In femtosecond laser inscription, the multi-scan technique has already proved to increase the refractive index change associated to the embedded structures for both low and high repetition rate regimes. However, for the latter case, the thermal effects induced by the subsequent absorption of the laser pulses tend to tightly narrow the DLW window for smooth type I material modifications, making it difficult to control the refractive index change. On the other hand, femtosecond laser inscription of silver-sustained (type A) refractive structures in silver-containing glasses with high repetition rate was recently shown to occur in an athermal regime. The present work shows that this remarkable athermal regime, in combination with the multi-scan technique, enables for achieving high type A refractive index changes, up to 1.3 x 10-2, in a commercial silvercontaining glass.