From what I've been seeing, the Blackhawk has more range than its upgraded successor, the Sentenza. Having conducted tests on both, I have summarised that the animation and hit-box is appears, goes further on Blackhawk bullets than Sentenza. I am unsure if this is intentional or not, or affects the Ardent Defender and Silversix similarly, or the lower tiers have accidently longer range, however the issue is there.

Note: Some Sentenza bullets travel further than others (Blackhawk range) but vast majority do not.