Nah, I did plenty of load development using published data without a chrono. It’s not needed to find an accurate hunting load, 9 times out of 10 you can get 1/2-1” at 100 by just shooting at increments, generally less than 30 rounds shot.Buy a chrony second hand, cheap, but if used properly will serve you well and you can always sell it on for what it costs.
It would save you floundering around chasing nirvana with inadequate real world data and save wasting consumables.
Ian
If you get into the realms of shooting calibres or combinations with no published data, relying on QL simulations etc. then yes a chrono is invaluable

