I have had good luck with these. Hundreds of parts in both 6061 and 304SS parted off and still on the first insert. Using the same insert for both. Constant surface speed (about 80 FPM for SS), peck parting with 0.010 retract, about 0.040 per peck, 10 IPM feed, flood coolant.
Holder
https://www.westtool.com/default.asp...+2300849#tab-1
https://www.iscar.com/eCatalog/Item....FSTYP=I&srch=1
Insert
https://www.westtool.com/default.asp...+6002573#tab-1
https://www.iscar.com/eCatalog/Item....FSTYP=I&srch=1