Trimming brass

[billbmcleod]

Would it be safe to say that a bottle neck rifle case will be longer after sizing.I have a bunch of 300WSM cases that I wanted to de-prime trim to a length a few thou under recommended trim length, and chamfer so that when I get my dies I will be closer to getting started.
Just trying to do some prep work ahead of time
Any comments other than wait till Ihave the dies

 

[yomomma]

Trim after sizing.

 

[GreenBob]

x2 - Trimming before sizing is going against conventional wisdom. The case will grow in length as it is FL sized. After it has grown to its full length via the sizing process is when you should trim it, not before.

Trim after sizing.

 

[yomomma]

x2 - Trimming before sizing is going against conventional wisdom. The case will grow in length as it is FL sized. After it has grown to its full length via the sizing process is when you should trim it, not before.

And...cases will not all change the same amount when being sized Consistency is always key

 

[billbmcleod]

I agree 100 percent that you should trim after sizing. I was just thinking of getting a head start on things. If I don't trimtoomuch

 

[kawicrash]

The size of the pilots are made for a resized neck as well.

 

[billbmcleod]

OK I will wait till Iget the dies.
This is why I love this site. You get enough opinions to make a reasonably educated decision.
Thanks to all.

 

[mark222]

The size of the pilots are made for a resized neck as well.

Another good point. Just wait and trim after resizing.

 

[rosconow]

Trim after sizing. No need to put the cart before the horse on this one.... buying ammo before you buy a gun on the other hand...

 

[Boomer686]

Yep you should always trim AFTER resizing.

 

[GreenBob]

the only reason I still float around here after 10+ years.

OK I will wait till Iget the dies.
This is why I love this site. You get enough opinions to make a reasonably educated decision.
Thanks to all.