I am using rcbs gold medal neck sizer dies.I have about 100 cases that have shot throught my sps varmit m700 that I am trying to reload. After I tumble my cases so they are completely clean I resize the neck,prime,powder etc. I seat the bullet and have about 7 to 10 thousands of runout on average. If I reload 10 I might get lucky and have one that is around 2 thousands out.I ream the neck inside and out to help the case go into the sizing bushing and help the bullet seat.My bushing size in .332 . I measured my brass so I believe that that the bushing is correct. Does anyone have any idea what is doing this and could a bushing to small do it? I have a standard rcbs full length resizer die kit that I can resize my brass in then use my gold medal seater to seat the bullet and it is about 3 to 4 thousands out. I can take me gold medal resizer and resize my brass then use the standerd seater to seat the bullet and its still a few thousands out.If I just use my standard dies to resize and seat I have less than 1 thousand of runout.I did this to see if my gold medal sizer or seater was defective(to try to isolate which one was giving me problems) but it looks like im getting error from both.I honestly believe the dies are ok and its just something im doing or not doing.Whats up with this? Thanks for the help!
Excessive runout .308 rcbs gold medal dies
- Thread starter 87 octane
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Re: Excessive runout .308 rcbs gold medal dies
"I honestly believe the dies are ok and its just something im doing or not doing.Whats up with this? Thanks for the help!"
I honestly believe you have found why so many of us say to use Forster BR or Redding Competition dies. Sorry. They do resell on eBay at really high prices tho.
"I honestly believe the dies are ok and its just something im doing or not doing.Whats up with this? Thanks for the help!"
I honestly believe you have found why so many of us say to use Forster BR or Redding Competition dies. Sorry. They do resell on eBay at really high prices tho.
Re: Excessive runout .308 rcbs gold medal dies
Your process is inducing the runout, I'm guessing fire case diameter of .343 or bigger, your sizing down too much at once, I size down in no more than .004 at at time, use only Imperial Sizing wax, brush out the inside of the necks, keep the press dies and shell holder clean, seat half way stop and rotate the case 90 and finish it off, also what tool are you using to measure runout, check your fired brass, then check it after resizing, then seating
Your process is inducing the runout, I'm guessing fire case diameter of .343 or bigger, your sizing down too much at once, I size down in no more than .004 at at time, use only Imperial Sizing wax, brush out the inside of the necks, keep the press dies and shell holder clean, seat half way stop and rotate the case 90 and finish it off, also what tool are you using to measure runout, check your fired brass, then check it after resizing, then seating
Re: Excessive runout .308 rcbs gold medal dies
Thanks for the info.I must of overlooked sizing down in steps in the instructions but that does make sense.I am keeping my dies clean and im using the the hornady concentricity guage to check the runout.The only problem is you have to have a bullet in the case to use it so I am going to buy one like the rcbs case master that will allow me to check just the case runout or consistancy before I seat the bullet.
Thanks for the info.I must of overlooked sizing down in steps in the instructions but that does make sense.I am keeping my dies clean and im using the the hornady concentricity guage to check the runout.The only problem is you have to have a bullet in the case to use it so I am going to buy one like the rcbs case master that will allow me to check just the case runout or consistancy before I seat the bullet.
Re: Excessive runout .308 rcbs gold medal dies
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 427Cobra</div><div class="ubbcode-body">Your process is inducing the runout </div></div>
I agree 100%.
Also, you can ensure your dies are true on your press by a few techniques. Realizing how coarse the treading is on a die and locknut, you can imagine the issues you can have getting them true. You can purchase a machined washer, with your sizing die adjusted to achieve proper sizing of the brass, lower the press ram and place the washer on the shell holder or base of the press ram and base of sizing die. While applying pressure on the press handle, loosen the lock nut on the die and re-tighten while applying constant pressure. What you are doing is ensuring the die is true to the press and case axis while you jam the lock nut into place.
Perform the same as above on all your dies and see what happens. Note; it helps to have a concentricity gauge for a before and after.
Kirk R
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 427Cobra</div><div class="ubbcode-body">Your process is inducing the runout </div></div>
I agree 100%.
Also, you can ensure your dies are true on your press by a few techniques. Realizing how coarse the treading is on a die and locknut, you can imagine the issues you can have getting them true. You can purchase a machined washer, with your sizing die adjusted to achieve proper sizing of the brass, lower the press ram and place the washer on the shell holder or base of the press ram and base of sizing die. While applying pressure on the press handle, loosen the lock nut on the die and re-tighten while applying constant pressure. What you are doing is ensuring the die is true to the press and case axis while you jam the lock nut into place.
Perform the same as above on all your dies and see what happens. Note; it helps to have a concentricity gauge for a before and after.
Kirk R
Re: Excessive runout .308 rcbs gold medal dies
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Fuzzball</div><div class="ubbcode-body">"I honestly believe the dies are ok and its just something im doing or not doing.Whats up with this? Thanks for the help!"
I honestly believe you have found why so many of us say to use Forster BR or Redding Competition dies. Sorry. They do resell on eBay at really high prices tho. </div></div>
Totally agree
I started with RCBS Competition dies and my runout was bad. I switched to Redding Competition and the results are MUCH better.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Fuzzball</div><div class="ubbcode-body">"I honestly believe the dies are ok and its just something im doing or not doing.Whats up with this? Thanks for the help!"
I honestly believe you have found why so many of us say to use Forster BR or Redding Competition dies. Sorry. They do resell on eBay at really high prices tho. </div></div>
Totally agree
I started with RCBS Competition dies and my runout was bad. I switched to Redding Competition and the results are MUCH better.
Re: Excessive runout .308 rcbs gold medal dies
Thanks for the tips and I will let yall know what happens. If I size down in steps how can I ensure that every time I change the sizing bushing(untill I get down to my final size)that I will be sizing down to the same exact place on the neck?
Thanks for the tips and I will let yall know what happens. If I size down in steps how can I ensure that every time I change the sizing bushing(untill I get down to my final size)that I will be sizing down to the same exact place on the neck?
Re: Excessive runout .308 rcbs gold medal dies
JP find somebody local who has a Sinclair NECO or RCBS concentricity gage, I had a Hornady, I never trusted it, my Sinclair would read zero, the Hornady .005 on the same round, I sold it, lets make sure your tool is GTG before we attack the process, saves money in the long run.
JP find somebody local who has a Sinclair NECO or RCBS concentricity gage, I had a Hornady, I never trusted it, my Sinclair would read zero, the Hornady .005 on the same round, I sold it, lets make sure your tool is GTG before we attack the process, saves money in the long run.
Re: Excessive runout .308 rcbs gold medal dies
"If I just use my standard dies to resize and seat I have less than 1 thousand of runout."
So, your stantard dies do a much better job than the much more costly die set and the problem is supposed to be you need a different sizer? Interesting conclusions .... ??
Seems if you sell your GM dies you lose nothing and no dies are likely to do any better than your standard die set. ??
"If I just use my standard dies to resize and seat I have less than 1 thousand of runout."
So, your stantard dies do a much better job than the much more costly die set and the problem is supposed to be you need a different sizer? Interesting conclusions .... ??
Seems if you sell your GM dies you lose nothing and no dies are likely to do any better than your standard die set. ??
Re: Excessive runout .308 rcbs gold medal dies
My sinclair guage is on the way and Fuzzball you are definitely correct except I would like to neck size if I can instead of full length with my standard dies. My plan is to check my hornady guage with my sinclair that is on the way,make sure my die is true in the press, try to size down in steps instead of all at once.If that still does not fix my problem I will buy a Redding comp die set and if all else fails full length resize with my standard dies and say F it.Thanks and I will keep progress posted.
My sinclair guage is on the way and Fuzzball you are definitely correct except I would like to neck size if I can instead of full length with my standard dies. My plan is to check my hornady guage with my sinclair that is on the way,make sure my die is true in the press, try to size down in steps instead of all at once.If that still does not fix my problem I will buy a Redding comp die set and if all else fails full length resize with my standard dies and say F it.Thanks and I will keep progress posted.
Re: Excessive runout .308 rcbs gold medal dies
Three points.
One, there is no point in neck sizing below the point of bullet contact in the neck.
Two, the Lee Collet Neck Sizer often leaves necks as straight as it's possible to get and there is no fumbling with bushings.
Three, neck turning can reduce the average runout in loaded rounds. It can be over done, most of us only skim turn perhaps 60-80% of the necks circumference. Most any of the hand held turners will do nicely, I like the Forster HOT-100 because it's reasonably priced, has a "chamfer" on the carbide blade to minimise shoulder damage and has a "micrometer" cutter adjustment. I prefer to chuck my cases in a 1/2" battery drill and use a slow speed to make it quick and easy to do, my necks many not be BR grade but they are good and I don't have BR grade rifles.
Three points.
One, there is no point in neck sizing below the point of bullet contact in the neck.
Two, the Lee Collet Neck Sizer often leaves necks as straight as it's possible to get and there is no fumbling with bushings.
Three, neck turning can reduce the average runout in loaded rounds. It can be over done, most of us only skim turn perhaps 60-80% of the necks circumference. Most any of the hand held turners will do nicely, I like the Forster HOT-100 because it's reasonably priced, has a "chamfer" on the carbide blade to minimise shoulder damage and has a "micrometer" cutter adjustment. I prefer to chuck my cases in a 1/2" battery drill and use a slow speed to make it quick and easy to do, my necks many not be BR grade but they are good and I don't have BR grade rifles.
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