Yeah, sorta like the lube grooves in lead bullets from the 1800's.The TXS is a new concept relatively speaking.
I'm thinking he's meaning MRX. Which is more akin to the old Failsafe.BTW, the TTXS is constructed closely to the partition without lead.
PS- It'll be interesting to see how Nosler's new E-tips do. I'm thinking they'll be putting a decent sized dent in Barnes sales.