I’m new to reloading and need a clarification. Working on some 6.5 creedmoor the Lyman book I’m using says case length is 1.920 but under spec it says case trim length is 1.910. All of my cases were between those two numbers is that ok? Or do i need to trim them all to the 1.910?
The trim-to length is a pretty critical measurement. If the case is too long, it can pinch the brass in the chamber and make the brass hold too tight onto the bullet. That’s a dangerous over pressure scenario.
Could you show us a pic of the book you’re looking at or the cartridge you’re using? I’m just seeing conflicting numbers here and want to make sure we get this right.
I’ve never had to trim brass after a first firing. It’s always important to check, but I’ve never needed to trim.
Thank you Jim for replying! I’m not sure how to add photos here
Matt,
Take a pic, save it onto your computer. Then reply to Jim’s message & select the photo button, below, browse to the picture & upload it.
Jim,
This is confusing to me, “I’ve never had to trim brass after a first firing. It’s always important to check, but I’ve never needed to trim.“
I have been looking to get the Frankford Arsenal Platinum Series Case Prep and Trim Center, are you saying that you only use it one time on your brass?
Corey
This is where I’m stuck am I supposed to trim all to 1.910? All of my brass was 1.914-1.918. Or since I’m between the two I’m good?
Each time you shoot, the brass grows longer as it stretches. After the first firing, it normally wouldn’t be over spec. But after the second, third, or fourth, at some point you’ll certainly need to trim it back.
I thought 1.920 is the max length and typically trimmed back to 1.910. My Peterson brass is typically 1.910–1.915 new. The 1.920” allows for some growth/stretching room as I have understood it. If you are under 1.920 you are ok. If you are going after precision trim all to the same length.