The A series rifles started to be used in 1969.
The serial sytem was used on all the Savage guns put out after 1969 regardless of model. Exception would be the Canadian made rimfires, I don't think they used the A series on them. They still use the A series today, prior to that every model had their own set of serial numbers depending on the model.
I'd have no idea on the gun range guys 250 age unless I had a serial number or a pic.