question about trimming with a giraud

[clinto]

I have a newbie question for yall. Should new brass be fire formed in my chamber before trimming with a giraud trimmer? Or is it ok just to full length size the new brass then trim?

It seems like I should do something to get the shoulders all the same before trimming.

 

[MitchAlsup]

Re: question about trimming with a giraud

You are correct in assuming that you want everything in the case correct before starting to load the case. This gives you 2 choices; Size the case, or Measure everything. For a lot of people its simply easier to size the case. The only real exception is Lapua brass, where all you really need to do is make sure the neck is round.

Me, personally, I trim the case necks to length between the first sizing bushing and the second sizing bushing. This puts the neck small enough for the trimmer to run chatter free, but still enables easy ingress and egress. I then chamfer and deburr, run a primer pocket uniformer, and, once only, run a flash hole reamer. The overall procedure is known as Match Preparation of the brass.

 

[ChadTRG42]

Re: question about trimming with a giraud

I normally don't FL size virgin brass. If the necks need cleaning up, then I'll run it over the expender ball. Just chamfer the inside of the neck and you'll be good. Trim them when they get longer than spec after a few firings, or til it touches the end of your chamber.

 

[Hunt]

Re: question about trimming with a giraud

I never trimmed either on new brass until I bought some new uncrimped LC09 brass from Midway. After resizing, it was greater than max length....I check them all now and trim if need, even when new.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ChadTRG42</div><div class="ubbcode-body">I normally don't FL size virgin brass. If the necks need cleaning up, then I'll run it over the expender ball. Just chamfer the inside of the neck and you'll be good. Trim them when they get longer than spec after a few firings, or til it touches the end of your chamber. </div></div>