Case OAL

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AKD

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Case OAL. Not bullet oal, just the brass.

I'm sitting at the loading bench right now trimming some necks.

Anyone ever play around with there case oal or know any info on how to determine the best neck length for a rifle?

The max length in a .308 is 2.015. I usually keep mine at 2.005..... Why? Mostly.. I don't know just the # I use.
I once did a test by cutting 5 rds to 2.000, fired them than trimmed them until the neck was perfectly flat. Never really made a difference.

Best I can come up with is maby if it's to long will it effect head space? What if it's to short?


I have 10 rds here at random lengths but I'll be shooting just about all this ammo at 1000y. Not really the best data for such a minor tweak in the form of data I find.

Anyway so ya, what kinda info do some of you have on case oal?
 
Not exactly what you are after, but I sized some .308 Lapua for my 7mm-08.

I am at approx 2.012"- 2.013". 2.025" is published minimum.

They started at 2.005" , I am not finding any issues and they have a ways to stretch yet to meet the minimum. Personally I think it is the least critical thing to worry about.

I will try to note some differences once I have confirmed my final target load and have a concrete and consistent load, maybe do some testing at max length and my under length brass.

I am no expert, this is just what I am experiencing.
Just need more powder!!
 
about all i know, is if the Max is exceded the neck will stretch out into the throat and can cause pressure issues.. but reall that will vary by chamber...

iv shot my 308, with cases at 2.0, 2.005 and 2.010, i found absolutly no differance in accuracy for my level of shooting.

pbout the only differance i could tell, is that in the shorter cases, when stretching the bullet way out to be just off the lands, the bullet seating wasnt as concentric as it was with the longer cases, my best guess is that there was less contact between the neck and the bullet, but once again the variations were minimal
 
I agree it's gota be one of the smaller things to worry about. I gota few different loads done for this rifle, one I'm using right now is the oldest and best. Has produced .18 moa @300 and an average of .3-.4 moa.

Like I said I never really found a difference but at the same time I've never tested max length - min length either.
 
haha i hear that, i dont mind trimming so much, even with my rcbs hand trimmer i can do 100 casses in about 5 min, but the chamfuring and deburing part, ugh dont get me started!
 
For my hunting loads that will do 1/2 MOA , I only trim if above the max of 2.035" anything under and I leave it alone, so far works for that load. There is some differences of .020" in case OAL, not much effect on that particular load or inaccuracy.

As for U.Monkey's deburring issue, the boredom is usually set off by some type of recorded DVD concert of my favorite music!!
 
oh man the hand cramps are the worst! im glad i have the case prep center raher then that stupid hand tool haha, but i still get hand cramps especially for the small casses, i think for the calibers i shoot the most im goin to invest in those trimmmer, chamfuring / deburing in one cutter head things... seems like it would be the cats ass


i cant help but notice this thread got derailed to almost the point of my precission naow thread :/
 
lol ya. Hey on that note I actually saw a train wreck not to long ago eh! Out driving home with that person who won't let me buy a .338 (aka wife) and we came up on a train that derailed !! Just a cargo thank god, but pretty neat still.
 
cool, get any pics?

wife you say? im SMRT enough to stay single, then i can do what i want, granted i look like an ex con and dont own nice clothes cuz i dont know how to fend for my self in this city nonsense, but i have lots of cool toys lol
 
no unfortanly, got a little caught up in the holey crap moment.

lol STAY SINGLE!!!! Jk they have good points. Like for example, no more peanut butter sandwitches and cereal for supper haha.
 
Done ! Thease rounds are complete ! For tonight anyway.

Time to hit the sack now. This thread will probally get deleated when they see how off topic it is :p
 
@Kelly Timoffee, warning - published max case length for .308 Win is 2.015". While it is true that chambers will be cut to safely allow the firing of a case longer than this, the moment you exceed 2.015" you are in uncharted territory and you are a test pilot. You can do this safely if you take a chamber case or otherwise determine the actual neck dimensions of your specific chamber. But unless a shooter wants to do this, one should never allow cases to grow beyond the published length.

@AKD case length will not affect headspace at all. Headspace is determined (in a bottleneck cartridge like the .308 Win) by the distance from the base of the case to the shoulder of the case.

An overly long case might be difficult or impossible to chamber (what happens is the case mouth is touching the front of the area in the chamber that is there to accommodate). If you are able to chamber such a round you will be "pinching" the bullet with the case mouth, which will increase pressure when the round fires (perhaps a bit, or perhaps a dangerous amount)

I usually trim my .308 cases to around 2.000" (which is a bit shorter than the recommended trim-to length of 2.005"). For the level of accuracy I achieve (a minute of angle at 1000 yards and half a minute of angle at 100 yards), I have never noticed much if any connection between case length (in the range of 2.000" to 2.015"). If you are interested in better levels of accuracy (e.g. benchrest or very serious F-Class), this and a whole lot of other factors might matter (or they might not..)
 
I agree 100% , But I wasn't loading .308, I sized 7mm-08 down from .308, so it's all good. I never go longer than puslished maximum, which for the 7mm-08 is 2.035", I am also running below specified minmum for that caliber, and with no adverse effects on accuracy.


rnbra-shooter said:
@Kelly Timoffee, warning - published max case length for .308 Win is 2.015". While it is true that chambers will be cut to safely allow the firing of a case longer than this, the moment you exceed 2.015" you are in uncharted territory and you are a test pilot. You can do this safely if you take a chamber case or otherwise determine the actual neck dimensions of your specific chamber. But unless a shooter wants to do this, one should never allow cases to grow beyond the published length.

I
Click to expand...
 
Sinclairs (and probably others) sell "chamber length gauges, which are a calibre-specific button which is fitted into a brass case which has some of the neck trimmed away. This case is then chambered and you have an accurate measurement of chamber length. Thus, you know how much to let your brass grow and when to trim.

Elementary to many I'm sure, but thought I would pass it along........
 
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