Thread: See separation?

Originally Posted by Longranger

No the chamber has a step from the neck to the freebore and there is no way the neck can be near the lands in a bottle neck case...could happen with pistol brass though.

Don't know what would happen but I guess if the case needs to gain some length there would be an adverse reaction...yes that is why I questioned the "shiny" end of the neck...if it is too long there should have been some difficulty loading the round into the breech and if so the reason should be determined....as previously mentioned this exercise should be performed when full length sizing brass AND with loaded rounds to ensure the projectile length is appropriate AND the neck has clearance in the chamber....no more accidents so don't do this after a beer at dinner time....THE FIRING PIN MUST BE OUT AND JUST THE BOLT BODY IN THE ACTION..... Check the overall neck OD of a loaded round and compare with an unsized fire-formed case which will be approx 0.001" smaller than the chamber.....the loaded dimension difference should be at LEAST the fired case OD (this dim is for highly skilled reloaders capable of accurately measuring and maintaining that dim) up to some factory chambers your guess, but I would suggest no more than 0.010" ie 0.004" on my SAUM

However I and still confused about how the neck came to be on the projectile...was it before firing or can I ask..... after firing....?

One should always check max length of the case neck portion of the chamber with the appropriate gauge to know what max trim length should be......how do you know what to trim too otherwise....?

Let us not forget that every chamber reamer has a different result...the same reamer in the hands of different operators will give different results because of barrel steel, lubrication, feed speeds, and or not polishing.....it is up to the reloader to make their brass fit that chamber accurately and in order to do so they must determine certain critical dimensions, and maintain them....enough from me....!

I had an issue with a 6.5x57AI and Allen Carr did the above to show me excessive head space, it was way out, he had to manufacture and insert some sort of brass collar from memory shot great afterwards. Turkish intermediate length Mauser.