is crimping NB??
- Thread starter Dehan
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Chawbaccer
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Most seating dies have the crimper built in. I see no need to crimp the 7x 64. crimping can shift the point of impact. And many bullets don't have a crimping canalure.
FROGO207
Member
Some say that crimping will improve the ammo, some say it hurts your results, some say it makes no difference. I have tried it both ways with a lot of cartridges and have personally found no reason to crimp. That said, with heavy loads on handgun rounds and with tubular MAG firearms you DO have to crimp your ammo to prevent bullets from moving under recoil. It has been said that a crimp will provide more consistent velocity in your ammo. If you have good bullet tension and keep your propellant amounts consistent your ammo will not gain from crimping, at least these are the results I have experienced when I reload. YMMV
ranger335v
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"is crimping NB??"
I give up, what's "NB"?
I give up, what's "NB"?
gamestalker
member
I suppose one might find a need for crimping bottle neck cartridges if they are for an auto loading action. But in 30+ yrs. of reloading, I have never experienced any bullet set back or change in OAL for any type of action to date. For the action you are loading for crimping would just be one more unnecessary step to perform, in my opinion.
GS
GS
Certaindeaf
member
I think NB means "not bequired".. that's my guess anyway.
Crashbox
Member
"Not Bad"? "Necessary Because"? Puzzled here too.
MtnCreek
Member
Needless Bull...
If you add crimping to your proceedure, you'll need to trim every loading for best results. For rifle ammo, about the only thing crimping adds is time. YMMV.
If you add crimping to your proceedure, you'll need to trim every loading for best results. For rifle ammo, about the only thing crimping adds is time. YMMV.
Certaindeaf
member
^
nkof!
nkof!
Vern Humphrey
Member
In general, crimping is needed for cartridges shot in tubular magazines -- to keep spring pressure from pushing the bullet back into the case. In handguns, crimping is needed to hold the bullet in place during firing -- revolvers, for example, can have their bullets "walk" out of the case mouth under recoil from preceding rounds.
In bolt actions, it is possible to have the bullet set back when the front of the magazine well slams into the bullet noses -- but the solution to that is to epoxy a small strip to the magazine wall at the shoulder point to keep cases from moving forward under recoil.
Except for the above, however, rifle cartridges are generally better off without crimping.
In bolt actions, it is possible to have the bullet set back when the front of the magazine well slams into the bullet noses -- but the solution to that is to epoxy a small strip to the magazine wall at the shoulder point to keep cases from moving forward under recoil.
Except for the above, however, rifle cartridges are generally better off without crimping.
musicman10_1
Member
No Bueno ???
longdayjake
Member
So, what is this thread about?
JohnM
Member
Simple.
The OP wants to know if crimping is NB.
The OP wants to know if crimping is NB.
I noticed that my 7mm08 reloads would shoot lower and lower each visit to the range. I thought at first the scope was not holding zero. Then on the next reload I discoverd the necks were hard enough that even when sized, the bullet could be shifted with finger pressure: the neck tension had evidently been declining with each reload, affecting the point of impact.
My theory is that crimping masks this effect of different cases at different stages of hardening (resulting in different neck tensions) by supplying a crimp that sets a more constant release (if the hardening doesn't foul that up too!)
I started annealing necks to keep neck tensions more uniform and cycling through brass more uniformly, and point of impact got back under control -- still with no crimps.
So I think attention to brass condition and resulting neck tension is the real issue, moreso than crimping.
My theory is that crimping masks this effect of different cases at different stages of hardening (resulting in different neck tensions) by supplying a crimp that sets a more constant release (if the hardening doesn't foul that up too!)
I started annealing necks to keep neck tensions more uniform and cycling through brass more uniformly, and point of impact got back under control -- still with no crimps.
So I think attention to brass condition and resulting neck tension is the real issue, moreso than crimping.
JohnM
Member
come on man- tell us what the hell NB is supposed to mean!Certaindeaf
member
I think it's code for something.
JohnM
Member
gotta be, but what get around a bunch of shooters or reloaders and you'll hear all kinds of abbreviations, this one's impossible to figure out.
The answer is more interesting than whether or not the guy should crimp a particular round
JohnM
Member
ain't a lot of us hicks used to using abbreviations for Latin terms
Vern Humphrey
Member
"Nota Bene" -- Note Well.
jmorris
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I figured it out. NB stands for "needed" after you get home from the bar and are cooking a frozen pizza at 2:17am morning (time stamp on post). The only reason I know liquor was involved was that the OP couldn't figure out what he was trying to say.
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Certaindeaf
member
Now this is just getting crazy. What the heck does lol mean? lolz
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