Thread: Glock blows up!
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Old 12-11-2009, 08:39 AM
zeke zeke is offline
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Depending on specific combination of firearm and load being used, bullet setback is a real concern, even with factory ammo. Especially with full power jacketed bullet loads. Using Lee's undersize die in combination with their universal belling die and a Redding competition bullet seater, bullet setback problems can virtually be eliminated. Ya also need to be aware of the brass thickness and dia of bullet being used.

The Lee undersize die can be used to undersize the brass to below the base of the bullet, when the bullet is seated in the brass. This has the same effect of cannuluring the brass.

I once mentioned loading for a .40 High Power on this forum. Skip warned me up front, but tried it anyway. Blew a mag out the bottom, using RP brass and standard brass prep procedures. Since then used up all the rp brass loads in a 646. Then used Fed brass and a Lee undersize die. No problems since, even with the strong spring of the .40 HP.

Now use this procedure for certain 9mm, 45 acp and 40 caliber jacketed loads.

A lee universal belling die does not expand the sized brass back out, past the mouth of the case. A Redding competiton die keeps the bullet straight while seating a bullet in the undersize case. And yes this is significantly more work, which is not usually required for low power lead target loads.
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