While a chronograph is hugely helpful, you don't actually need it to get your rifle setup for ranges in the 1000 yard and less.
It does make it hugely easier & does make you have to take way less shots to find out.
People were building dope tables when no electronic devices were available for many years.
But check published velocity against test barrel length, get a pretty good guestimate what it should be about, get a good 100 yard zero then slowly walk out your ballistics & adjust as needed.
You will want to eventually invest in a chronograph or at least borrow one as it make things way easier especially once you do reloading & accuracy tests on various ammunition.