Possible new build

[stw]

I'm building a 300 prc now I had to send back the bottom metal and the 2 mags. I bought the bottom metal and mag's. Size were 3.715 the 212 gr. Fit and the 225 don't fit had to send back and get the 3.850 length of mags and bottom metal so the factory 225  and 230  hand loads would fit.

[b23]

I generally like to have the bullet diameter of bearing surface in the neck so using that with a 215 Berger, you should be well under 3.600 with both the 300 PRC or 30 Nosler.  I don't think either case has enough capacity to warrant anything heavier than a 215 so that's why I referenced the 215's.

Does that keep the bullet away from the donut area on the prc?

I've had and currently have many different cartridges I load for, both mild and hot rod, I have never ever had an issue with donuts forming in the neck.  I know what they are and I hear people talk about them, I tend to think more talk about it than actually have experienced the problem, but I've never had any problem with them forming. 

[jjhunter]

I generally like to have the bullet diameter of bearing surface in the neck so using that with a 215 Berger, you should be well under 3.600 with both the 300 PRC or 30 Nosler.  I don't think either case has enough capacity to warrant anything heavier than a 215 so that's why I referenced the 215's.

Does that keep the bullet away from the donut area on the prc?

I've had and currently have many different cartridges I load for, both mild and hot rod, I have never ever had an issue with donuts forming in the neck.  I know what they are and I hear people talk about them, I tend to think more talk about it than actually have experienced the problem, but I've never had any problem with them forming.

Agree.

[Magnum_Willys]

I know its just a good rule of thumb to not seat bearing surface  past the neck - shoulder junction for the best neck tension consistency.   

[b23]

I know its just a good rule of thumb to not seat bearing surface  past the neck - shoulder junction for the best neck tension consistency.

Have you ever had trouble with donuts forming?

[jasnt]

I know its just a good rule of thumb to not seat bearing surface  past the neck - shoulder junction for the best neck tension consistency.

Have you ever had trouble with donuts forming?

i have.  Was same lot of Norma 243 brass on its 3rd barrel

[Magnum_Willys]

I know its just a good rule of thumb to not seat bearing surface  past the neck - shoulder junction for the best neck tension consistency.

Have you ever had trouble with donuts forming?

Yes on 338-378 when full sizing I get a donut that has to be drilled out or you feel the big resistance when  seating bullet as it hits that junction.    I think full sizing with certain dies causes it.  I have tried several dies including a body die same issue.   If your die - chamber match is off you have to bump too far to fit in chamber causes it too.   

If you can get by with Neck sizing or just .002 bump probably won’t ever get a donut. 

[jasnt]

I have gotten the donut using bushing neck dies with out an expander ball.  Put the expander back on and stopped getting the donuts