ok, so i was shooting the other night and took my stock off to check the trigger on my savage, when i put it back on the guy i was shooting with said we should check to see if the zero held. he said that once you pull the stock off the zero changed, im not buying it. it doesnt make since to me. so it did shoot different however my scope had came loose by then. so what gives will it stay the same or change when the stock is removed? i like to pull the stock to clean and oil the bottom of barrel and the trigger.