For the 300 H & H and 375 H & H MAGNUM
On these long magnum cases it is necessary to allow 1/2" between the top of the shell holder and the bottom of the die body. All other instructions are correct for these two cartridges and should be followed.

This shows a cutaway view of a P-A Bullet Seating Die. This die features a sliding inner sleeve which aligns the bullet and case neck. The sliding sleeve also contains a built-in crimping shoulder which may, or may not, be used depending upon the reloaders' preference. The cartridge case in the illustration is shown in the non-crimp position.

The die is adjusted as follows: loosen the set screw in the large hex lock nut located on the outside of the die. Screw this lock nut toward the knurled end of the die. This will give you room to thread the die into the press. Lower the press handle until the shell holder is at its highest point. Screw the die into the press until the bottom edge of the die makes firm contact with the shell holder. Note: 300 H & H and 375 H & H do not touch shell holder. See note at top of page. When your die bottoms firmly on the shell holder, tighten the lock nut and set screw.

The seating screw bushing, located in the top of the die body, regulates the crimp. Turn this bushing out (counter clockwise) until it is almost free of the die body. Place an empty sized cartridge case in the shell holder and pull down on the press handle until the shell holder is at its highest point. Turn in (clockwise) on the bushing until you "feel" it bottom lightly on the sliding inner sleeve. When you feel it contact the inner sleeve, back off 1/4 turn and tighten the set screw located in the side of the die body. Your cartridge is now in the non-crimp position shown in the illustration.

Your bullet must now be seated to the proper depth. Turn out the seating screw about 1/2". Place a cartridge in the shell holder and a bullet in the mouth of the case. Pull down on your press handle until your shell holder is again at its highest point and turn down the seating screw until it comes into contact with the bullet.

Alternately raise the handle and turn down the bullet seating screw a little at a time until the bullet is seated to the desired depth. Once your bullet is seated to the depth desired tighten the seating screw lock nut. Your die is now adjusted to seat bullets without crimping.

CRIMPING
If you wish to crimp on jacketed bullets which have crimping grooves, continue as follows: make certain your bullet is seated exactly to the crimping groove. Loosen the set screw which is holding the seating screw bushing and turn in (clock-wise) 3/4 of a turn on the bushing. Re-tighten your set screw and your die will be adjusted to crimp the bullet in place.

The unique design of your P-A Bullet Seating Die affords a high degree of interchangeability between different calibers. In some instances, the same die is used for several calibers. Where this occurs, a list of these calibers are marked on the die body. In other instances, changing the seating screw, sleeve, or die body will convert your die to another caliber.

Die Bodies
Die bodies are 305, 355, 383, 428, 452, 467, 478, 506, 520 (467 peculiar to 30/40 Krag)

They were bored from the top to a standard configuration, with the only difference being in the lip around the mouth of the die.  This "lip" provided better centering of the case head in the die. [Ed.] There are short PA dies, like the 256 Win Mag. If I get more information on the die body lengths, I'll post it.

Seating Screws
    I have a 450 and a 450A in hand. Oddly, there does not appear to be any difference in tip radius. It may be there are different seating screws for jacketed and cast bullets, but I can't prove it... [Ed.] The possibility exists that a standard Seating Screw will fit into the Sliding Sleeve. But the standard die Seating Screw will be shorter than the PA Seating Screw, so the standard Seating Screw will have to screw farther into the Seating Screw Bushing in order to work... My SWAG is analogous to a 7x57 working with the standard (short) Seating Screw, but the 7mm BR would not, since the case body is shorter... [Ed. just a match made at random, I have no way to verify this!]

There appears to be three Seating screws.
450A 22 cal - 28 cal .221 dia x 1.000 long

467A 30 Cal - 32 cal .304 dia x 1.000 long

Sleeve Dimensions

If you can enlighten me with further information, I'd love to get it Contact me. A list of the PA number to supported cartridges, for one.

Needed PA die numbers:

PA12, PA14, PA25, PA27, PA28, PA30

Die	Cartridge	Body	Sleeve	Seat Screw
PA1	22 Jet, 221, 222, 222 Mag, 223 Rem	383	22	450A
PA2	219 Zipper, 225 Win	428	22	450A
PA3	.218 Bee	355	22	450A
PA4	22 Hornet, 22 K-Hornet	305	22	450A
PA5	.220 Swift, .220 Weatherby	452	22	450A
PA6	22/250	478	22	450A
PA7	.243, 244 (6mm Rem)	478	24	450A
PA8	250 Sav (250/3000), 257 Rob, 25-06	478	25	450A
PA9	25 Rem, 25/35	428	25	450A
PA10	256 Win Mag	383	25	450A
PA11	25-20	355	25	450A
PA12
PA13	6.5 Jap, 6.5 Ital, 6.5 M.S.	452	26	450A
PA14
PA15	.264 Win Mag, 6.5 Rem Mag	520	26	450A
PA16	270 Win	478	27	450A
PA17	25 Rem	428	25	450A
PA18	7x57mm, 280 Rem	478	28	450A
PA19	284 Win	506	28	450A
PA20	7mm Rem Mag, 7mm Wea, 7x61 S&H	520	28	450A
PA21	30/30, 30 Rem	428	30	467A
PA22	30/06, 300 Win, 300 Savage	478	30	467A
PA23	30/40 Krag	467	30	467A
PA24	308 N. Mag, 300 W. Mag, 300 Wea, 300 H&H	520	30	467A
PA25
PA26	303 British	467	31	467A
PA27
PA28
PA29	32/20	355	31	467A
PA30
PA31	8x57mm, 8mm M.S	478	32A	467A
PA32	338 Win Mag	520	33	999A
PA33	35 Rem, 35 Win	467	35	999A
PA34	350 Rem Mag, 350 Norma Mag	520	35	999A

15 July 2018:

Thanks to Scott Haenel for the identities of PA 4, 16, and 32.

Thanks to Neil for confirming PA26 as the .303 British.

22 Sep 2018
Thanks to Scott Haenel for the Sleeve IDs for .270 and .338, also the Seating screw dimensions for 999A.

25 July 2019 
Brian Hill confirms the PA16 is the .270 Win, Sleeve 27, seating screw 450A

The chart below lists the various calibers for which P-A Dies are available. It shows the part numbers for the various body sizes, sleeves and seating screws which make up each die. The same die may be used for any caliber which has matching part numbers. Where numbers vary, new parts or required for the conversion. Specify the part, and part number, when ordering.

Original names for Conversion Parts:
SEATING SCREW w/CHECK NUT (eg. Seating Screw Lock Nut)
INNER SLEEVE
DIE BODY w/CHECK NUT