Seating depth mystery

Indian7953 · Nov 13, 2019

My 7mm Rem mag's seating depth seams to have changed. My last reloads, 143 ELDX, every thing exactly measures the same, but has resistance closing the bolt and almost impossible to remove the unfired cartridge. However the fired case ejects easily and re-chambers with no force. My seating depth @ ojive is still the same, same box of bullets, etc. What is going on? Here is a picture of my loaded cartridge, the fine ring is made by my ogive gauge, the wide rough ring is behind the lands. What is causing the scraping?

Indian7953 · Nov 13, 2019

Sorry, 162 ELDX BULLETS

Indian7953 · Nov 13, 2019

Indian7953 said:
Sorry, 162 ELDX BULLETS

The fine ring is from my ojive gauge, the rough wide ring is .020" off the lands. What is causing the scraping?

nt7332 · Nov 13, 2019

I am assuming that case in pic has been chambered and ejected? You could have carbon build up. I would do a good cleaning and see if that helps the issue paying close attention to cleaning right where throat starts.

Lowedown · Nov 13, 2019

my first thoughts while reading this were to wonder if the cases needed trimmed, or hadn't been sized enough. However, the picture kinda has me stumped as well, unless those bullets are bigger than .284? I'm curious to see what others think!

rsmithsr · Nov 13, 2019

it could be carbon but looks too far forward of the neck. I would clean with a quality carbon buster and try again. also try remeasuring the seating depth of the chamber. full dia contact could just be a worn throat....or carbon.

nt7332 said:
I am assuming that case in pic has been chambered and ejected? You could have carbon build up. I would do a good cleaning and see if that helps the issue paying close attention to cleaning right where throat starts.

Indian7953 · Nov 13, 2019

nt7332 said:
I am assuming that case in pic has been chambered and ejected? You could have carbon build up. I would do a good cleaning and see if that helps the issue paying close attention to cleaning right where throat starts.

Yes sooted, chambered and ejected.

Indian7953 · Nov 13, 2019

Lowedown said:
my first thoughts while reading this were to wonder if the cases needed trimmed, or hadn't been sized enough. However, the picture kinda has me stumped as well, unless those bullets are bigger than .284? I'm curious to see what others think!

Indian7953 · Nov 13, 2019

Case length is perfect. .284" checked.

Indian7953 · Nov 13, 2019

Indian7953 said:
Case length is perfect. .284" checked.

Bullet dia. Resized correctly.

JTB · Nov 13, 2019

Quick question. Does that scraping go all the way around when chambered or only on one side?

sturner · Nov 13, 2019

May need to bump the shoulder back

FURMAN · Nov 13, 2019

It looks like a carbon ring. I do agree it looks a little far forward. I would get some Boretech C4, run some wet patches and let set ten minutes then more wet patches and scrub the throat with a nylon brush. Repeat at least once and check again.

Indian7953 · Nov 13, 2019

JTB said:
Quick question. Does that scraping go all the way around when chambered or only on one side?

All the way around

Seating depth mystery

Indian7953

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