Playing with slugs?

This is the best explanation of tuning procedure for M3 Impact I've found - concepts would apply to Maverick, Dreamline etc and valid for tuning for slugs or pellets:

Update on playing with slugs…
So I’ve got the 30gr spyda slugs grouping nicely out of the .22 Dreamline.
I turned the reg up from 125bar to 150bar, expecting to get more velocity out of them, but I finally managed to chronograph them today and even with the reg upped by 25bar, they are still only doing 760fps.
I guess the little 500mm barell is just not long enough to get a heavy slug up into the 900’s fps.
However, the groups at 25m are tight and today I zeroed it at 40m, consistently hitting a 25mm spinner at 40m with plenty of wind, so I’m going to be happy with that 👍🏻.
30gr slug, 760fps = 38.5fpe, I’ll take it.

I shot a rabbit with this set up a while ago, and recovered the slug to check its performance…
Shot said rabbit at about 30m. Slug entered just under the corner of the left side jaw.
Raking shot and after much digging and following the trail of destruction through the rabbit, I recovered the slug on the right side, under the skin between the last rib and the hip.
Went longatudinally through the neck, smashed the cerable vertabra, which is probably where it expanded against the bone, entered the thoracic cavity, went through the right lung making a mess of it, entered the abdominal cavity shredding the liver, went through the thin flap of mussel on the side and stopped u der the skin.
I didn’t weigh it, but it has lost minimal weight. It has expanded to 9.4mm at its widest point.

Pretty impressive performance 👍🏻

Sorry its the Impact M3, have you got the bottle version or normal tube? They are a fantastic rifle!!! Wish i had never sold mine!!

Hay guys Slugs don't come into there own until approx 60/70/80m +.. Depending what you are trying to achieve and what ranges or situation you plan on shooting.

You could use something like chairgun to get an idea of poi.