I did exactly as RangeRoy posted above. Used Strelok Pro ( roughly $12) with the blue WeatherFlow meter. Bluetooth connection to phone and it transfers all the environmental data to the Strelok app. Easy, seamless. I did eventually get a Kestral because it's a little more convenient, but I don't...
I've been using Savior's std 51" double bag or about 2 years and I'm very happy with it. but i only carry one rifle in it. 2 PRS rifles at once is a bit much for me!
Well just for the heck of it I shot it over the chrono with just 25 rounds on the barrel. 105 hybrid, 30.0 RL-15, Fed 205M, Peterson brass got me 2860 fps over 15 rds. Sd wasn't great at 14 but I think switching to CCI 450's will help with that.
In 6.5 Creed I've seen up to 60 fps difference switching primers. Loads were identical other than the primer and shot in the same range session/conditions.
If you want cheap but effective, try a phone app {I used Strelok pro) with an $80 weather meter. Not as convenient as a Kestrel but it will give you for real dope for just under a hundred bucks.