Ghost Thinking of going .177 for slugs

[Solo1]

I need to switch to the blue spring, The 13’s and 16’s are going too fast. Even at 100 bar the 13’s were above 1000 on min, pw didn’t do anything. The 20’s do ok but I’ll get random fliers, the 16’s don’t shoot very well but I could only get them down to 980, not sure what speed they should be at?

Kinda disappointed about the 20 & 16’s, but the 13’s even going too fast were grouping more consistent.

I only had good results with the 13. Others have said 16 and 20 worked but not in my barrel