What's the difference between these two factory loads?

[poihths]

Sinclair lists two Winchester shotshell types that seem to have identical specs: 12 gauge, 2-3/4 inch, 2-3/4 dram, 1-1/8 oz 7.5 shot, 1140 fps. Product codes are WINAA127VP and WINAA1275. One costs $2 more than the other per box of 25. What's the difference?

 

[rule303]

Same shell, the part number ending in VP is sold in a 100rd value pack.

 

[poihths]

Then Sinclair is doing something strange. Their price for the shells with the VP code is $9.99 for a box of 25 - not a box of 100 - and the price for the WINAA1275 is $7.99 for a box of 25. No mention of anything like a 100-cartridge value pack.