300 RUM Load Advice

[Double Dropper]

Black ring at the neck junction. Neck sized once fired brass (Nosler) factory chamber, 91.5 grains of Retumbo, neck sized only, is this too much neck sizing (sized down too far into the shoulder) or is the neck sizing die ( fixed Redding) sizing too much?

 

[QuietTexan]

Looks about like mine do? Just a dirty neck, if it's not shooting down the shoulders and case body IMO you're fine.

 

[Double Dropper]

LOL was thinking the same thing....just wondering if my die was sizing the neck too much. Nosler Brass, the once fired neck is .341", the sized neck is .334.5, and a sized case with a 200 grain Nosler is .336" I will give the rifle a bath first.

 

[Double Dropper]

I have heard Retumbo is dirty?

 

[cohunt]

They must have used the Eurasian collared rum reamer on your rifle

 

[Double Dropper]

Maybe

 

[K.E.C. Darkside]

Mine do the same thing. Just what the Texan said. Although I only neck size every other sizing, full length every other sizing. I get as many as 8 reloads out of my medium loaded brass. Maybe 4-5 out of my hot rods before the primer pocket loosen up. Just what I do.

 

[K.E.C. Darkside]

Do you have a case gauge to check your max length. I noticed you asked about to much sizing. I use a max case gauge.

 

[Double Dropper]

Do you have a case gauge to check your max length. I noticed you asked about to much sizing. I use a max case gauge.

Length is good new brass was at minimum length