filler and flux specs

as listed here:
SIF SILVER SOLDER No.43 (Cd free)
BS: 1845 AG14

CADMIUM FREE 55% Silver Solder, which is free flowing and ideal for close fitting capillary joints and for colour match on stainless.
1.5 mm diameter; melting range 630-660°C (1166-1220°F); typical composition 55% Ag, 21% Cu, 22% Zn, 2% Sn

their Cadmium-bearing No. 42 solder (42% Ag, 25% Cd) melts at a temperature about 30° F cooler and has slightly higher tensile strength.

as listed here:
Gasflux Type U white paste flux is effective from 565-870° C (1050-1600° F).

as listed here:
Wolverine Silvaloy A45 (45% Ag, 30% Cu, 25% Zn) melts between 1225° F and 1370° F.

i'm planning a trip down to the Airgas store near me for from Harris black flux (sorta cheating, this is getting frustrating), maybe some Harris 56% filler, and thin leather gloves (filler is tought to pick up with welding gloves, and i'm not yet very experienced with the torch).

as listed here, Harris Safety-Silv 56 has a different makeup than the similar Sif product: 1 percentage point more Ag, 1 pp more Cu, 5 pp less Zn, 3 pp more Sn. i could see that making a bit of difference, especially the extra tin. and i only have a couple troy oz. of Sif left because i've been globbing it on so much, so i need more anyways.
oh, the Harris spec sheet pdf lists a melting range of 1145-1205°F for Safety-Silv 56, about 20° F lower than Sif 43. will that be noticeable? i'll report soon.