T101 Armor Piercing Incendiary (API)
T101 = 1.95" case, 140 grain bullet
T101E1 = 2.01" case 140 grain bullet
T101E2 = 2.01" case 140 grain 10 ogive bullet
T70 = T65 case, M2 bullet, 2 holes drilled in case.
T70E1 to T70E3 = 1.95" case, various bullets, drilled cases.
T70E4 = 2.01" corrugated or drilled case, 145 grain BT bullet.
T70E5 = 2.01" corrugated case, 68 grain hollow bullet.
As with all dummy cartridges, you can expect the unexpected. Reject cases and bullets, headstamps out of synch, extra cannelures, etc. For example, the T70E5 is supposed to be the prototype for the M63. But, you can find both the E5 and the M63 with a 145 grain bullet.