7.62NATO
I was cautioned by the owner that if you are using bullets where the tip sits at or below the sabot (like the T/C Cheapshots), the texturing on the Original Spinjag COULD conceivably grab the the sabot once seated and you are withdrawing the ramrod.
I have been using the 'original Spin Jag' since it came on the market. I also use HPH-24 sabots that are longer than some of the bullets that I use. The Spin Jag does not touch the sabot. Mr. Gunn specifically designed and tested it for just that possiblitly.
Other jags on the market then and now can do exactly what you are indicating...