Geronimo Jim
Gold $$ Contributor
Sinclair bushing has diameter stamped on one side. Which side goes down?
Or does it matter? Thanks
Or does it matter? Thanks
Which way does bushing go in???
- Thread starter Geronimo Jim
- Start date
Whatever works for you.
The bushing is mostly chamfered and most people most of the time put the chamfer side down to ease the case into the bushing. For a little tighter a little farther down the neck put the tight side down.
The bushing is mostly chamfered and most people most of the time put the chamfer side down to ease the case into the bushing. For a little tighter a little farther down the neck put the tight side down.
Results might even vary between a type S die with a fixed position bushing and micrometer adjustable bushing.
Trying to get perfect results by following the directions as
found on the internet perfectly is a snare and a delusion.
Trying to get perfect results by following the directions as
found on the internet perfectly is a snare and a delusion.
What ever works for you is the iron law.
Ed
That’s a good point, punching #s may have raised surface
Thanks
That’s a good point, punching #s may have raised surface
Thanks
Dusty Stevens
Shiner
I put the numbers up. Ive never used any sorry enough to cause runout where the numbers are- im betting your sinclair wont either
BoydAllen
Gold $$ Contributor
Some bushings (RCBS) have their numbers on their sides which are recessed in the middle. https://www.brownells.com/reloading...gs/steel-neck-sizing-bushings-prod110927.aspx
Not too many know about these. I have used the coated ones and measured them and they are just fine.
Not too many know about these. I have used the coated ones and measured them and they are just fine.
Tech Line & Tips (FAQs)
Concentricity & Bushing Dies
https://www.redding-reloading.com/tech-line-a-tips-faqs/142-concentricity-a-bushing-dies
From tests we have conducted, we have learned that selecting the correct bushing is the most important factor in producing sized case necks that have good concentricity with the case body. Our tests showed that case neck concentricity is directly proportional to bushing size. In other words, as you size case necks with progressively smaller bushings, the concentricity gets progressively worse.
Our current recommendation, is to select a bushing that is .001 to .002" smaller than the loaded cartridge neck diameter. For example, if the neck diameter of your loaded cartridges is .248", start with a .247 or .246" bushing. We've had to change our initial recommendation, because some of cartridge cases manufactured today have neck walls near the minimum SAAMI thickness. When using brass which is at the thinner end of the SAAMI spec. we have found the bushing which is .001" smaller will provide the best result.
To create precision reloads, you must start with cases of good quality. They should all be from the same manufacturer and lot number. A good measure of case quality is how uniform the neck wall thickness is. Cases with uniform neck wall thickness, will be of uniform thickness all the way to the base. This is important for accuracy, as the cases will expand uniformly upon firing, and contract uniformly when sized. Neck turning helps, but it's only a partial cure, as you can't turn the case wall all the way to the base. The Redding Case Neck Gauge is the preferred instrument for checking neck wall thickness and uniformity. Also note that the concentricity of a fired case only indicates how concentric your firearm's chamber is. It provides you with little or no information on the quality of the cases you're using.
Other factors that can improve concentricity:
Concentricity & Bushing Dies
https://www.redding-reloading.com/tech-line-a-tips-faqs/142-concentricity-a-bushing-dies
From tests we have conducted, we have learned that selecting the correct bushing is the most important factor in producing sized case necks that have good concentricity with the case body. Our tests showed that case neck concentricity is directly proportional to bushing size. In other words, as you size case necks with progressively smaller bushings, the concentricity gets progressively worse.
Our current recommendation, is to select a bushing that is .001 to .002" smaller than the loaded cartridge neck diameter. For example, if the neck diameter of your loaded cartridges is .248", start with a .247 or .246" bushing. We've had to change our initial recommendation, because some of cartridge cases manufactured today have neck walls near the minimum SAAMI thickness. When using brass which is at the thinner end of the SAAMI spec. we have found the bushing which is .001" smaller will provide the best result.
To create precision reloads, you must start with cases of good quality. They should all be from the same manufacturer and lot number. A good measure of case quality is how uniform the neck wall thickness is. Cases with uniform neck wall thickness, will be of uniform thickness all the way to the base. This is important for accuracy, as the cases will expand uniformly upon firing, and contract uniformly when sized. Neck turning helps, but it's only a partial cure, as you can't turn the case wall all the way to the base. The Redding Case Neck Gauge is the preferred instrument for checking neck wall thickness and uniformity. Also note that the concentricity of a fired case only indicates how concentric your firearm's chamber is. It provides you with little or no information on the quality of the cases you're using.
Other factors that can improve concentricity:
- Lube case necks, even with TiN coated bushings.
- Partial size case necks. Sizing 1/2 or 3/4 of the neck seems to be the most popular.
- Try flipping the bushing over. We like to install them with the letters down to start with.
- Trim cases mouths square so they will enter the bushing straight. Don't forget to chamfer the case mouth, inside and out. This is very important as it eases the entry of the case mouth into the bushing, and the bullet into the case mouth.
- Anneal case necks. Cases that have been fired many times work harden and this causes excessive spring-back of the case necks.
Last edited:
centershot
Silver $$ Contributor
Whidden tells you what side goes down. I also have found that the Redding nitrate bushings are not the same size as the steel bushings.
Dusty Stevens
Shiner
Or use the crt bushings that do not have stamped numbers! They even have an arrow to tell you which way to put them in. Use quality stuff is the takeaway here. Although you can load ammo with a $15 die eventually youll have a drawer full of progressively more expensive stuff as you advance in your reloading prowess. Why not just buy good stuff to start with? I assure you its cheaper- ive been there, done that, and ive seen it on here a bunch of times too.
Dusty Stevens
Shiner
Or just use a non-bushing Forster full length benchrest die and have very concentric cases.
Thats not a very versatile solution. Its one thatll end up in a stack and will be in a picture posted here of marginal dies someday. One in ten will work ok with one lot of brass.
To get back to the OP question...Regardless of where a bushing is stamped, place it in the die with the most beveled edge down. You want the most beveled part toward the neck-shoulder junction because you want that unsized part of the case neck to help center the bullet in the neck section of the chamber.
And as far as where to get carbide bushings, you can try Bud Munday (good luck reaching him), or contact benchrite dot com. Benchrite even sells half-thousandth sies
And as far as where to get carbide bushings, you can try Bud Munday (good luck reaching him), or contact benchrite dot com. Benchrite even sells half-thousandth sies
KMart
Gold $$ Contributor
CRT, Custom Reloading Tools, was taken in by Whidden. I don't know if Whidden took in all their stuff, but they definitely took in the die bushings, and are now sold under the Whidden name.
Dusty Stevens
Shiner
Like mr kmart said whidden put their name on them now. They always sold them but now its even more of a one stop shop for all your die needs.
BoydAllen
Gold $$ Contributor
If you have a concentricity gauge try every sort of experiment, and you will soon learn what works best for your situation.
I have seen a lot of small groups shot at sanctioned short range benchrest matches, with cases sized using bushing dies. Of course the chamber clearance of those rounds necks is much closer than you would find in a factory chamber.
Years ago, I asked a fellow at Wilson (who was a short range benchrest competitor) what he knew about the level of loaded round concentricity required to not enlarge short range groups. He told me that .002 or less would not degrade accuracy. For my PPC ammo, it runs around .0015 or a little less. I know some of the current record holders in short range benchrest and to my knowledge none anneal. Some of the top shooters, but not all, discard brass at the end of a match weekend.
Some years back, using a 6PPC round loaded with the bullet engaging the rifling, I used the straightening feature of the gauge to create .0035 runout at which point I chambered the round and rechecked it. It then read .0015, which was the approximate chamber clearance of the ammo that I was loading.
IMO, because we have the tools to measure some things very accurately we can become so focused on those factors that we overlook things that may be having a larger effect. We can also end up trying to fix a problem by changing something that is not the cause.
I have seen a lot of small groups shot at sanctioned short range benchrest matches, with cases sized using bushing dies. Of course the chamber clearance of those rounds necks is much closer than you would find in a factory chamber.
Years ago, I asked a fellow at Wilson (who was a short range benchrest competitor) what he knew about the level of loaded round concentricity required to not enlarge short range groups. He told me that .002 or less would not degrade accuracy. For my PPC ammo, it runs around .0015 or a little less. I know some of the current record holders in short range benchrest and to my knowledge none anneal. Some of the top shooters, but not all, discard brass at the end of a match weekend.
Some years back, using a 6PPC round loaded with the bullet engaging the rifling, I used the straightening feature of the gauge to create .0035 runout at which point I chambered the round and rechecked it. It then read .0015, which was the approximate chamber clearance of the ammo that I was loading.
IMO, because we have the tools to measure some things very accurately we can become so focused on those factors that we overlook things that may be having a larger effect. We can also end up trying to fix a problem by changing something that is not the cause.
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