Re: Recoil spring
Just an opinion here. My feeling is that you will increase muzzle rise at the beginning of recoil unless you grip it more tightly because it requires more force to start the slide movement. The overall recoil will not increase or decrease because it is the same bullet and gun but the recoil curve will change putting more effort into the beginning of it. For certain you will need to have a tighter grip to keep the muzzle down at the beginning of recoil to counteract the increased spring tension as the slide begins to move. With hot loads and heavy bullets I think the increased spring tension will smooth out the recoil but probably have muzzle rise over a longer time because the rearward movement of the slide will be longer. A light spring would work the action faster but more sharply at the end.
I have never increased spring tension but I have decreased it for those that don't grip the gun tightly ending up with jams because they don't resist the movement enough. With a heavy spring you need to restrain the gun more during recoil so the action can overcome the extra resistance of the stiffer spring. If you don't the gun will rotate in your hand not providing enough resistance against the gun movement and it will jam.
I look at it this way, if you are aiming the pistol with no spring or a very light spring, another person could slam the action back without you coming off the target much, but it would hit sharply at the end. If the spring was very stiff they would have to jerk it harder pulling the gun up and back over a longer time, it would feel softer but you would have to fight to keep it down.
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