In firearms, a choke is a tapered constriction of a shotgun barrel's bore at the muzzle end.Chokes are almost always used with modern hunting and target shotguns, to improve performance. Their purpose is to shape the spread of the shot in order to gain better range and accuracy.n the case of choke tubes, the amount of choke for each barrel is usually stamped on the side of the choke tube, or there may be thin slots cut in the exposed rim of the tube at the barrel opening with the number of slots corresponding to the number of *'s in this table.
Major differences between CRM and eCRM: Customer contacts. 1  CRM â Contact with customer made through the retail store, phone, and fax. 2  eCRM â All of the traditional methods are used in addition to Internet, email, wireless, and PDA technologies.
What Is A CPM. A Certified Professional Midwife (CPM) is a knowledgeable, skilled and professional independent midwifery practitioner who has met the standards for certification set by the North American Registry of Midwives (NARM) and is qualified to provide the Midwives Model of Care.