This collet die is universal, and it works on all belted magnum cartridges (except 224, 240, 378 and 460 Weatherby).   There are no extra collets required.   Before each use, be sure that the die and collet are absolutely clean - especially the slots on the collet.

Always use a good high-pressure lubricant on the outside of the collet, and on your shell casing.   Use plenty of "Imperial Sizing Die Wax" for best results.   It is easy to use, not sticky, and experienced reloaders prefer it.   Never use a liquid lube.

This collet die should only be used on cartridge cases that have already been resized with a full length (or) neck sizing die.   Always headspace on the shoulder, not the belt.   We have had belted magnum cases last more than 20 firings with maximum pressure handloads.   This collet die only needs to reduce case diameter .001" smaller than one of your fired cases.

The "top" of this die serves as a case width gauge that shows how your handloads fit in the average chamber.   There is no need for your handloads to duplicate the diameter of factory loads.   This die avoids overworking the brass and ensures a reliable fit in your chamber.

Cases that are fired repeatedly without ever using the collet resizing die could swell beyond recovery.   Always check fired cases to see if they will drop freely into the top of the die.   Remember that the size of different rifle chambers can vary considerably.

Note that the collet is slightly tapered.   The small end is identified by a 45 degree cut on that end.   Slide the collet over the case and be sure that it contacts the belt.   The small end of the collet must face the mouth of the case.

Remove the locking collar and insert the die (from the bottom) into your press.   Adjust the die all the way into the press, as far as it will go.   Then replace the locking collar on top of the die.   The ram of your press (with shell holder inserted) should be at the very top of it's travel - if possible.   This setting allows maximum press leverage.   Resize the expansion ring on your case (just above the belt) as needed or down to .510".

If resizing seems to require too much pressure, withdraw the case, rotate it, and press it into the die again.   Be sure the collet stays seated against the belt.   The collet can easily be separated from the case by inverting it, holding the mouth of your case against the shell holder, and carefully use your press to push the case out of the collet and into the die.