Chamber dimensiond

[Rolly]

Chamber dimensions
Will someone please post a photo of a lead slug showing the various places in a bullet dimension?
For example. Let’s say I make a chamber cast or chamber pound and end up with a piece of metal reflecting the internal dimensions of my chamber. What is the throat? What is the leade? What are the lands and groves, etc? I understand that lead bullets shoot best if their dimensions match the throat, but where exactly is it on a lead slug or casting? Visuals will always help me to understand! Please and thanks for your indulgence.
Rolly

[BK7saum]

That information is usually in the front of a reloading manual. My speer and hornady manuals have diagrams and pictures showing this information.

Sorry that I don't have something handy to illustrate those items at the moment.

[K43]

Google "chamber throat" and click on the "images" tab. Much quicker than trying to esplen it.

[charlie b]

https://en.wikipedia.org/wiki/Freebore

Some chambers will have no freebore and some have neither leade nor freebore.

[HWooldridge]

Accurate Molds has a lot of pictures and explanations. https://accuratemolds.com/

[Nobade]

Going to the SAAMI web site and studying the various chamber drawings can be very educational. Also somewhat of a history lesson, as you can easily see how chambers have changed over the years and what a modern accuracy type chamber looks like compared to what was normal 100 years ago.

[JonB_in_Glencoe]

As Nobade said, go to SAAMI.
https://saami.org/technical-information/cartridge-chamber-drawings/
,
if you are wanting to know the relationship of a given chamber to a given boolit...that is something you have to imagine in your mind. For bolt action rifles, you want a boolit nose to 'kiss' the leade of the chamber...this will likely provide the most possible square launch. This is also dependent on a square seating of the boolit into the case. Do you check for runout? I prefer a seating die like the Forster BR die for seating cast boolits. While I like Lee dies in general, especially the collet sizer and collect crimp, for most things, Lee's rifle seating dies are the worst of any brand I've used, and allow for too much floppy floppy of a cast boolit during seating, and depending on meplay, that can compound the issue.