Consistency of springer muzzle velocities

[18 Wheeler]

If your HW80 is new then it will take 1000+ shots to stop dieselling and settle down. I'd consider a strip and relube.

If it's second hand then again you don't know it's history so a stripdown would allow you to check it over and lubing it should give good consitency assuming the basics are sound (Spring, piston seal, breach seal and no damage).

My 97 is tuned which clearly helps, but I recently bought a HW30 second hand and over the chrono with JSB RS (Falcon Acc Plus) the chrono readings gave a 3fps spread (6 readings were 676fps), that could be a freak data set with all the variables working for me.

It was only a 12 shot string because by then I had got all I needed to know. Legal, yes. Consistent, yes.

I would expect most springers to give 15fps spread or less with a pellet it likes, and the SD will probably be sub 5. Don't get too hung up on this though, what's the accuracy like?