MP-433-640 hollow point

[Shuz]

I recently bought the above mould in 4C from a member here, and while it cast's very well, I was surprised that the boolits weighed only 252g. With the gas check installed, the weight is still only 260g. I thought this design was supposed to drop nominal 270g with the gas check? My alloy is as close to 1/2 ww and 1/2 pure lead as I can measure. Perhaps what I thought was pure lead, ain't so pure? What kind of weights are you folks getting with the same mould. I also have the MP-433-640L(for light) and it drops boolits in the 230g nominal weight range from the same alloy.

[Cowboy_Dan]

Mine gives me 265 for the plain base solid. Also have the "L" version, it recently gave me 215 for the large, round hollow point and plain base.

[longbow]

I'd have to re-weigh mine but IIRC they weigh 270 gr. (or close) in solid and 258 gr. with the large HP pin. My mould is PB so maybe slightly heavier than a GC design.

Not sure if I have a selection cast currently. I'll have to check. If I do I'll re-check weights.

Longbow

[dkf]

Mine are 275gr solid with lube and an aluminum gas check. The large HP cavity subtracts 10 grains. It is a fairly recent run mold. I'm using range scrap.