Do you know its Possible to Outside Neck Turn & Still use Standard Dies.
Sinclair-Case Prep Steps to Minimize Run-Out
The first steps that can be taken are in your case prep regiment. One of the first areas to look into with new brass is to check neck wall thickness consistency. You are looking for cases that have case necks that have fairly consistent thickness around the diameter. Using a tool such as the Sinclair Case Neck Sorting Tool (Part # 59-1000) can quickly help you determine the consistency of the thickness of the neck walls. Standard brass may have a thickness variance as much as one to two thousandths of an inch. Higher quality brass will have a more consistent neck wall thickness with little or no variance. Inconsistent neck wall thickness can cause bullet run-out since different pressures are applied to the diameter of the seated bullet. Either sort through and cull your brass for consistent walls or perform a “cleaning cut” by neck turning the difference in consistency off the necks of the entire lot to create common consistency. (Neck turning is a whole other cup of tea and will be discussed in future features).
Other areas of case prep that can make a difference in bullet run-out is to maintain consistent case length and trim when needed, lightly inside chamfer and outside de-burr the case mouths. I prefer the Sinclair 28 degree “VLD” inside case mouth chamfering tool (Part # 26-6250) for most of my rifle and even pistol case prep. Additionally clean out and wipe off the necks of the cases once prep time is finished.
Sizing Steps to Minimize Run-Out
One of the most common steps in the reloading process that contributes to bullet run-out occurs is the sizing operation. If improper techniques are used or there are issues with the sizing die set up, a once perfectly concentric case can become out of whack. By using the proper dies for your application, properly setting up the die/shell holder or floating the de-capping/expander assembly, you can eliminate problems before they happen.
The choice sizing die by many of us on the technical staff is the Redding Type-S series of dies. These are full-Length or neck sizing dies that utilize a removable/changeable neck bushing (sold separately) to size the neck according to your application. These dies are machined with true precision and quality in mind. The Type-S dies come with a standard de-capping assembly with a caliber specific expander ball in place. In addition to this an undersized retainer to hold the de-capping pin is included with the die. In my experience with these dies I use the standard expander ball with new, unfired brass on the initial re-size. I will then use the undersized retainer in place of the expander ball with brass that has been fired. I have found this step crucial in my reloading regiment to minimize bullet run out. The use of the expander ball can cause a few thousandths of run-out when the case is being pulled back out of the sizing die. With the undersized retainer in place the only thing that touches the neck of the case in sizing is the bushing. If you prefer to use an expander ball, Redding offers caliber specific carbide floating expander balls that fit on the de-capping rod. This free floating expander ball will self center on the case neck, and reduce the amount of run-out that can be caused by a standard expander ball.
When setting up a Type-S sizing die, set the neck bushing into the die with the numbers facing down toward the body of the die. Tighten the de-capping assembly until it contacts the bushing and then back it off ¼ of a turn. This allows the bushing to free float in the die. You should be able to hear the bushing rattle if you shake the die. Having the bushing free floating self centers the neck, and again minimizes any run-out that can occur.
If you prefer other brands of sizing dies there are a few tricks that people use to minimize run-out as well. Many reloaders claim that the use of an “O”-ring at the base of the de-capping assembly lock nut will float the assembly and help self center during sizing. Another trick that has been used is to remove the retaining pin on the shell holder slot on the press ram, and use an “O”- ring in its place to hold the shell holder in place. This allows the shell holder to self center during sizing as well.
Seating Steps to Minimize Run-Out
Another common step in the reloading process where bullet run-out can be caused is in the bullet seating process. The first thing you can do is to use a high quality die with a sliding sleeve. The sliding sleeve perfectly aligns the case with the bullet to be seated. Good examples of these dies are the Redding Competition Micrometer bullet seating dies, Forster Ultra Seaters, or RCBS Competition Seating dies. All of these dies utilize a micrometer top to precisely set seating depth. They are all very high quality dies that have tight tolerances to maximize bullet straightness during seating.
Of the many questions we receive most of the callers are trying to seat long pointed bullets such as the Berger VLD or Hornady A-Max. One problem that the reloader faces with longer bullets is that they are so long that the standard seating die stem (the part that pushes the bullet into the case) is not machined deep enough to contact these bullets properly. The point of the bullet is “bottoming out” in the stem and the result is off center seating and/or rings and dents on the bullet nose. What should be done if you plan on using such bullets, is to purchase a “VLD” style seating stem, which is cut to accommodate the longer bullets. The use of this stem results in truer seating of the bullet without leaving a ring or marring the tip of the bullet.
Besides using a traditional press and threaded seating die another great way to get a true bullet seat is by using an arbor press and Wilson chamber type seating die. These dies are cut to very tight tolerances and have proven themselves for years as the main choice for bench rest enthusiasts. The design of the die positively aligns the case with the bullet as they are both captured by the die before the bullet is pushed straight into the case by the stem. These seating dies are available with the standard seating cap and stem or an additional micrometer top can be added for precise adjustment. Wilson also offers a stainless seating die with an integral micrometer seating head. This process is quick, true, and a great way to get the most out of your reloading!
Finally another trick used by many in the seating process is to turn the case while the bullet is being seated. Some people claim this will keep things straight. What they do is raise the ram in increments while seating and rotate the case in the shellholder in increments of 90 degrees from the original starting while the bullet is being seated. Personally I have tried this and have seen no significant difference at all. However you may be the judge of this one. It makes sense, and maybe I should try this a little more before I rule it out.
Bullet Straightening Tools
For those who want to mechanically straighten a loaded round there are a few tools out there that will help you true them up. The Hornady Lock- and- Load Concentricity Gauge (Part #050076) has a straightening feature. The gauge uses a threaded screw that you can tighten down on the bullet and observe how much you have straightened it out on the included dial indicator or how much more adjustment is needed. It can take a little bit of trial and error to get this just right, but it does work. Additionally there are other tools on the market that straighten out bullets. However, one concern that comes up is what are you doing to the neck of the case in terms of neck tension? If any of you have used these types of tool with success please post something on our blog and let your fellow reloaders know. From my experience it is time consuming, and I would rather spend my spare time loading and shooting.
