bullet slip

WhelanLad

WhelanLad

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Howdy,
after having issues with crimping an the .375winchester i got 9 out of 10 pills sorted.

But just in future, if i load 6 into my tube magazine, an one pushes back into the case.... "What is the problem?" with that


Just saying i didnt realise, it chambers an BANG......

Cheers
WL
 
other than getting powder to spill in the tube mag? Could be an interesting experience if it burns..... Your crimp die needs to be adjusted correctly. Lower the die a few thou at a time to better crimp the bullet to the case.

-Jason
 
Nah there wont be any Powder spill, as the straight walled case gobbles up a Big fat .375 flat base pill..

I generally try pinch them out a bit an grab em with my teeth an put tension on it, an belt it into a tree, i did miss an animal yesterday with one i "doctored" in the field..... but i wanted to know what would happen if i didnt notice as i cycled another round, an let off while the pill was in the case.

Yeah i just find the crimp isnt doin what i want it. reverse though, works a treat ha
 
I am not a huge fan of the Lee Factory Crimp Die for most calibers but I do find that it works very well with my 375 Win loads as well as 47-70. It puts in a really good crimp which should keep your bullets from moving back into the case and it is relatively inexpensive which makes it worth a try.
Here is the link to the Lee web site if you want to have a look: http://leeprecision.com/factory-crimp-die-375-win.html
 
hey Silverback i use a Lee Ftry Crp Die now, it doesnt crimp tight enough around the Hornady 220fn or the cannelures are too deep to grip enough.
i give it a solid crimp an if it needs i whip it around from the top an give it one firm crimp that way.
most are fine with that technique.

my Q is whats the problem of shooting a round that the projectile has been pushed back into the case of a straight wall crtdge.
no powder loss.
just forced back by the tube magazine its used in.
 
If it gets pushed back a little, not a big problem. If it gets pushed back a lot, and you are using max load with a fast powder, peak pressure will be very substantially increased.

The percentage decrease in volume inside a straight walled case changes substantially with bullet setback. Pistol cases with less volume are even more sensitive.

With a pistol case, such as 9mm, a 0.15" setback can raise peak pressures 200 to 300% (proof loads are 130%)

http://www.canadiangunnutz.com/forum/showthread.php?320822-Bullets-pushed-in-!!

http://www.canadiangunnutz.com/forum/showthread.php?322686-How-to-Safely-Discharge-Primer

Note at the end of the second thread, Boomer makes a comment about his 375.....
 
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ok . my loads are at say 1700-1800 fps which was a min start load in an old book but in newer published info its been upped a fair bit to around 2200fps max load, so im guessing pressure is quite low.

trajectory is several inches lower at 100m than Factory stuff and more Like a 38-55 . which is ok with me.

il try get some ohotos.
although today i oulled some projjies out with my teeth that were slipped in and they shot fine.
 
it actually shot 3 rounds into 2 inch group at 100m an if i didnt #### around on the first 'slipped' pill case an line it up properly i bloody well nearly put 6 into 3-4inch at 100!
 
Try trimming your cases, and instead of inside chamfering, just to a light outside chamfer if you need one at all. Then use a neck expander like you would for cast bullets to give a tiny flare to the case to allow seating. Once the bullet is seated, the case will have a tiny bit more meat to be crimped. Works with both the Lee Factory crimp die, or taper crimping, but if you taper crimp you may need to make a slight adjustment to lighten the crimp.
Other things,
Be sure the lube is gone from the case neck.
Do not taper crimp too hard. This results in a slight buckling of the case, and actually loosens it's grip.
Lee Factory crimp die (or at least the ones I have) properly set up cannot be over crimped. The collet fully closes.
 
they are lethal!?

nah i suppose its different lingos from different parts.

ill keep it in mind though, may tighten the groups up!! ;)

cheers WL
 
WhelanLad said:
Howdy,
after having issues with crimping an the .375winchester i got 9 out of 10 pills sorted.

But just in future, if i load 6 into my tube magazine, an one pushes back into the case.... "What is the problem?" with that


Just saying i didnt realise, it chambers an BANG......

Cheers
WL
Click to expand...

You might try this if you crimp with an RCBS or Redding style die . . .

Crimp as an individual step in the loading precess, understanding there might be small variations in case lengths, crimp each round individually. Back out the bullet seater so it can't touch the seated bullet, and loosen off the die's lock ring and back the die out a bit. Put a round on the shell holder and run the ram to the top of its travel. Now turn in the die with only finger tip contact on the die until refusal. This should produce a nice uniform crimp, regardless of neck length, prevent any bullet slippage, and your muscle memory will quickly become an accurate gauge of the amount of crimp you're applying with any particular bullet style. A grooved cannelure crimps much more securely than a knurled one. If you have sensitive fingers, you might want to limit your crimping to 10 per sitting. After I do a 100 like this, I don't want to crimp again for a while, and my fingers aren't particularly sensitive. I am becoming fond of the Lee factory crimping die though.
 
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