Heaviest .25cal slugs?

What are the heaviest/longest airgun slugs available in .25 cal? I have a single shot PCP and would like to have longer slugs, because its hard to fiddle small pellets/slugs into the breech.
In .257 options are over 100 grain, while .25 apparently caps around 60 grain.
I have purchased some Hunters supply slugs in .257 and brought them down to .25, using a lathe. Final weight about 90 grain.
The long shape is perfect for handling the slug, but results using home tools are not very consistent.
Is there any manufacturer that produce airgun slugs up to 80-100 grain?
Biggest slugs I know about are the Altaros King's with 66 grain and KingPB-82 with 63 grain.
Due to the tail the latter is actually a little bit easier to reload then the heavier Kings.
 
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I swge .250 slugs on Corbin equipment. What size does your gun require? Te .250 shoot great in FX guns.
Thanks for the offer. Maybe I should add that I'm located in Europe so there might arise difficulties in shipping from individuals, it might be easier for me to order custom made slugs locally. Anyway I'm not yet sure about the particular design yet, so first job is to find a slug design that is easy to handle with my PCP, that's why I want to know whats already out there.
 
Since you are in europe check out mp molds:


They offer a heavy .258, but cannot easily be sized down to a .250 (as you have found out):