Neck Sizing Bushing Die, Which One?

[Hotburn76]

I Have a 204 and recently just bought a RCBS neck sizer die that is out of spec IMO and will need to be sent back, the inside measures at .2315 with a hand lathed pin type gauge. Am thinking about getting a Redding bushing die, but unsure of which bushing to get since I am not sure of how much spring back and neck tension I need to allow for. I have a factory chamber so was just going to target for necks with a thickness of .012 From what I have read, and you guys feel free to set me straight, just please give me answers if I am wrong. But anyways, I think that if my bullet is .204, and I will have necks of .012 and neck tension of .002 This so far puts me at a bushing of .226 with out any spring back figured in, what size bushing should I get for .012 necks? how much spring back do I need or do I need to figure that in? Have been doing a lot of reading on this, but just want to make sure I am understanding this right before I buy another die.

Thanks, Jason

 

[284driver]

.204+,.012x2)= .228
so, a .225 should be good for you. Have you measured a loaded round? Generally you want to go .003 smaller to get .002 neck tension. Redding bushing dies are nice. The Type S neck die set is the way to go, IMO. It includes a body die for setting the shoulder back should the bolt stick after several firings.

Good Luck

 

[birddog]

I have the same question. How do I know what my neck thickness is on the Nosler brass I ordered? I don't really have a tool to measure it with. Is .012" standard for neck thickness?

thanks,

Birddog

 

[billmo]

birddog, you really need a tool to measure the neck thickness with but, from my experience with Nosler brass it is closer to .015 than .012 or .013. I hope this helps. Bill

 

[Silverfox]

Birddog--Mitutoyo makes a relatively inexpensive tubing mic that works real good for measuring neck thickness on brass. It IS NOT DIGITAL, as those digital mics run in the $300 and more range. The one I purchased has the capability of getting into the necks on my .17 Remington brass.

 

[Hotburn76]

Thanks guys! I will look into the .225 size when I have the cash to get a new die, will go with Redding, seems like a lot of guys on this site like them.

Also, is neck tension, and spring back the same thing? I hear the phrase .002 neck tension, and to my understanding that is the case mouth should be .002 smaller then a bullet to allow for tension on the bullet. But then hear of guys talking about the brass spring back. is this only a large caliber problem, or a small caliber one? Do I need to worry about spring back? Thought maybe it was a certain brand of brass that had that issue? A .225 die give me .002 tension and .001 spring back if I understand it right, is that enough, to much, is this a issue that I need to worry about?

 

[birddog]

Thanks for the suggestion on the neck micrometer from Midway. Looks like one will be in my future as I've purchased a redding competition die set, but haven't purchased any neck bushings yet as I haven't figured out which size to order.

Birddog

 

[birddog]

gunamonth-

I have a caliper, but not a micrometer. What would you suggest for a reasonably priced micrometer to measure my necks with the bullets inserted into them?

thanks,

birddog