hairs on my mold (flash)

[luckydawg13]

OK i get this flash  hairs on my bullets when i cast not all the time but a lot the mold half's are clean i stop brush off start to cast OK for a few shots then i get the hairs RCBS 245 gr swc melt temp is 730/750 i cant see light when i close mold ? mold is clean
thanks

[mauserand9mm]

Definately not closing properly. Maybe try a small amount of Alox on the alignment pins in the face of the mold halves? Small dabs of lead will also prevent closing fully but this only happens if they weren't closed fully in the first place.

[luckydawg13]

i have a bottom pour pot i was holding the mold right up tight to the spout once i left a gap hairs went away

[.22-5-40]

Hello, luckydawg13.  I have seen those "hairs"...I call e'm whiskers, on some SAECO moulds.  I see your melt temp. is way up there.  Are you bottom-pouring, or dipper casting?  If using B.P., is nozzle in contact with sprue hole?  You could be "pressure casting" and while this certainly looks to be filling cavity..it can also trap air and cause voids.  I would try backing off heat..I usually cast around 600-650Deg. and see if that helps.  The fact that it doesn't happen all the time rules out lead deposits I think.

[luckydawg13]

thanks i will back off on the heat my bullits look frosty yes I'm bottom pouring yes i was pressure casting first time using a BP heck this is my first time casting thank you for the help
jim