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RE: Just another mould..or two.
Gavin,
That looks like what I shoot. I adjust my mould to .325 for the 1/19 twist and 1.4" for the 16 and 17 twist.
The blemish you see on your cast.
Start your cast with the sprue plate on the side and mate the ladle spigot tight starting the pour slow and slowly rotate the mould upright and lift the ladle letting it dribble over the hole.
That gray blemish is trapped air when you have the plate on top when starting the pour.
Y'all have a Merry Christmas Gavin and hope to see you this coming season.
Stay well.........Kurt
The reason a dog has so many friends is because he wags his tail instead of his tongue.