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This was from a previous post of mine--perhaps it will either help or confuse...
Most commercial guns have slings that require about 60 pounds to cock and sears that will generally operate satisfactorily with in the range of several hundred pounds of sear pressure. Therefore a JBL/ Riffe/Biller with stock slings will create 60-120 - or 180 if three stock slings are used as on a normal out of the box stock gun.
However, slings are subject to deterioration, wear, from usage and tension creepage after being cocked or maybe the incorrect size installed by the shop or previous owner if a used gun. Slings also come in a variety of diameters, colors and rubber formulas. Therefore, all these factors affect the sling power of an individual gun --
Most serious spear fishermen of California ( I can not comment on your area) have as part of their amentarium a "sling tester." The slings are homemade, tested on a sling tester and often trimmed to require as much as 120 or more pounds per sling to load, consequently a 3 band gun will require 120-240-or 360 pounds using all three slings. The slings of my choice is the very stable black thick diameter "Prodanovich Hi Modulus." These types of guns are generally long barreled customs and requires a special trigger mechanism such as a Prodanovich, Riffe, Gibbons or preferably an Alexander to operate satisfactory under a increased load, however stock original Cavalero Arablete, JBL and a few such as the one piece Prodanovich/Potts (Bottom scratcher) mechanisms have been used satisfactorily with decreased power prior to the Gibbons introduction and American adaptation.
sdm
Most commercial guns have slings that require about 60 pounds to cock and sears that will generally operate satisfactorily with in the range of several hundred pounds of sear pressure. Therefore a JBL/ Riffe/Biller with stock slings will create 60-120 - or 180 if three stock slings are used as on a normal out of the box stock gun.
However, slings are subject to deterioration, wear, from usage and tension creepage after being cocked or maybe the incorrect size installed by the shop or previous owner if a used gun. Slings also come in a variety of diameters, colors and rubber formulas. Therefore, all these factors affect the sling power of an individual gun --
Most serious spear fishermen of California ( I can not comment on your area) have as part of their amentarium a "sling tester." The slings are homemade, tested on a sling tester and often trimmed to require as much as 120 or more pounds per sling to load, consequently a 3 band gun will require 120-240-or 360 pounds using all three slings. The slings of my choice is the very stable black thick diameter "Prodanovich Hi Modulus." These types of guns are generally long barreled customs and requires a special trigger mechanism such as a Prodanovich, Riffe, Gibbons or preferably an Alexander to operate satisfactory under a increased load, however stock original Cavalero Arablete, JBL and a few such as the one piece Prodanovich/Potts (Bottom scratcher) mechanisms have been used satisfactorily with decreased power prior to the Gibbons introduction and American adaptation.
sdm