Honestly, I have, well don't, keep track of how many trips to the range any of my firearms make.
Unless testing new recipes or staring on developing a reload recipe for a new or new to me firearm; I usually take 10 to 30 rounds of test ammo run the test ammo over the chrono, run the math, and go from there.
And since I'm already at the range, I have pre-planned to take other firearms to also shoot, at least 4 others, with 50 to 100 rounds per firearm. What dictates the number of rounds per weapon is how many rounds I want to send down range from that weapon. As far as the big bores the 375H&H and the 458WM same goes, 60 to 100 rounds each down range in one session.
My routine: shoot 2 to 4 rounds, with time between shots, then rotate to another firearm, by the time I have rotated back to the first firearm the barrel has cooled/ is cold. Then repeat. Intermittently, at some point, multiple times throughout the session, I'll speed shoot: first shot off sticks with second shot either off sticks or offhand. Trying to immulate a fast second follow up shot on game. Doing this at 50 and 100 yards, IF I'm the only one at the range then I'll move forward of the tables/benches to 40 and 70 to 80 yards at the 100 yard range from the same spot I'm shooting the 40 yard target.
Always follow rule #1 never have a weapon and no ammo for it. So I always leave the range with at least 5 to 10 rounds per weapon with exception, my carry guns, I maintain 50 rounds on hand after range time.