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Which Crimp Should I Use?: Description of Cartridge Crimp Type Comments

Roll crimps are recommended for rimmed pistol rounds and bottleneck magnum rifle rounds using bullets with crimp grooves or cannelures to prevent bullets from pulling under heavy recoil. Light taper or optional crimps are suitable for many bottleneck rifle rounds without magazines, while taper crimps help headspace cartridges on the case mouth without overcrimping plated bullets. No crimp is needed for bottleneck rounds without cannelures since the case isn't belled.

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3K views1 page

Which Crimp Should I Use?: Description of Cartridge Crimp Type Comments

Roll crimps are recommended for rimmed pistol rounds and bottleneck magnum rifle rounds using bullets with crimp grooves or cannelures to prevent bullets from pulling under heavy recoil. Light taper or optional crimps are suitable for many bottleneck rifle rounds without magazines, while taper crimps help headspace cartridges on the case mouth without overcrimping plated bullets. No crimp is needed for bottleneck rounds without cannelures since the case isn't belled.

Uploaded by

mabe002
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Which crimp should I use?

Description of cartridge Crimp Type Comments

Rimmed pistol rounds (.38 Special, .44 Mag, etc)


Full power magnum loads need a strong roll crimp
using cast lead bullets with a crimp groove, or Roll
to prevent bullets from pulling under recoil.
jacketed bullets with a cannelure

Straight or tapered rimmed rifle rounds (.45-70, .405


Heavier loads with slower powders require a
Winchester, etc) using a bullet with a cannelure or Roll
stronger crimp.
crimp groove

Bottle-neck rimless magnum rifle rounds using bullets Crimp is necessary to keep bullets from pulling
Roll
with a cannelure, to be fired in a rifle with a magazine under heavy recoil

Any rimmed round using a plated bullet with a Do not over crimp, and do not use these bullets for
Light Roll
cannelure full power magnum loads.

Bottle-neck rimless rifle rounds (.223, .308, etc) using Optional taper or
Crimp is optional.
bullets with a cannelure. light roll

Bottle-neck rimmed rifle rounds (.30-30, 7.62x54R) Optional taper or Crimp if these rounds are for a lever-action rifle;
using bullets with a cannelure. light roll otherwise, a crimp is optional.

Auto pistol rounds (.45 ACP, 9mm, .40 S&W, etc), Light taper crimp only to flatten the bell. These
Taper
with any bullet cartridges headspace on the case mouth.

Do not over crimp, and do not use these bullets for


Any round using a plated bullet w/no cannelure Taper
full power magnum loads.

Straight or tapered rimless rifle rounds (.30 Carbine, Light taper crimp only to flatten the bell. These
Taper
.450 Bushmaster, etc) with any bullet cartridges headspace on the case mouth.

Straight or tapered rimmed rifle rounds (.45-70, .405


Light taper crimp only to flatten the bell. Do not use
Winchester, etc) using a bullet without a cannelure or Taper
in lever action rifles with a tube magazine.
crimp groove

Do not use for full power magnum loads in a


Rimmed pistol rounds using jacketed bullets with no
Taper revolver or in a lever action rifle (OK for single shot
cannelure, or lead bullets w/no crimp groove
pistol or rifle).

You don't bell these cases, so there's no need to


Bottle-neck rimmed rifle rounds (.22 Hornet, .30-30,
No crimp crimp. Do not use in lever action rifles with a tube
etc) using bullets without a cannelure.
magazine.

Bottle-neck rimless rifle rounds (.223, .30-06, etc) You don't bell these cases, so there's no need to
No crimp
using bullets without a cannelure. crimp.

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