Yup I split my point forming die too. What a pisser.
You need a 1 cal ojive point forming die. Seat cores first then turn around and put headstamp into point form die. Do gently and you will probably need to turn around several times forming GENTLY until you get the result you want. By forming gently, you won't completely expand the bullet to fit the point forming die until you have the shape right and the jacket folded over the base. I'm sure Hickory is right and you can get better results with J4 jackets which aren't as brittle. I believe I got the ones I have from Larry Blackmon in LA.
I generally deat the core in the point form die, flip and reinsert to just round the base, flip again and flater the base. Using the fressure to detrmine the point,
like these
maybe not exactly what you are wanting, but I have used brass BBs in the end of the bullet and then adjusted the lead inside and the weight and length until the point formed over the top of the BB and then used the point forming at the tip with a dish shaped punch to press the last bit of jacket over.
I did not like the edges of the jacket and later seated the BB deeper and formed a regular point, it works as a mechanical expander and has some penetration (used with .223 rem. and .22 LR jackets).
Just fold copper on lead...
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 |