Crimp
- Thread starter villaman
- Start date
Crimp or not to crimp
Hello! Do you crimp your cartridges after seating bullet? I got mixed opinions on this as some suggested that crimp is important to get more or less same pressure for each reload, others were saying that it’s unnecessary as crimp is useful for semi-auto/full auto guns only and would make no...
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Three pages here.
So why some do ?
In the old days people thought it was, the idea persists and people believe nonsense on the internet
To be fair I think in big boomers it was perhaps a benefit in holding the bullet in place during recoil. Dunno, others will.
Most bullets do not have a cannelure which is a bit of a hint ?
With a fixation on long range accuracy managing release forces is important and this is more precisely controlled by neck tension (hence neck mandrels etc) than crudely folding over a bit of brass into a groove which will require a higher force to release the bullet.
gunrunner
Well-Known Member
In days gone by, when we could own centrefire semi auto, for those who reloaded their ammo for them, it was necessary to crimp the bullet to cope with the force of the cartridge being pushed into the chamber. The action is a lot more aggressive than what we do with a bolt action, where the bolt is pushed forward by hand.
DG calibres and stuff like 45/70 all need crimping most cases .
I would say, don't crimp.
nun_hunter
Well-Known Member
It's a simple step to improve consistency. Is it as effective as neck turning, using bushing dies, weighing brass and sorting into batches, checking case capacity etc? Probably not but it costs less than £20 for a die and takes half a second to do per round and it's what they do with factory ammo which is more than accurate enough for the average user.
This. Most factory rifle ammo is crimped- chemical or mechanical. ~Muir
Without annealing, does crimping reduce the life of the brass any more than not crimping?
Foxyboy43
Well-Known Member
IMHO - no. The brass crimping element is removed when trimming the case to specs.
Unless of course someone knows different….
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