Your rifle is most likely a JC Higgens Model 50 sold by Sears. I used a 50 to convert to a 338 WM for my elk rifle and it has the "FN Action-Made in Belgium" on the left side of the receiver. I'll give you $300 for it right now. No better action to use for a custom rifle
. The trigger was the FN design,similar to the original pre 64 M70. You can easily replace it with a Timney.