Gunner; both are grand bullets. I have no experience with the AFrame in .257 but have used it extensively in 8mm. I have used the Barnes extensively in a variety of calibres including .257 and the 8mm.
I have done head to head tests with the Barnes 180g and the AFrame 200g in 8mm
So based upon experience on game in tests in other calibres I would suggest that the Barnes bullets penetrate as well as lead core premium bullets which are a step up in weight.
Based upon that I would extrapolate that in your case the Barnes would have slightly greater penetration.
Maybe grab some paper before it hits the recycling bin, pack it tightly, soak it, stack it at least 24 inches thick and shoot it at 50, 100 and 300 yards with both bullets. Measure penetration and “wound channel”. Take pictures and post results 😃 You’ll likely find slight but measurable differences.
