Selecting Correct neck die bushing

[M-61]

Would the correct way of selecting a neck die bushing be to measure a loaded round. ( a fired, re-sized and loaded round from the same rifle) Measure the neck diameter of the loaded round and the subtract a number of thousandths from that? If so, how many thousandths should you subtract? Given that number should bushings be ordered to bracket that one dimension for some reason as well as one for the exact size?
This is for a Wilson die. Thanks

 

[jonbearman]

I would buy one to give you about .002 thou neck tension,to get this you would need to go about .003 under because of springback.This is for a custom chamber,now if it is a sporter chamber I would just use a std sizing die due to the excessive neck in the chamber(sloppier).

 

[M-61]

It's for a Savage 12BR in 6.5 x .284
I am getting .291......and that's measuring a dozen reloads all loaded with the same bullet.
I have the die already....so the I the way I understand you I should get a .288
If I am right with this would you just get the one size bushing?
THANKS

 

[jonbearman]

I bought a .287 and a .288. Its a shame you cant measure the chamber to just see what it is.It sounds better than usual with the .291 measurement.Measure the neck after firing.This will tell the story and I will get back to you.

 

[Shynloco]

It's for a Savage 12BR in 6.5 x .284
I am getting .291......and that's measuring a dozen reloads all loaded with the same bullet.
I have the die already....so the I the way I understand you I should get a .288
If I am right with this would you just get the one size bushing?
THANKS

Good Morning Sir C,
What I've been taught is take a reloaded (previously fireformed) casing with a new bullet in it. This assumes you already know the measurement of your chamber so that it produces you a tight chamber fitting. Measure the outside of the neck and subtract .002. There's your .002 neck tension which most seek in Benchrest shooting.

Alex

 

[M-61]

I bought a .287 and a .288. Its a shame you cant measure the chamber to just see what it is.It sounds better than usual with the .291 measurement.Measure the neck after firing.This will tell the story and I will get back to you.

OK...This would be a fired NOT re-sized case...correct? Would this dimension tell me the true size of the chamber MINUS an unknown amount of brass 'spring back'?

 

[jonbearman]

Yes it will give a good indicator.What I am getting at is if the chamber is plain old sammi spec,using the busshings will be a little rougher on the brass as they dont have a slight lead as the brass goes into the die.Now a standard reloading die in the case of say a .296 chamber just for an example,you will be trying to go from .295 or so to .288 which is .008 thou and when using a bushing,you would have to go in .003 steps lets say to get the brass to smoothly enter the bushing and resize then change to the next smaller bushing.I have a .260 shilen barrel that I have settled on a std sizing die as the bushing die is working the heck out of the brass,the std die will resize like butter if lubed correctly with sizing wax or whatever you use. Using s type dies in my opinion are for tighter chambers than std sammi spec chambers.

 

[jcampbellsmith]

It's for a Savage 12BR in 6.5 x .284
I am getting .291......and that's measuring a dozen reloads all loaded with the same bullet.
I have the die already....so the I the way I understand you I should get a .288
If I am right with this would you just get the one size bushing?
THANKS

I've ended up with a set of bushings running from .296 down to .286. This allows me to take a case fired in a std chamber down in two small steps to the required neck tension. The recommendation I've read is not to go down in steps larger than .005 inches. I've some Remington 260 Rem cases on their tenth firing now using this approach. Regards JCS

 

[jonbearman]

You could possibly have someone make you a die to your liking and forget the whole idea of so many bushings.Google die makers and hopefully someone will chime in and make a recommendation to make you a custom die for as little as about 75.00.Whidden gunworks will make you a custom die with or without neck bushings from your reamer drawing or from several fired unsized cases.Clarence Hammonds will do it too and there are many others.

 

[jonbearman]

Call neil jones and harrels as they will make a sweet die for you.