An extensive diversity in the formulation of HTPB-based solid fuels with metal additives has now been accepted in rocket and missile applications. Boron, which is a metalloid and often occurs in compound form has maintained its dominance mainly due to its significant theoretical energy potential. Therefore, it is preferred as the primary choice for rockets and solid fuel ramjet (SFRJ) or ducted rocket (SFDR). In this paper, performance enhancement of B-HTPB-based solid fuel is assessed through a rapid screening tool which is called an opposed flow burner (OFB). Screened fuel combinations may be further evaluated in the gas generator of a ducted rocket (DR) to fulfill the intention of the present investigation. The baseline fuel (B-HTPB) is included with a metal fuel/catalyst (iron) with the expectation that it would enhance the combustion performance of boron. Boron iron loading has been taken 10% of the total sample weight (wt.) giving a wt. ratio of 90: 10. Pure oxygen has been used as an oxidizer which impinges on the fuel surface where oxygen mass flux (G(ox)) varies between 20-57 kg/m(2)-s. In this study, the research focuses mainly on regression rate and amount of residual active boron in the condensed combustion product (CCP) of the samples. Addition of iron to B-HTPB increases the regression rate by around 12% and active boron content in CCP reduces significantly to 2.5% compared to 16% of the baseline fuel. In addition to that, the heating value of the fuel samples and identification of gas phase intermediate species (OH, CH, C-2, BO, BO2) are the other vital investigations undertaken in the present study.