The 38MR started in 1960. The one you have in the 4500 range would be about 1963.
If you're going to shoot it, the bullets must be flush seated and if you are firing factory loads a 16 pound spring would be correct for the gun.
The gun can be fine tuned by going a little higher or lower on spring rates for the load you're using.
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Lynnie, Professional Pest
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