Have SA remington that flattens one side of the case neck mouth upon extraction of spent case. Is my extractor spring to blame. If I release the spent case very gentle it wont do it but a nice easy stroke of the bolt will dent the mouth everytime. Can I trim some of the spring off? How much? thanks

I believe you are referring to the ejector,not the extractor.You can cut the spring back a little at a time until you get the desired results.How much depends on how far you want to fling cases.

I assume you're speaking of the ejector spring and the amount of tension on the ejector. If that is the case, yes you can adjust the tension on the ejector by driving the pin that holds the ejector in and trimming a coil or so from the spring. A suggestion, when driving the retaining pin out, don't completely remove it. You can do this by driving the retaining pin out until you feel the ejector bump the drift pin. At this point, place the cartridge case under the extractor and press it in place while you withdraw the drift pin. When you feel pressure on the case, slowly allow the case to pivot under the extractor until the pressure drops. This way you will not hear the ejector pin "thwack" off the opposite wall, never to be recovered. Be careful about how much you remove from the spring. On my Remington match rifle, I only have enough tension to drop the case on the ground next to me. On a hunting rifle, you want to retain enough tension to reliably eject the spent case. I would only remove one coil to begin with and only half a coil from there until it suits your needs.