I have a 416 Taylor with a 24" barrel and can share these results:
300 Barnes O 75.0 I4064 CCI 250 WW 3.358 2561 4370
350 Speer 83.6 H414 9 1/2M WW 3.358 2379 4399
350 Speer 83.6 RL-17 CCI 250 WW 3.358 2622 5344
400 Hornady 78.0 RL-17 CCI-250 WW 3.358 2316 4765
How does a 416 Taylor Improved...
If you can find RL-25, it's magic in my 25-05 rifles with both the 110 AB and the 115 BT.
3150 fps across the screens can be achieved from a 24" barrel and has punched 1" 5 shot groups at 200 yards on multiple trips to the range.