(snuffy and I posted at the same time)
Berry's regular plated bullets with solid bases are rated to 1200 fps and I use lead load data or start-to-mid range jacketed load data with good results.
The Hollow Base bullets have thicker plating (HB-TP) and rated to 1450 fps and I use jacketed load data with good results.
For accuracy loads, I have used FMJ with exposed lead base that will expand better to seal with the barrel. As Mike posted, Berry's Hollow Base bullets have longer bearing surface to better stabilize the bullet and expand to seal with the barrel for less high pressure gas leakage that produce more consistent chamber pressures (which in turn translates to greater accuracy).
IME, Berry's HBRN-TP loads outshoot my reference FMJ loads.