High‐field critical current densities Jc and pinning behavior are discussed for Nb‐63a/oTi, Nb‐61.7a/oTi‐3a/oHf, and Nb‐64.7a/oTi‐7.2a/oTa superconducting alloys. Jc properties for 8–12 T in these alloy superconductors under superfluid helium environments can be even superior to those in Nb3Sn at 4.2 K, when they are heavily cold‐worked after final heat treatments. A temperature scaling law of the flux pinning force Fp is found to hold for these alloys in the form of FP=K [Bc2(T)]nbp(1-b)q, where Bc2 is the upper critical field and b≡B/Bc2. The peak reduced field, bm, in the Fp-b curve depends upon how the alloys have been processed. The origins of n, p, and q are discussed in terms of the processing condition.