Federal power-shok 12 gauge sabot slug

The sabot slug meant to be used in rifled barrel. $15 a box, total of 6 boxes available. Rifled barrel prefers a specific type of sabot. Unfortunately this sabot does not like my barrel. Willing to trade other sabot, SST, federal copper. 4 boxes of this for 3 boxes of better sabot.

https://www.federalpremium.com/shotshell/power-shok/power-shok-sabot-slug/11-F127+SS2.html