mold

[Riverside]

Who makes a mold, .459-300 gr+- with big grease grooves for BPC?

[RickinTN]

Accurate Molds can make most anything you want within certain parameters. I don't think the limitations will effect what you are wanting at all. I have not ordered a mold from Tom since this Covid mess but I think you would have your mold in hand in short order.
Good Luck,
Rick

[Gamsek]

https://www.mp-molds.com/product/mp-462-420-hollow-point-mold-multi-choice/

This is in stock.

45-70 Keith has also nice deep groves but is not in stock.

I have a 462 Hammer (also MP Molds) and it’s 300 grs but I don’t think that is what you are looking for
https://uploads.tapatalk-cdn.com/20210809/075f8140786480adc0934efe5e0e8580.jpg
https://uploads.tapatalk-cdn.com/20210809/352d3536f609bff5137e5e5c4387644d.jpg
https://uploads.tapatalk-cdn.com/20210809/a166e50d7212fd5d2fba21379849a0a5.jpg

[JonB_in_Glencoe]

Dick Dastardly's Big Lube Black Powder Shooting Supplies.

http://www.biglube.com/