fourfive8
AH legend
- Joined
- Apr 27, 2017
- Messages
- 4,347
- Reaction score
- 10,195
- Media
- 261
- Hunted
- USA, South Africa, Mozambique, Zimbabwe, Zambia, Botswana
A Lee Factory Crimp Die is a collet type die. All other crimping dies either have a fairly sharp shoulder or a long taper sizing section. A sizing die minus the decapping pin and neck expander can be used as a taper crimp die. Most seating dies have a fairly sharp shoulder for roll crimping which is very different from taper crimping. Roll crimping is used on cartridges that do not headspace on the case mouth. Taper crimping is used on cartridges, like most auto loader pistol cartridges, that headspace on the mouth. A Lee Factory Crimp Die is kind of a stepped roll crimp type die that can be used for auto loader pistol crimping if not over done and if the mouth is not crimped into a groove or cannelure in the bullet's shank.
Belling, if over done, may cause the bullet to tip sideways when first being contacted by the seating plug. If the nose shape of the bullet is not compatible with the seating plug shape, the bullet may remained tipped when entering the case mouth and cause damage to the mouth. A slight and short depth enlargement of the case mouth which is not funnel or bell shaped is the best overall because the bullet base will sit in the case mouth square and plumb to the case axis and not have a tendency to tip or cock at an angle which gives the best chance to start and remain straight during seating.
Again, all this just thinking out loud.
Belling, if over done, may cause the bullet to tip sideways when first being contacted by the seating plug. If the nose shape of the bullet is not compatible with the seating plug shape, the bullet may remained tipped when entering the case mouth and cause damage to the mouth. A slight and short depth enlargement of the case mouth which is not funnel or bell shaped is the best overall because the bullet base will sit in the case mouth square and plumb to the case axis and not have a tendency to tip or cock at an angle which gives the best chance to start and remain straight during seating.
Again, all this just thinking out loud.