Maverick help needed,converting to mid weight slugs for pesting?

Hi! Love the .25 Maverick w/ 600 mm barrel and no complaints but would like to setup/switch to a slug for a dedicated pest gun. I'm not looking for long range shots but just 50-80 yards with the occasional 100 if everything is right. Right now gun is mostly stock shooting the 34g FX pellets. I purchased the carbon fiber liner but not installed yet. My question is, do I stay around the 34g in a slug? Will I need the heavy liner and what brand or weight slug is going to be my best bet for those ranges? Oh and a tune if you have one would be great too! Thanks in advance!
 
I keep thinking I should try a Superior heavy liner but I never order one. 

It's hard to spend the money when my rifle shoots as good as it does !

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Anything over 25 grain slugs the heavy liner is suggested. 25 and below standard superior liner works great. I have the 700mm standard superior liner on my maverick and it’s a laser with the nsa 24.8 slugs in a .218 head

Where did you find those. Neilson doesn't list anything under 26.8 and doesn't show head size at all for 25 cal.
 
I have had good success success with the following slugs and speeds out of my Impact 700MM standard Superior liner. These are without the carbon liner. They were tested @ speeds above 1000fps to below 900fps. They grouped very well at 100 yds and beyond. I choose the JSB KO as my hunting slug due to the terminal performance. I was shooting oranges with the below slugs @ 50 yds and the KO's were devastating. I regularly shoot these at Prairie Dogs and Ground Squirrels past 100 yds with accurate humane kills.

FX Hybrids @ 950FPS (These also shoot very well, sub MOA out of my wildcat 600MM superior liner @ 890 FPS) 

H&N 36g .250 (.249 shot horrible) @ 930FPS

JSB KO 33.49 @ 960FPS
 
Anything over 25 grain slugs the heavy liner is suggested. 25 and below standard superior liner works great. I have the 700mm standard superior liner on my maverick and it’s a laser with the nsa 24.8 slugs in a .218 head

Where did you find those. Neilson doesn't list anything under 26.8 and doesn't show head size at all for 25 cal.

I think he might have been referring .22 caliber? 

Gbikerman, thanks for that info!