Yes maybe that's why I didn't know what they are. ;]I'm assuming you mean the Lee neck sizing collet dies.
But we all know what happens when I do that.
I used to use them for a few cartridges, but those were used for hunting.
I've since changed to the solid full length sizing dies.
I'm not aware of anyone using them to load for Benchrest.
That's all I have ever seen is the type S. I load 3 different calibers w them.https://support.leeprecision.net/en/knowledgebase
I tested a collet die for my 243win. Took 20 pounds pressure on my Rock Chuker handle, to size a neck, using Lee instructions.
To much work to just size a neck.
All that is needed to size, is a Redding Type S fl Bushing Sizing die. A a few bushing.
I'm not aware of anyone using them to load for Benchrest.
Your not THAT odd FujI'm always the odd man out.....LOL. Ammo is straight as can be
and tensions after annealing is why I do not use bushing dies
any more on my cats. Been shooting a good bit of high ones
with the current one I'm working on. This particular collet die
is the older version that does the whole neck, and I do my own
custom mandrels.
I use these along with a body die (Redding) to size the body and set the shoulder bump.
TKS. Good to know. Will give this a try.The Forster Bushing-Bump die (without the bushing) bumps the shoulder and IME cases chamber and extract as well as if FL sized over multiple firings.
I use the SAC mandrel dies and I think they work great. I hate paying for them but seems to work okay. One thing I don't like is over working the brass to go under the size you want by a few thousands only to have the mandrel open the neck back up for final size. You also have to add in your spring back. You also have to lube the necks but I use graphite which is easy (but messy) to use. I like knowing that brass concentricity is dead on (using a Präzipress 120 press) and my final size is based on the inside mouth of the brass. Just like anything else there are a ton of ways to skin a cat but this is my way. I used to use Harrold's custom dies. That system worked really well for me for years. Now Calvin (my brother) is using the Harold's dies. He kind of took over my old dies when I moved over to SAC.They are a step above normal box store reloading dies. But there are several better ways. Been there done that.
What I do is purchase several standard ones (mandrels), chuck them up in a drill and polish/sand down to the size I want. JMEI've used the Lee collet dies since they came out. I have found if I run hot loads I still have to size the body every 3 or 4 times. Lee will make custom mandrels if you want less neck tension. I don't find the force needed any more than a full length die.