can we identify this

I was given a box of ammunition and was told that it was supposed to be Carcano.
Looking in Hornady 9th edition ruled that out.
Without posting a picture, I will try to describe this.
1: it is military
2: rimmed case rim is kind of rounded like a 7.62 x 54r rim diam .528
3: 6.5 mm or .263 dia. projectile
4: dia under head .452
5: dia at shoulder .424
6: length at shoulder 1.640 approximately
7: brass length 2.125
8: neck length .340 Approximately
9: headstamp is military and is marked in four places 1:43 2: am 3: s with what appears to be a cross behind the s 4:15
10: bullet is round nose and is extremely long for caliber: it sticks out of the case about .940. I did not weigh the bullet as I don't want to disassemble at this time.
11: primer is crimped, but don't see signs of sealer

some are packed in tan colored (natural colored) cardboard boxes with 30 rounds per box. No markings on box.

May try to post picture later

6.5x53R Dutch. I'm guessing.

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Its not carcano they are rimless like an 06.

Yeah, get us a picture...worth a thousand words.

Definitely sounds like 6.5x53mmR, used by the Dutch and Romanians. its also known as .256 Mannlicher.

but a picture is required to be 100% certain.

I went to the lgs today and they had some interesting information. This is indeed a 6.5 x 53.5r Dutch and I believe is also known as a .256 Manlicher.

Not only did two of the guys there knew what it was, they have a guy who works there that has a Mauser "71" that uses that round.

I hope he is interested because I have 150 rounds of them.

Thanks for the replies, guys. There is a lot of information on this forum.