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That's the year where TW switched over from corrosive priming for ball ammo. So to be sure you would need to check the lot number as the change occurred mid-year. Not a big issue though, just clean as if it's corrosive and you will be fine.
I take a bottle of Windex to the range when I'm shooting corrosive. When done for the day flip the rifle stock side up with the muzzle pointed down and spray a good 8 -10 full squirts down the barrel. Shake a bit and case it up. Then clean as normal when you get home. Never had a problem in decades of doing this.
If you are really concerned, just do what the old timers did. Give the rifle a thorough cleaning as soon as you can on the day of firing. Finish with a heavy film of oil in the bore. Then, for the next two consecutive days run several solvent wetted patches through the barrel, dry and oil as before. No problem.
That's a great chart 415DET, thanks for posting it, I've downloaded a copy for my records. The chart differs than my info, but it was pulled from a poster on The Highroad website quite a long time ago. I'm sure your data is more accurate.
It will be fine … unless it was stored on the back deck of your car in summer! Govt. ammo is quality stuff. I'd be after your stash if you were closer.
FWIW I in the late 90's I fired some Mauser ammo that was head stamped 1925 … and it worked fine. I wish I had some of that for collecting reasons but it's long gone.
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