Moving from Pellets to Slugs

So I have a very accurate Kalibrgun Cricket .25 shooting 25.39 gr pellets. I have a pesting permission shooting pidgeons on a dairy farm. A vast majority of my shots need to be between 40 and 90 yards. Wind has become a factor at 60 yards and above. Seeing as how slugs will be less impacted by wind, what would be the best slug weight to step up to when testing slugs to beat the wind and also keep the tuning adjustments to a minimum? I know the answer is.. buy some and try some. But I am hoping someone is shooting something similar and can keep me from having to re-invent this wheel all alone.
Thanks
Dave
 
I did not request advice on how to be careful. Spare me your elementary comments.
Please be careful at the dairy shooting slugs. Slugs carry a lot of energy down range. No problem shooting away from the cows like most of the shots by the S. African guys.
W to be careful with slugs.
We have tested our slugs also in the Cricket. The best results were achieved with the combination of the diameter .249 and a weight of 30 grains. However, the average speed of 855 FPS was a bit below the usual optimum between 900 - 1,000 FPS.

Best regards

Jörg
Do you know the ballistic coefficient on the H&N .25 / 30 gr slugs? Or where I can find it?
 
I did not request advice on how to be careful. Spare me your elementary comments.

W to be careful with slugs.

Do you know the ballistic coefficient on the H&N .25 / 30 gr slugs? Or where I can find it?
Are you having a bad day? He just offered some friendly advice. No need to jump all over him. I hope your day gets better