Tuning Slug speed 500mm liner 960 fps o.k. ?

I have tuned my Wildcat MK3 .22 compact at 960 fps with 20.2 NSA slugs through the 500 mm barrel. Is there any ( potential) issue shooting these slugs at this speeds provided they group well ? I ask as I do only find this kind of velocity in postings 600 and 700 mm barrel related .

(I have the ( huma) reg at 135 bar by the way with plateau around 985 fps.)

thanks