Too much bell.
Insure the bellcrank and the return rod bolt (in the frame) FIG 53 are aligned. Using a 5/32" Allen wrench, snug the collar clamp screws.
While holding the powder measure in place, snug the lock ring using a 11/8" wrench.
Station 7 - General Information on Bullet Seating
The purpose of the seating die is to insert the bullet into the case and to push it down into the case the proper amount.
How far the bullet is pushed into the case will determine the overall length (OAL). Several factors go into determining the proper OAL - such as, the maximum recommended OAL, listed in the reloading manual, and the type of bullet being loaded. The type of bullet can determine the OAL in one of two ways.
Fig. 54 & 55 - Shown are several examples of a cannelure or crimping groove.
If the bullet has what is called a cannelure, or crimping groove Fig. 54 & 55, this will determine the proper OAL. If the bullet you're using doesn't have a cannelure or a crimping groove, then you'll need to refer to your reloading manual for the suggested OAL. The purpose of the cannelure and crimping groove is to secure the bullet by giving the mouth of the case a place to go (without deforming the bullet) when being crimped. When the bullet is properly seated, the mouth of the cartridge case should be near the top of the cannelure/crimping groove.
Refer to your reloading manual. Under the section specified for the caliber you're loading, you'll find a schematic of the cartridge. For example, .38 Special lists a maximum OAL of 1.55" (Lyman Reloading Handbook). If you're seating the bullet to the cannelure/crimping groove, the OAL should be well within the maximum OAL listed, however, use a set of dial calipers to check it. (Dial calipers are available from Dillon Precision). If the bullet you're using doesn't have a cannelure/crimping groove, refer to the specific type of bullet you're using in the reloading manual. For example - if you're loading a 158 gr. .38 Sp. JHP and it doesn't have a cannelure/ crimping groove, use the suggested OAL of 1.480 (Lyman Reloading Handbook).
Station 7 - Installation and Adjustment of the Seating Die
Take the seating die from the die box and screw it into Station 7. Screw the die down until the bottom of the die is flush with the bottom of the toolhead. Note: At this point the die will not be screwed down far enough to begin seating the bullet, but it will give you a place to start.
Place a case (with a belled case mouth) into Station 7. Fig. 56
Place a bullet on the belled case mouth and lower the toolhead. Then, raise the toolhead just enough to inspect the bullet without indexing the shellplate. If the bullet is not seated deep enough, screw the seating die down 1/2 turn at a time. As a guide, one full turn moves the die down about 70 thousandths of an inch, about the thickness of a nickel. Again, cycle the machine and inspect the seating depth. Repeat these steps as necessary until the correct overall length is achieved. Use a dial caliper or equivalent to measure the overall length of the cartridge. Check the overall length of the round against the information in your reloading manual.
Once you have obtained the proper OAL, replace the cartridge into Station 7 and lower the toolhead. Using a 11/8" wrench to turn the lock ring and a 7/8" wrench to hold the die body, snug the lock ring.
Note: If you ever load a cartridge that you are unhappy with, you can use a Dillon bullet puller to reclaim your components.
Station 8 - Installation and adjustment of the Crimp Die
Screw the crimp die into Station 8. Screw it down until it is flush with the bottom of the toolhead. This is a good starting point for the crimp adjustment.
Place a cartridge with a properly seated bullet into Station 8.
Fig. 57 - Cut away crimp die shows the area being crimped while the case is being fully supported by the die body.
Lower the toolhead and continue to screw the die down until it touches the cartridge. Fig. 57
Raise the toolhead and screw the die down 1/8 of a turn, lower the toolhead.
Raise the toolhead half-way and inspect the cartridge. If the bell is still present, or the desired amount of crimp has not been achieved, give the die a 1/8 turn down and try again. Continue making small adjustments to your crimp die until the desired amount of crimp has been achieved.
Once the adjustment is complete, place the case back into Station 8 and lower the toolhead. Using a 1-1/8" wrench to turn the lock ring and a 7/8" wrench to hold the die body, snug the lock ring.
Note: When adjusting the crimp die it is important to know what to look for. Check that the crimp: Looks OK, allows your firearm to function consistently and the bullet feels tight in the case.
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