Armory Sponsor
Posted: 9/4/2012 10:13:39 AM EDT
|
I have read the longer the neck of the case is the better supported the bullet is. The length of the neck also needs to be consistent to keep the tension on the bullet consistent from round to round.
Based on this info i started to load some "precision" longer than mag length ammo, when it came time to trim i was hit with this problem... Some cases oal was shorter then the (shooting from the hip) 1.760" that i wanted to use as my trim length. Some cases were much longer as well (which isnt a problem). so my question is, what do you do when cases are shorter than you want? Just load em up with a cheap recipes and blast em again in hopes they lengthen? or just set em aside in case you get desperate one day? eta trim length is 1.760" yes it is .223 |
|
Quoted: In 223, I trim to 1.755, cases shorter than 1.754 are not used in the batch. Get put in with the non precession cases. Cases longer than 1.756 get trimmed. I seat to mag length. That's how I do it. Are you saying you trim the case so that the cartridge OAL is 2.550 with your chosen bullet seated how you want it? I posted the wrong figures, edited my origional post, and this one too. dryflash3 |
|
Quoted:
I have read the longer the neck of the case is the better supported the bullet is. The length of the neck also needs to be consistent to keep the tension on the bullet consistent from round to round. Based on this info i started to load some "precision" longer than mag length ammo, when it came time to trim i was hit with this problem... Some cases oal was shorter then the (shooting from the hip) 1.760" that i wanted to use as my trim length. Some cases were much longer as well (which isnt a problem). so my question is, what do you do when cases are shorter than you want? Just load em up with a cheap recipes and blast em again in hopes they lengthen? or just set em aside in case you get desperate one day? eta trim length is 1.760" yes it is .223 Regardless of COAL or ogive to case head and where you set it, the 1.760 or less, assures the neck of the case does not bump into the end of the neck relief in the chamber. For correct AR positioning, the only thing that touches is supposed to be case shoulder to conical section in the chamber. There are very few exceptions. 
|
|
depends what your loading for, for a precision bolt gun you can get away with longer cases and bullets. for AR-15 ammo I trim the brass 1450,, much shorter, than spec. the gun always runs. with that ammo. if the ammo is a lil long,, you run the chance of jamming the gun. accuracy has not suffered,, that much if any,,, in my loads,, |
|
Quoted:
Quoted:
I have read the longer the neck of the case is the better supported the bullet is. The length of the neck also needs to be consistent to keep the tension on the bullet consistent from round to round. Based on this info i started to load some "precision" longer than mag length ammo, when it came time to trim i was hit with this problem... Some cases oal was shorter then the (shooting from the hip) 1.760" that i wanted to use as my trim length. Some cases were much longer as well (which isnt a problem). so my question is, what do you do when cases are shorter than you want? Just load em up with a cheap recipes and blast em again in hopes they lengthen? or just set em aside in case you get desperate one day? eta trim length is 1.760" yes it is .223 Regardless of COAL or ogive to case head and where you set it, the 1.760 or less, assures the neck of the case does not bump into the end of the neck relief in the chamber. For correct AR positioning, the only thing that touches is supposed to be case shoulder to conical section in the chamber. There are very few exceptions. http://i255.photobucket.com/albums/hh133/counterclockwisester/bullet_chamber_cutaway-1.jpg you are correct, but i dont think you helped answer the question at hand. what do you do when cases are shorter than you want? Just load em up with a cheap recipes and blast em again in hopes they lengthen? or just set em aside in case you get desperate one day? |
|
Quoted:
what do you do when cases are shorter than you want? Just load em up with a cheap recipes and blast em again in hopes they lengthen? or just set em aside in case you get desperate one day? Set them aside from the spec brass if you are loading for tight tolerance and accuracy. Use them for non-cannelure loads where no crimp is needed. Use them for cold-barrel shots, rough-sighting new optic, plinking, introducing new prospective shooter to hobby, ect... 
|
|
Quoted:
Quoted:
In 223, I trim to 1.755, cases shorter than 1.754 are not used in the batch. Get put in with the non precession cases. Cases longer than 1.756 get trimmed. I seat to mag length. That's how I do it. Are you saying you trim the case so that the cartridge OAL is 2.550 with your chosen bullet seated how you want it? I posted the wrong figures, edited my origional post, and this one too. dryflash3 Ah, OK. What trimmer are you using? My Lee trimmer takes everything to 1.748. |
|
Quoted: Quoted: Quoted: In 223, I trim to 1.755, cases shorter than 1.754 are not used in the batch. Get put in with the non precession cases. Cases longer than 1.756 get trimmed. I seat to mag length. That's how I do it. Are you saying you trim the case so that the cartridge OAL is 2.550 with your chosen bullet seated how you want it? I posted the wrong figures, edited my origional post, and this one too. dryflash3 Ah, OK. What trimmer are you using? My Lee trimmer takes everything to 1.748. Giraud. |
| When I trim my cases I also do the 1.755" for accuracy ammo, for plinking I use 1.750" thenI shoot it until it reaches the 1.755" length than that brass becomes my accuracy ammo brass . I've been using a Lyman manual trimmer to accomplish my trimming but I have a possum hollow trimmer that I am going to try when I get back home. |
|
It seems the whole focus here is neck tension. The .223 has plenty of neck tension when trimmed to "trim" length. The key is consistent neck tension. There is no reason to purposely trim your brass to MAX length. Pick a trim length and trim them all to that length. I say pick one because many trimmers are adjustable and some like the Lee, well you get what you get they tent to vary but are consistent.
Any thing under your target length just use for plinking or whatever. If you are this far in to it I have to ask if you are also matching your brass by brand and or headstamp and are you weight matching them? |
|
Quoted:
It seems the whole focus here is neck tension. The .223 has plenty of neck tension when trimmed to "trim" length. The key is consistent neck tension. There is no reason to purposely trim your brass to MAX length. Pick a trim length and trim them all to that length. I say pick one because many trimmers are adjustable and some like the Lee, well you get what you get they tent to vary but are consistent. Any thing under your target length just use for plinking or whatever. If you are this far in to it I have to ask if you are also matching your brass by brand and or headstamp and are you weight matching them? Yep. Mine does 1.748, or actually 1.7485, which is different from what I've heard of others. It does do it consistently though. |
|
Quoted:
Quoted:
It seems the whole focus here is neck tension. The .223 has plenty of neck tension when trimmed to "trim" length. The key is consistent neck tension. There is no reason to purposely trim your brass to MAX length. Pick a trim length and trim them all to that length. I say pick one because many trimmers are adjustable and some like the Lee, well you get what you get they tent to vary but are consistent. Any thing under your target length just use for plinking or whatever. If you are this far in to it I have to ask if you are also matching your brass by brand and or headstamp and are you weight matching them? Yep. Mine does 1.748, or actually 1.7485, which is different from what I've heard of others. It does do it consistently though. Yeah, I'm pretty sure the cutter is digging into the length rod on mine. It cuts at 1.745" I think a new one is in the not too distant future. |
Armory Sponsor