PCP's designed specifically for cast slugs

Hello, I am new to the PCP world but have been reloading and casting bullets for powder burners for years. I'de like to get a big bore PCP but see that large cal pellets are very costly and would much rather be able to use my own cast bullets. I cast for .30 .35 and .45 cals and have a plethora of molds for both rifle and pistol bullets. I have heard of people using cast slugs with success in some guns but not others. Are there any PCP rifles there were designed to be used exclusively with cast bullets?
 
The Air Force Texan's shoot slugs primarily but many brands do well with slugs. Mostly it depends on the bullet diameter vs the choke, sometimes a bullet a couple thou undersize shoots best through the choke. Benjamin has a nice .357 for slugs

I have several Marauders and one shoots slugs great and its brother rifle does not... such are airguns, sigh.

And you could do what I have done, barrels are relatively cheap and I have bought an unchoked TJ's barrel before and built a dedicated slug gun (because pellets have a poor reputation in un-choked barrels) {no website but Mike's phone # is 859-635-5560, paid $114 for my last .25 barrel} Or a Lothar Walther barrel.

 
FX (and some other brands) can only shoot pellet like slugs but they don't have enough power for real slugs, like 40 something grain .22 slugs at a speed of over a 1000 fps (this matches 22LR bullets and speeds). For those thins you'll need an airgun with a 22LR barrel and the airgun should have some balls to produce enough power.

In the Netherlands we have 3 manufacturers for airguns that are specifically designed for slug shooting.
Drummen custom guns: https://www.drummencustomguns.com/nl/1143-dz-sinner
Beaumont Airguns: http://airguns.nl/nl/shop-products/118/luchtbuksen?subcats%5B119%5D=1
Kurvers schietsport: https://www.kurversschietsport.nl/

Drummen and Beaumont are "production" guns and Kurvers is only custom projects as far as I know.
Downside of these guns: the price. All cost a fair amount of money and need to be externally regulated since their air consumption can be enormous. But if you are able to cast the bullets yourself each shot will only cost a cent. Beaumont airguns can be set up to have a couple of consistent shots from the tube but don't expect more than a couple of shots, especially at .308 and upwards.