Goodmorning. Allow me to say that in order of quality roll crimpers
1. Cortini and Pezzotti
2. OMV
3. GAEP
There are many types: for roll crimping only, for star crimping, for slugs, for carton shells. You can however choose a generic one and do everything. When you pass a shell crimped by mec or lee load all with one of those spools, it becomes perfect estetically. However the lengh is of course 2-3 mm less. This improves the combustion of the powder, creating more compression.
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 |