if you install a lighter spring, do not shoot magnum loads as you can damage the rear of the receiver. I have seen guns with weak springs with the rear of the bolt peened over and the inside rear of the receiver broken out. The heavier springs just help to ensure a good solid closing of the bolt and I use them in some of my guns that only see a lot of magnum loads, They will still cycle heavy trap loads too but not 1oz loads in my experience.
CPL holder since 1991, NRA Lifetime Member, DU Member, NICET certified
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