  In the last few years, a new type of Nb$_3$Sn superconducting composite,
containing a high density of artificial pinning centers (APC) generated via an
internal oxidation approach, has demonstrated a significantly superior
performance relative to present, state-of-the-art commercial Nb$_3$Sn
conductors. This was achieved via the internal oxidation of Nb-4at.%Ta-1at.%Zr
alloy. On the other hand, our recent studies have shown that internal oxidation
of Nb-Ta-Hf alloys can also lead to dramatic improvements in Nb$_3$Sn
performance. In this work we follow up this latter approach, fabricating a
61-stack APC wire based on the internal oxidation of Nb-4at.%Ta-1at.%Hf alloy,
and compare its critical current density (Jc) and irreversibility field (Birr)
with APC wires made using Nb-4at.%Ta-1at.%Zr. A second goal of this work was to
improve the filamentary design of APC wires in order to improve their wire
quality and electromagnetic stability. Our new modifications have led to
significantly improved RRR and stability in the conductors, while still keeping
non-Cu Jc at or above the FCC Jc specification. Further improvement via
optimization of the wire recipe and design is ongoing. Finally, additional work
needed to make APC conductors ready for applications in magnets is discussed.
