I tend to go a max of 12 or 13 but I've heard of people going up to 30 and even 60 but I would not try that it could mess up the spring. By the way the more pumps the higher it shoots 12 pumps at about 55 yards i think
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Whoever answered the above question is giving you poor information. DO NOT over pump the model 760 it will eventually blow the seal. First of all there is NO spring it has an air chamber and valve. I've attacked a link to the Owners Manual (See Below). Crosman Owners manual says DO NOT pump the rifle more than 10 time and not less than 3 times. There are more than 5 variations of the model 760 but all of them pump the same way. The Model 760 is rated at 600 FPS (Feet Per Second) when shooting a BB, it will be slightly slower with a pellet depending on the weight of the pellet. Any over pumping will shorten the life of the valve and destroy the rifle.
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The number of times you need to pump a Crosman Pumpmaster 760 air rifle depends on the desired velocity of the pellet or BB being fired. Generally, for lower velocities and shorter distances, 3-5 pumps may be sufficient. For higher velocities and longer distances, 8-10 pumps or more may be necessary. It is important to refer to the manufacturer's guidelines for the specific air rifle model to ensure optimal performance and accuracy.