You could use any 200gr data as well. There is lots of data for the Lyman 314299 mould which is a 200gr GC'ed .314" bullet.
I recently shot some 200gr .314" cast through my No.1 Mk.3 over 18gr of H4198 and they performed as accurately as jacketed.
Unique loads of 11, 12, and 13gr tumbled out of my rifle.
Loads of 18, 21, and 24gr of SR4759 did the same thing.
I have a heavily shot out bore in my rifle though so if the velocity is below a certain level or above a certain level cast bullets tumble. I need to chrony the Unique and SR4759 loads to see which way they are. My bore slugs .315" and anything under .313" cast tumbled. Anything under .311" jacketed tumbles. The mould was ordered for my P14 which slugs .313"; I just decided to try it in my Enfield for fun. I actually haven't tried them in my P14 yet
If anyone wants custom moulds made I highly recommend accuratemolds.com
They can make any bullet mould from .300" and up. It's $75 for a custom aluminum mould which is pretty damn hard to beat. Shipping to Canada is also a whole $5. I ordered a copy of the Lyman 314299 from them and they come out .3140" to .3145" with the alloy I selected in the checkout. They will custom cut the same mould down to .300" and up to .319"; you just need to put it in when you go through the checkout. I found out about them from the cast boolit forums and they are my current go-to source for any out of the ordinary moulds. They are also the ones I bought my 900gr .730" full bore 12ga slug mould from. They have a 1-3 week lead time as they cut each mould to order instead of keeping a stockpile.