I'm just starting with a 6.5 with a neck OD of .290. Took great care with brass prep, ready to size. Forster FL 6.5 X 47 stock die (from Forster rep) was to measure .284 which I could use. Turned out to be EXACTLY .2815 in actuality. No go. Redding die marked .285 proved to be true. Redding die marked .284 was 282.5 in reality. No go. New dies, new bushings. This is a variable that adds to the variables!
Real bushing sizes
- Thread starter BOB LEE SWAGGER
- Start date
On the Redding website under FAQ. They say that the only way to verify the bushing opening diameter is with standard plug gauges. Micrometers and calipers are not accurate for this purpose. Micrometers have a flat edge that doesn't conform to a circular surface.
http://www.redding-reloading.com/tech-line-a-tips-faqs/136-bush-size-quest
http://www.redding-reloading.com/tech-line-a-tips-faqs/136-bush-size-quest
All the measurements were from the OD of the sized brass, bushings & FL sizer did not size to the number on each.
The spring back of the brass can make some difference the neck thickness can be different. Forster and Redding they have a pull through button on the de priming stem. Till you take the button off you cant say what
the bushing is doing. Larry
the bushing is doing. Larry
Dusty Stevens
Shiner
Go by a local machine shop and let them measure it with a pin gauge. Id bet its exactly spot on
You should be able to get accurate measurements using a neck wall thickness measuring tool ie. the Sinclair model.
You need to just size the cases and shoot at a long distance target. Try several bushing sizes. You have to have an exceptional rifle and very good shooting skills to see any difference.
The entire Redding response:
While it is possible that a Bushing's inside diameter is incorrect, it is very unlikely. In fact, our bushings are good enough that some folks use our bushings as an "ID standard" to set inside diameter measuring instruments. We Sunnen hone all of our bushings to a tolerance of -.0005 inch. (For example, a .333 diameter bushing will measure no larger than .3330 and no smaller than .3325, usually about .3327 to .3328).
It is very common for reloaders to measure the inside diameter of their bushing with a dial or digital caliper. Because the inside surface of a bushing is circular, the flat surfaces on the inside jaws of a caliper cannot be used to obtain accurate measurements (known as bridging). Not to mention the fact that even the best calipers are only accurate to +/- .001. Using precision ground I.D. Plug Gauges is the only way to accurately measure the I.D. of our Bushings.
Likewise, one cannot measure the neck of a "sized" piece of brass to determine a bushing's size. Because of springback and the metallurgic properties of brass, the neck of a sized case will not reflect the exact inside diameter of the bushing that it was sized in. Because of the case differences, both new and as they work harden with age, most serious handloaders end up with several bushings to control bullet tension (bullet pull) closely.
As always, Redding is happy to examine a bushing that appears defective. Should we find that the bushing's inside diameter is incorrect, it will be replaced under our Warranty with no questions asked. Please contact us before mailing any product to us for warranty inspection so that we can be sure that we are solving the difficulty you are having.
The entire Redding response:
While it is possible that a Bushing's inside diameter is incorrect, it is very unlikely. In fact, our bushings are good enough that some folks use our bushings as an "ID standard" to set inside diameter measuring instruments. We Sunnen hone all of our bushings to a tolerance of -.0005 inch. (For example, a .333 diameter bushing will measure no larger than .3330 and no smaller than .3325, usually about .3327 to .3328).
It is very common for reloaders to measure the inside diameter of their bushing with a dial or digital caliper. Because the inside surface of a bushing is circular, the flat surfaces on the inside jaws of a caliper cannot be used to obtain accurate measurements (known as bridging). Not to mention the fact that even the best calipers are only accurate to +/- .001. Using precision ground I.D. Plug Gauges is the only way to accurately measure the I.D. of our Bushings.
Likewise, one cannot measure the neck of a "sized" piece of brass to determine a bushing's size. Because of springback and the metallurgic properties of brass, the neck of a sized case will not reflect the exact inside diameter of the bushing that it was sized in. Because of the case differences, both new and as they work harden with age, most serious handloaders end up with several bushings to control bullet tension (bullet pull) closely.
As always, Redding is happy to examine a bushing that appears defective. Should we find that the bushing's inside diameter is incorrect, it will be replaced under our Warranty with no questions asked. Please contact us before mailing any product to us for warranty inspection so that we can be sure that we are solving the difficulty you are having.
No button used. Springback would cause a larger diameter of measured OD neck. Redding .284 bushing is sizing neck to .2825.
I favor Redding above all others, maybe this is just an aberration.
I favor Redding above all others, maybe this is just an aberration.
243 winxb, that MIGHT be part of it. I have turned the necks for a loaded diameter of .286". After firing they are .2895". I still don't know why the .284 takes it to .2825".
All of your responses are helpful. Thanks.
All of your responses are helpful. Thanks.
I have noticed this issue with my 6.5 Creedmoor and 308 Win using bushing dies. On my Creedmoor, when I use a 289 bushing it sizes to the correct diameter, but if I use a 288 bushing, it will size to .286". Trying to size to much in one step will cause this issue. I have found that sizing down more than 0.005" in one step will result in a case neck that is smaller than the bushing size used. On my 308 Win, a fired case neck measures .343", so I have to size first with a 339 bushing and then with a 336 bushing. If I size with the 336 bushing only, I get a case neck OD of .333"
BCoates, I appreciate that. That is probably the issue!
I never seem to be able to get good runout with bushing dies. I always seem to end up buying a forster and sending it in to have the neck honed out to the dia. I want and use it without the expander. I get the desired sizing and low runout.
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