Why is my Lube squishing

[fiatdad]

What causes the lube to squish under the bullet when sizing?

[runfiverun]

a bevel base will also allow this to happen even if the adjustments are correct.

[mold maker]

The speed with which the handle is operated can also allow lube under the boolit. There is no complete and final answer as each lube and boolit shape is a unique problem unto itself.

[JonB_in_Glencoe]

What causes the lube to squish under the bullet when sizing?

Fiatdad,
Welcome to the forum.
If your lubesizer is adjusted so one of the die's lube ports is aligned with the boolit base while the press is in the bottom of the stoke, that issue can arise ...and too much heat and/or too much pressure can exacerbate that.

[gwpercle]

The alignment of a lube hole to the base is most critical, adjust it so the/a hole is aligned with the lube groove , not in line with the base . Over pressuring with the little lube handle is also important. Use the least amount of pressure as possible , I can add some pressure and lube 3 or 4 boolits without having to add more pressure. You don't need much pressure at all .
The process has a learning curve , real fine line between too much and just right. Practice and paying attention to what works will get you in that just right zone.
Welcome to the forum !
Gary

[kevmc]

If the base of your boolits are not being sized (cast slightly undersize), they can act like a bevel base and allow lube under boolit.
If it happens with some, but not all, check sized dia. of those that allow lube under base and compare to those that do not.

[randyrat]

Ditto........... on the Over heating and too much pressure

[Dusty Bannister]

You may want to be sure that the base of the bullet is flat and does not have the sprue nub on the base. That will create a gap for the lube to migrate. If the base is flat and square, then be sure that you move the handle so the bullet is fully into the die and the center pin of the die is against the depth stop, hold it there for a short time and then move the handle to eject the finished bullet. Some pressure is helpful to keep the bullet base against the ejector pin, but not so much pressure that you distort the nose of the bullet.