Taper roll crimp
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Re: Taper roll crimp
Taper crimps are normally used for auto pistol cartridges; roll crimps are for straight wall revolver cartridges. There are exceptions, but this is the general rule.
Taper crimps are normally used for auto pistol cartridges; roll crimps are for straight wall revolver cartridges. There are exceptions, but this is the general rule.
Re: Taper roll crimp
A roll crimp rolls the edge of the brass into the bullet, leaving the edge of the case curvred in.
Not so good with cartridges such as 45 auto, 40 S&W 9mm that head space on the mouth of the cartridge.
A taper crimp compresses the entire neck around the bullet leaving the mouth of the case parallel to the bullet.
A roll crimp rolls the edge of the brass into the bullet, leaving the edge of the case curvred in.
Not so good with cartridges such as 45 auto, 40 S&W 9mm that head space on the mouth of the cartridge.
A taper crimp compresses the entire neck around the bullet leaving the mouth of the case parallel to the bullet.
Re: Taper roll crimp
Roll Crimps also require a cannelure or groove for proper application. Roll crimping into a non grooved or cannelured bullet will often yield problems.
Roll Crimps also require a cannelure or groove for proper application. Roll crimping into a non grooved or cannelured bullet will often yield problems.
Re: Taper roll crimp
Deadshot is right...but if you NEED a roll crimp in a different place that the cannelure on the bullet is placed...as in a revolver with a shorter or longer cylinder than normal, or in a heavy recoiling handgun that is firing a bullet without the cannelure, the Lee Factory Crimp die is your friend.
Deadshot is right...but if you NEED a roll crimp in a different place that the cannelure on the bullet is placed...as in a revolver with a shorter or longer cylinder than normal, or in a heavy recoiling handgun that is firing a bullet without the cannelure, the Lee Factory Crimp die is your friend.
Re: Taper roll crimp
Basically, a roll crimper actually turns the case mouths into the bullet. Great for high powered (magnun) revolvers when shooting heavy bullets and for tube fed rifles.
About all a rimless straight wall handgun cartridge taper crimper does or needs to do is take the mouth flare back to the same diameter as the rest of the case body. Few autoloading handgun cartridges need a crimp to prevent bullet seating changes. Bullets can't be pulled forward against the front of the magazine and bullet grip alone is usually enough to prevent bullet set back by magazine hammering.
Basically, a roll crimper actually turns the case mouths into the bullet. Great for high powered (magnun) revolvers when shooting heavy bullets and for tube fed rifles.
About all a rimless straight wall handgun cartridge taper crimper does or needs to do is take the mouth flare back to the same diameter as the rest of the case body. Few autoloading handgun cartridges need a crimp to prevent bullet seating changes. Bullets can't be pulled forward against the front of the magazine and bullet grip alone is usually enough to prevent bullet set back by magazine hammering.
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