I have an RCBS 250K mold that drops at .430" It worked fine when I then powder coated the boolits but I have since gotten a lube sizer and now the mold needs to be enlarged a couple thousandths. This thread should help get the job done. Thanks!
I have an RCBS 250K mold that drops at .430" It worked fine when I then powder coated the boolits but I have since gotten a lube sizer and now the mold needs to be enlarged a couple thousandths. This thread should help get the job done. Thanks!
The cheapest, easiest way I know is to Beagle it.
Do a search, there are lots of posts and should be a sticky.
Next is to lap the mould. Lapping just a couple thou is fairly easy but much beyond is work... at least with an iron mould. There are stickies on lapping too.
Longbow
an old post but never answered. to find the center, with a bullet in the cavity line up a straight edge along the two mold halves and scribe a short line near center with a zacto knife. Open mold and rotate bullet 1/4 turn and scribe another line along the the axis of the mold halves. The X is the exact center of the bullet or close enough for what we are doing.
Last edited by oley55; 08-20-2022 at 11:23 PM.
“Some people spend an entire lifetime wondering if they made a difference in the world. But, the Marines don't have that problem.” Ronald Reagan
I have an old Lee single cavity .309" mold that I can't wait to try this on. Awhile back I had a .44 mag Handirifle with an over sized bore that I tried to lapping out a mold for. I bought a .429 RN Lee mold on sale and proceeded to lap it out. I ended up only enlarging it .0005" but is it ever shiny and it drops really pretty boolits... I sold that .44 barrel and now I shoot those boolits out of my old Ruger Blackhawk...
Tony
Hi, my name is Tony and I'm addicted to gunpowder.
AKA Geezerbiker
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |