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Rule3 Member. Find all posts by Rule3. Find all threads started by Rule3. Visit Rule3 photo album. Quote: Originally Posted by mikld Good pic of crimps. Find all posts by shield. Find all threads started by shield. Visit shield photo album. Find all posts by Fishslayer. Find all threads started by Fishslayer. Visit Fishslayer photo album. Quote: Originally Posted by shield Is the taper crimp indenting side of bullet 2nd diagram a problem to be avoided on 9mm, or OK if some indentation occurs?
Join Date: Feb Location: St. Paul smokey! Find all posts by johngalt. Find all threads started by johngalt. Visit johngalt photo album. Quote: Originally Posted by mikld Yep, the center pic is too much crimp. Anybody know anything about these dies? Roll crimp for pistol caliber ammo that is to be used in a revolver or rifle especially rifles with tubular magazines. Taper crimp for pistol caliber ammo that is to be used in an automatic pistol,.
When you roll crimp a lead bullet that does not have a groove it just bites into the bullet a bit. I'm always a little afraid of developing too much pressure caused by a crimp that is too tight. Gees, I though I was on to something with that taper crimp. Bad idea huh?? I have never taper crimped 44 or 45 Colt ammo, but have used this in 38sp.
If it will hold the bullet in place it should work. I've been taper crimping my cowboy rounds in my rifle and pistols for more than a score now. With cowboy loads you shouldn't have to worry about developing too much pressure with a tight crimp, although you should get a cleaner burn of your powder with a tight crimp. I use both roll and taper crimp on various cartridges but use a dial caliper to gage how much.
With either a roll or taper crimp, I try to measure a few thousandths less than the case. No more than that.
I also try to have a smooth transition between the lead and the brass so it doesn't hang up going into the rifle chamber. I have never experienced a buldge or split in my reloads, probably because I'm so afraid of over crimping. That said, it's always been with roll crimps. This is my first experience with taper crimps. As I mentioned earlier, I'm not used to not having a cannelure. I originally bought this taper crimp for loading plated bullets that also don't have a groove for target shooting.
Yes, bad idea. The problem with CAS loads ain't high pressure. Assuming you're downloading like virtually everyone else, pressure won't be a problem. What can be a problem is the less than firm hold the brass has on the bullet. This can cause the bullets to walk out in a revolver or walk in on a rifle. With the revolver, recoil snaps the gun rearward on every shot. Inertia being what it is, the dense lead bullets want to remain where they are more than the rest of the gun. The bullets tend to walk out a little bit with each shot.
I've seen bad cases of this where the bullets walked so far out in a Colt clone that they contacted the frame and prevented the cylinder from rotating. When I tried to cock the hammer, it wouldn't even reach the half-cock notch before the cylinder bound up. The other issue is bullets being pushed deeper into the case by the magazine spring. I've only seen this happen in a Winchester 94, but virtually all lever-actions are susceptible to it.
As more cartridges are added to the tube, the spring gets firmer. At some point it can be pushing on the cartridges so hard that the bullets sink deeper into the case. I dont think anybody else uses that term. If you search on the phrase "factory crimp die, you'll learn more about why many folks like to use it, though not everybody does. Usually you would want to roll crimp bullets in their apposite crimping grooves.
This kind of crimp is intended for revolver bullets and those semiauto bullets that headspace on the case rim, to prevent bullet travelling forth during recoil. This kind of crimp is intended for semiauto bullets that headspace on the case shoulder: it is higly recommended that these kind of bullets i. Images made to greatly exagerate crimping effect. Factory crimp term used by Lee is nothing else than a crimping die with a sizing carbide ring added, to get rid of any bulging of the complete round due to bullet seating.
The carbide ring, on press lever downstroke, resizes the complete round ensuring it complies with "factory" specs for a loaded cartridge. Start new topic.
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