3800 fps in a 26" barreled 257 Wby is a hot load in my experience. In fact most I have developed loads for topped out in the 3650 to 3700 fps range with a 26" barrel, you must have a very fast barrel, but then that would not explain the low velocity of the 110 gr Accubond.
In all honesty, 3550 fps with the 110 is more in the reange of what the 257 Wby should be able to do with appropriate pressures.
Most do not realize that going up 10 gr in the quarter bore is like going up 20 grains in a 7mm bore. It makes a lot of difference as far as perssure goes. It can also require a change in powder to get the top velocity possible with the heavier bullet weight.
Working with my 257 AM I have found that the 257 bullets of different weights result in extremely different powder charges.
The smaller the bore the larger difference weight increases make on increased pressure.
Good Shooting!!!
Kirby Allen(50)