Having tried out variety of sizes of balls for my new Jaeger rifle, it seemed that .610 was the best choice.
I had already been checking out ballmoulds.com before and liked the simplicity and material (brass) of their molds, so I decided to order one from there.
Measuring the barrel and taking shrinkage/patch thickness into account as listed on their site, it suggested a .609 which matched my experiences so far, so that's what I ordered,
Obviously a one person business, but order was processed, made and shipped quickly and only took a week to arrive from the UK.
Apart from applying a bit of soot on the interior, I did no other mold prep and already after 10 or so castings, they started to look ok and another 10 or so, they looked perfect.
After 40 or so, the mold would get a bit too hot, which I then used as opportunity to add more lead to the pot.
Occasionally, the mold-halves wouldn't line up properly, but it was really easy to just re-open/close again. There's no pins, just interior guides and in general it works quite well.
I had 120 after an hour so, which should be enough for a while. I had already re-melted the early wrinkled ones and while cutting the sprues off, I only found one ball that didn't look awesome (but still better than most bought ones).


Pictures don't really do them justice, but I would recommend these molds to anyone looking for custom sized round ball molds.