New Barnes Tac-TX 6.5mm offering

[A5BLASTER]

Here is the entire data sheet from Barnes.

Bullet Weight Bullet Type Bullet SKU Bullet S.D Bullet G1 B.C Cartridge O.A.L
115gr. TAC-TX BT 31142 0.236 0.387 2.185

Minimum Maximum
Charge Velocity Charge Velocity
Powder (grains) (fps) (grains) (fps)
RL 10x 21.4 2154 23.8 2378
PP 1200-R 23.5 2262 26.1 2480
Benchmark 24.3 2241 27.0c 2483
X-Terminator 24.6 2265 27.3c 2489
8208 XBR 24.4 2264 27.1c 2498
RL 15 24.3 2279 27.0c 2511
H335 25.2 2279 28.0c 2519
A-2460 25.8 2250 28.6c 2551
*CFE 223 27.5 2350 31.0c 2660

What barrel length did they say that data was from? 24,22,20,18,16? I'm thinking 18 or 20 inch.