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Air Gun 2-die Hollow Ogive set
 
Air Gun 2-die Hollow Ogive set Quantity in Basket: None
Catalog No.: PFHP-2SP
Price: $688.00
Shipping Weight: 0.50 pounds
 
Enter ONE bullet caliber (diameter) in inches:
Enter desired weight range in grains:
Select Nose Shape:
Truncated Cone (TC)
1/2-E Blunt RN
3/4-E Pistol RN
1-E Rifle RN
2-S Spitzer
4-S Spitzer
6-S Spitzer
Custom Shape (+ $120)
Enter custom ogive specs:
Select base shape:
Flat base
Dish base (shallow concave)
Cup base (paper patch)
Hollow base (pellet, Minie, slug)
Rebated Boatail
Custom Base (enter specs) +$70
Enter custom base specs:
Diameter of flat tip, inches:
Hollow Point Opening Diameter:
Hollow Point Depth:
Core Swage Diameter (optional) .001-.008 under caliber:
  Additional Flat Base (FB) ($50)
  Additional Dish Base (DB) ($50)
  Additional Cup Base (CB) ($50)
  Additional Hollow Base (HB) ($50)
  Additional Rebated Boattail Base (RBT) ($50)
Optional Note:
 
Quantity:
 
This is a 2-die set used to produce a hollow ogive air gun slug. The body of the projectile has an oval or egg-shaped cavity, with the opening smaller than the major ID. This style cannot be formed in a single step, since the conventional hollow point is made by inserting and removing a punch while forming the ogive around it. Obviously, if the punch was larger at the end, it could not be pulled back out of the same hollow point opening. So, the hollow body cavity is formed by rolling the ogive around a pre-formed hollow cavity in a cylinder shaped core.

hollow body air gun slug The set consists of two dies. The first is a core swage die. It is a straight cylinder shape, with a cavity just slightly smaller than the final, desired caliber. For example, you might use a 0.210 to 0.214 diameter core swage for finished bullets of .216 to .218 caliber. Exact size is not important so long as the core will fit into the second (point forming) die easily, and yet is not so far undersized that it wants to fold unevenly as the ogive is shaped. For instance, you could try using a .210 core swage for making a .224 slug, but it probably would not form as even and smooth of a meplat as a .220 diameter core. And if you tried to use it for larger sizes, such as .250 diameter, it would be quite unlikely to make a satisfactory projectile.

shouldered SWC pellet The core swage could also be called a LSWC-1 die, since the two are idential in general design. The only difference is in the purpose, which in turn might affect the diameter and the punch shapes used. A LSWC-1 die is a "lead semi-waductter" swage die, which also has a straight bore and bleed holes. But typically, the diameter is built to the finished projectile size, and the punches have ends shaped to create the base and nose of a shouldered or SWC bullet. The core swage is typically made smaller than the finished bullet, since the lead slug produced in it must fit into another die without difficulty. Also, the core swage typically has flat end punches. But in this special case, we use a large round-tipped projection on the nose punch, and may use a more shallow cup base projection on the other punch.

smooth ogive slugs After forming a large hollow cavity in one end of the lead cyliner (core), it is placed in the second die with the cavity facing into the die (toward the ogive or nose). This is facing down, toward the ram. As the base punch (mounted in a punch holder in the press head) pushes the core into the point forming die, the curved walls of the point forming die compress the walls of the cylinder inward. You can push the core all the way to the end of the point forming die, which makes the smallest tip. The closure at the tip will be smaller than the cavity diameter further inside the ogive. This makes it possible to create a lighter projectile for the same caliber and length as compared to a conventional hollow point (which has much thicker walls around the hollow cavity).

.25 caliber air gun slug Although the point forming die has a synchronized ejector and bleed holes, the core should not be pushed far enough into the die to extrude any lead if you want to retain the large hollow cavity. The cavity would be collapsed if enough pressure was applied so that hte lead could flow. First the cavity would collapse, and then the lead would be extruded. The die can be used that way, but the hollow point will become a moe conventional style, formed by the ejection punch projection. This is a "hidden benefit" of the 2-die set. It is possible to make a heavier, more solid-nosed design with a smaller hollow point, regardless of whether you pre-form the core or not. However, the pre-forming step will give even moe consistent weight control than just using the point form die alone.

Please note that it is possible, sometimes, to make both a shouldered pellet in the first die if you add an optional SWC nose punch, as well as using both dies to make the smooth ogive hollow body slugs, using the large HP cavity punch. But to do so would mean making two different calibers, as the first die (the LSWC-1 or CSW-1) must be at least a little smaller diameter than the point form die. For example, if you have a .218 and a .220 or .224 caliber air gun, the .218 could be a pellet with shoulder, made in the first die, and the .220 to .224 could be a hollow body slug started in the .218 core swage. But the two dies cannot both be the same diameter.




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