The vel. loss won't be dramatic with this modest case. But there is no substitute for checking the vel. in
YOUR barrel. Different barrels of the same length with the same cartridge & the same load can & often will vary in velocity. I would ask around at gun shops
for someone who has a chron. who may be willing to check your vel., or if you have short term budget concerns you could go in together with friends & buy a "chrony".
Anything else is guessing.
Getting a chron. many years ago was an eye-opening experience!!
Some readings were very different than the fact. ammo data or reload manual data, slower than stated more often than faster than stated.