grease groove type

[porthos]

saw a WTB ad on this site. someone wants a lyman 429421 mold with square bottom grease groves. what would it matter if the groves were round or flat bottom??

[Mk42gunner]

It was originally designed with square (almost, a few degrees of draft) lube grooves. They do hold more lube than a rounded one.

Robert

[gwpercle]

saw a WTB ad on this site. someone wants a lyman 429421 mold with square bottom grease groves. what would it matter if the groves were round or flat bottom??

Back in the day ... bullet lubes were not exactly high tech. and the more bear grease and hog lard lube you could get in there the better . Elmer Keith insisted on square bottom lube grooves and at first Lyman / Ideal made them that way ... then Lyman changed them to round bottomed and Elmer had a Hissey Fit and wrote letters and generally said they were wrong to change them .
Well ...honestly Today in the year 2021 we have much better lubes and can get buy with less lubricant . Some people think the square bottomed grooves are better and they might have been back then with poor lube but not today . With good modern lubes I haven't found that they shoot any more or less accurately .
Gary