No. 3  Second Version 1889-1940
Seen in 22 - 50 calibers
38 L. I. L. (Long Inside Lubricated)
This is from the April 1993 American Rifleman "Second Shots" under the heading of "100 Years Ago"
and came with the set.
32-44 S&W
32-40 R[emington]
Caliber .303 Savage.   Rare adjustable die version made for Savage Arms.
28-30 Stevens as seen on eBay.
25-21 & 25 as seen on eBay.  Usually seen only in the small die version.  This one is standard.
These dies will fit the current Lyman 310 handles.
The present owner believes this to be a No. 8 with the mould ground off, as so often shows up.
But . . . the No. 8, as far as is known, was never issued with an adjustable die.
On the other hand, the few No. 3s seen in this caliber have the standard "blunt" bullet-sizing plunger,
with the tapered point version seen only in the No. 8.
Note the very early die ID number: "40-70", with the "40" being Ideal's reference number for the caliber
and "70" being the bullet design.

Photos courtesy D. Elliott
I believe this recent photo proves to me, anyway, that the tool is a No. 3 with the tapered point bullet-sizing stem.
Nice Find!
Courtesy M. Vasseur
Interesting markings on this one - another "First time I've seen one like this".  
Die marked "303 S A", so it is assumed to be a factory item
in the typical Ideal "make it do" fashion.