So I am curious about that nice piece of brass.....

[Jedabug92]

so the Lymans 49th says trim .308 to 2.005....but what do yall trim it to? i have alot sitting on 2.010 to 2.020......does the .015 make THAT big of a diiference??

side note, ill be back for to 100yd 5 shot groups challenge soon

 

[Sanford]

I trim to 2.000 when it exceeds 2.015 ... SAAMI spec is 1.995 to 2.015 for whatever that might be worth.

 

[Jedabug92]

So under 2.015?

Sent from the Armory

 

[Calamity Jake]

Yap trim to 2.000 then neck size only after fire form, it'll be a while before you will need to trim again.

 

[Jedabug92]

Yap trim to 2.000 then neck size only after fire form, it'll be a while before you will need to trim again.

Trim then size? I thought it was the other way around

Sent from the Armory

 

[Oklahomabassin]

Trim then size? I thought it was the other way around

Sent from the Armory

I believe he means after initial size and trim, fire in your gun. Then only neck size the brass, rather then full length size. The neck sizing slows the lengthening of the brass.

 

[Jedabug92]

I believe he means after initial size and trim, fire in your gun. Then only neck size the brass, rather then full length size. The neck sizing slows the lengthening of the brass.

Oooooohhh

Sent from the Armory

 

[Blitzfike]

Also, having all the brass trimmed to the same length makes crimping much easier. If your cases are different lengths its easy to buckle the shoulder when crimping a long one. If you aren't crimping then no problem.

 

[Jedabug92]

Also, having all the brass trimmed to the same length makes crimping much easier. If your cases are different lengths its easy to buckle the shoulder when crimping a long one. If you aren't crimping then no problem.

I only crimp the semi auto rounds
This is for a bolt action

Sent from the Armory

 

[swampratt]

I trim to 2.008 each time after I resize the case.
But I am not sure if this really makes a difference at close range in non crimped brass.
Scroll down to post #12 in this link. That is 11 shots fired and no case neck trimming. in fact no primer pocket cleaning and only cleaning the outside of the case with 0000 steel wool and brushing the neck ID with a rifle cleaning brush by hand.

Cases were FLS and the load was not measured on a scale. just filled a brass case with powder and poured it in and loaded.

The flier in the group was from case lube on powder, I forgot to clean the inside of the neck before inserting powder. Made a flier.
the link. 100 yards
https://www.okshooters.com/showthread.php?208482-how-many-licks-does-it-take