Best slug for a .25 Sumatra???

I need the experienced voices of you .25 Sumatra shooters!

Can you recommend a most accurate slug (specific weight, diameter and manufacturer information preferred) for a Piatt tuned .25 Sumatra? I haven't messed with slugs up to now, and even now I expect it will just be an occasional endeavor. Also, if you have any slugs you would specifically stay away from for this gun, either because of length or poor performance, that would also be appreciated.

And if you have a favorite pellet for this gun at the lower power settings, say 820-880fps - that would be appreciated too. 

Thanks much!
 
Shooting slugs out of the Sumatra is a pita without the Oring mod to hold the slugs in the magazine. I've had good luck with hunter supply but I had to resize them to get them to shoot accurately. I found.252 size slugs work the best. I also found that the varmint knockers that are cast from the MP 6.35 mold but he doesn't seem to offer them anymore. Sorry I couldn't recommend ready to shoot slugs but those are the only ones I've tried.