I have that same mold TT, the deep skirt ones i found do better than the heavier shallow skirt. These are my best shooting cast projectiles. Don't bother with that barrel shaped .30 mold from NOE. They are all over the place.
I size those pellets to .299
They're heavy huh? Need some serious HP to get them up in speed.
I am still not having much luck with 50 yard groups with this mold out of a 700mm STX. Any tips? I have worked with the cast and sized and weight sorted them. They look good, but can never get the sprue cut perfectly rounded. I have tried different casting temps and different speeds up to 978 fps. The best I can do with these cast are around 2 to 2.5 inches at 50 yards.
I will be trying them in a 700mm slug A liner soon. I also just checked my casting batches closer. The ones cast at higher temps I can size to .301 and they weigh in the 47.5 grain area. The 46.5 gr cast temps have smaller diameters and can only be sized at .299 or .30 and still see markings from being sized. I have tried sizes from .298 to .301. There doesn't seem to be a discernable difference in groups, but speed changes a good amount between the different sizes.