300wsm chamber

[300rumfan]

I have a 300wsm chamber with a new pt&g reamer. It chambers new brass just fine, it will also chamber once fired brass. However brass resized in my body die is extremely tight. I don't understand because the resized brass measures smaller at the base, center and shoulder. The shoulder is also pushed back 2 thousandths. What am I missing?? And how do I fix it?

 

[Raythemanroe]

Have you trimmed the brass ten thousandths shy? Also Forster makes a nice bump bushing neck die..

 

[300rumfan]

I haven't trimmed the brass but I will. However resized brass measures 1 thousandth longer than one fired....would that cause it?

 

[Raythemanroe]

Maybe anneal and resize then trim to 2.850 and chamfer..Then give it another go

 

[X Ring Accuracy]

As posted, trim them short. Some crud or whatever could be hanging you up right at the end of the neck where it hits the chamber. I like my brass a smudge short. I also like them a little short so maybe the next cycle I don't have to trim them, LOL I hate trimming brass.

 

[Erik Cortina]

Try bumping the shoulder more and see if it chambers easier.

 

[gotcha]

Bingo!....... Though you may need to Mill your shell holder a bit to get that extra thou or two.

 

[X Ring Accuracy]

I didn't know he had a mill, you are spot on with the bump. I overlooked that 8)

 

[Erik Cortina]

Turn shell holder upside down on 400 grit sand paper and move it in a figure 8 motion on a flat surface. You can shave a few .001" easily.