300 WSM, 300 WIN MAG FREEBORN

[tuttlefarm]

I'm confused. Or an idiot! I thought that the short neck of the WM mitigated a longer freebore. You're saying for 210's it's .255 for the WSM & 220 for the WM?

I did that before on another cartridge and was about 100 thou longer than any I had been advised. The level of the empirical guidance here is still of great help.

I was very confused, I fixed it

 

[BOB LEE SWAGGER]

Thanks to all. Matt & Steve a special thanks - I was hoping to avoid being more of a nuisance, and now it's CLEAR. JGS time!

 

[BOB LEE SWAGGER]

I don't think the freebore knows what cartridge is behind it. Should be the same.

The bullet knows what is in front of it.

 

[Terry_M]

I was hoping for numbers to take to a reamer maker. That's all. The title is not WTF is freebore?

Sorry to hurt your feelers, but the question was driven at a point to make sure what you were referring to as "freebore" was the same "freebore" I was taught. .290 is fairly standard for a 300WM.