Tuning m-rod .177 - I'd like to see if I can get NSA 12.5 slugs flying through it @900+

Why are you shooting at 50 and 60? When I start off with a slug in any of my guns, I start at 30yrds. At 30 you eliminate some factors like wind and you can be a lot more precise. If they aren’t all touching at 30, I don’t even waste any more of them until I try a different setting, size or speed. Once I get one hole or a larger ragged hole, depending on the gun at 30yrds, then I move out and hold my breath to not be disappointed.
 
@vetmx -- this is what I'm looking for - thank you. I do recall seeing a youtube video ( now that you mention it ) from BobO or one of those guys re: pretty much what you just said - nail it @30 and then take it out further. Will do - appreciate it.

@fuzzygrub - John - yeah on good weather hopefully coming! Good to hear on the covid shot. Do you have a pile of m-rod .22's? - AOA accidentally sent me some .22 magazines when I ordered .177's - they told me to keep the .22's and just sent me the right ones on their dime. Good on them - good for me! Problem is - I don't have a .22 m-rod. ( lol ) You want 'em? If so let me know and I can get 'em to you.