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I am in Desperate need of a Lock-N-Load A-300 Winchester Mag Modified Case

In stock at Creedmoor sports.
 
Never used these guys, but as able to add to cart and is in stock.
 
If you send Hornady a case that has been fired in YOUR rifle, they will make you one for not a lot of extra $.
 

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Easier way to proceed (and you might totally abandon the Hornady tool, as I did):
  1. Resize a fired case per your usual process.
  2. Use a hacksaw or Dremel tool to make two vertical cuts on the case neck, from mouth to shoulder.
  3. Resize the neck. You now have a case which will hold a bullet snugly but allow said bullet to be moved with relatively light pressure.
  4. Seat a bullet long in the split-neck case (you want the bullet correctly aligned).
  5. Push the assembled "cartridge" completely into the chamber, which will push the bullet into the lands before the bullet slides back in the split case.
  6. Taking care to protect the crown, insert a cleaning rod into the muzzle and carefully push the "cartridge" loose.
  7. Repeat steps 5-6 a few times, until you don't feel resistance to pushing the bullet out of the lands.
  8. Take your COAL / CBTO measurement.
I found that this procedure gives CBTO measurements to the lands that are much more consistent than the Hornady tool ever did.

My $.02.
 
Easier way to proceed (and you might totally abandon the Hornady tool, as I did):
  1. Resize a fired case per your usual process.
  2. Use a hacksaw or Dremel tool to make two vertical cuts on the case neck, from mouth to shoulder.
  3. Resize the neck. You now have a case which will hold a bullet snugly but allow said bullet to be moved with relatively light pressure.
  4. Seat a bullet long in the split-neck case (you want the bullet correctly aligned).
  5. Push the assembled "cartridge" completely into the chamber, which will push the bullet into the lands before the bullet slides back in the split case.
  6. Taking care to protect the crown, insert a cleaning rod into the muzzle and carefully push the "cartridge" loose.
  7. Repeat steps 5-6 a few times, until you don't feel resistance to pushing the bullet out of the lands.
  8. Take your COAL / CBTO measurement.
I found that this procedure gives CBTO measurements to the lands that are much more consistent than the Hornady tool ever did.

My $.02.
^^^100%, this works much better actually than the variability I get with the Hornady product. Marc from Spartan rifles does the same. This is the same process as the Hornady if one was wondering. It is just the viability in the ultra-light case neck that makes it harder to get a consistent reading as pointed out above.