Any body able to shed some light on the following A savage 110L serial number 31289 in .270 cal... on underside of the barrel has a circle with 15L in it & another with SP.. I've pulled the barrel out of it, hardly used..I'm rebarreing it to 300 Whby mag with a stainless match grade barrel with Sendero profile, re using the early baffle on newer model bolt.. action still quite tight hardly any use apparently was stored in a cupboard for 40 odd years...