No way to add weight that I'm aware of - I was merely repeating the annalogy you made, Dennis.

I understand your suggestion in trying the lighter weight slugs, however there must be a Lee mould in that range as well and probably as cost effective or more so - which if unsucessful in shooting is still useable or saleable to someone else. This is why I mentioned the moulds. I've gotten to liking undersized round balls due to the lack of fouling - so far no plastic and definitely no lead.

Note - if using black powder (real or imagined), do not use plastic - unless it is very well protected from the flame - BP flame will melt plastic onto your bore - what a mess when it includes BPowder fouling.

Seem to me, Lee moulds still around $19.95US for single cavity and $24.95 for Double Cavity. The very large sizes are available only in single cavity.

In the past I've gone the route of buying balls for testing avaiable from Track as well, but by the time I received a small bag of 25 balls, they ended up costing as much as the mould would have. I could have cast some up for testing, and kept the mould for something else (normal for me) or sold or loaned it out for someone else's testing. I find having various moulds "in stock" quite handy, in fact- like the variety of sizes I have for testing in 12 bores. comes in handy. The smoothbore of my Mossberg is backbored to .736" - so the .735" ball is perfect. The rifled barrel is .724", so the .725" mould I have work OK for the initial test. The .715" worked, but the .710" ball in gas-check cups is more accurate. I still have the .740", .684" and .662" moulds in reserve for other testing, depending on the gun/barrel(s) I'm shooting.

Buying 'extra' mould sizes, if possible, is never a bad idea.