nose portion on removal of the cap 16 the fastening pin 58 joins the bottom cap 16 on disengaging the pin 58 the sample can be quickly retrieved by pulling the bottom cap from the bore portion at the rear and the sample is easily pushed to the rear and out the rear opening alternately by removing the set screw 46 the nose portion 12 and the carrier portion 14 may be separated as will be observed the surrounding skirt or wall 44 defines the maximum diameter of the bullet typically the bullet will enter until the shoulder 26 is significantly engaged by the formation should the shoulder 26 pass into the formation by some distance the bullet body is cylindrical behind the shoulder 26 enabling easy retrieval moreover should the formation tend to grip the bullet after penetration the grip is released in more or less easy fashion by disengagement from the tapering outer face 24 sliding beneath the release ring as will be understood this device is intended for multiple use it can be used repeatedly should wear occur the first point of wear is at the nose portion and it typically can be replaced while the carrier can be used again and again the carrier may wear at the face 26 or on the exposed wall just behind the shoulder 26 in either case such wear and tear do not detract from the repeated use of the carrier of the three members the carrier is relatively more expensive to machine and manufacture and hence relative long life for the carrier cuts down on the cost of the sample collection procedure the bottom cap is also a relatively durable item.