. Now if I could just find out how fast 120 grains BH is pushing them 210 grain Gold Dots???!