A process that uses an ebullated bed reactor system for the hydroconversion of a heavy hydrocarbon feedstock providing high conversion of said heavy hydrocarbon feedstock with a low sediment yield of less than 0.5 wt.% as determined by testing method ASTM-4870, wherein said process comprises: introducing said heavy hydrocarbon feedstock into an ebullated bed reaction zone contained within a reactor volume defined by an ebullated bed reactor vessel, wherein said reactor volume includes an upper zone above said ebullated bed reaction zone and a lower zone below said ebullated bed reaction zone; and wherein said ebullated bed reaction zone comprises a catalyst bed of shaped hydroprocessing catalyst particles having a geometry, wherein said shaped hydroprocessing catalyst particles have a trilobe shape having a trilobe particle length and a nominal trilobe diameter, wherein the geometry provides for a first ratio of the cross section perimeter-to-cross sectional area that is in the range of from 5 mm -1 to 8 mm -1, and a second ratio of the trilobe cross sectional area-to-trilobe particle volume that is in the range of from 5 mm -1 to 15 mm -1, wherein said shaped hydroprocessing catalyst particles are characterized as having a macroporosity such that at least 10 % of the total pore volume of said shaped hydroprocessing catalyst particles is in the pores having a diameter greater than 350 Å; contacting under hydroconversion reaction conditions said heavy hydrocarbon feedstock with said shaped hydroprocessing catalyst particles within said ebullated bed reaction zone, wherein said hydroconversion reaction conditions include a contacting temperature in the range of from 316°C (600°F) to 538°C (1000°F), a contacting pressure in the range of from 6.9 x 10 6 Pa (1000 psia) to 27.6 x 10 6 Pa (4000 psia), which includes a hydrogen partial pressure in the range of from 5.5 x 10 6 Pa (800 psia) to 20.7 x 10 6 Pa (3000 psia), a hydrogen addition rate per volume of heavy hydrocarbon feedstock in the range of from 356 m 3 /m 3 (2000 SCFB) to 1781 m 3 /m 3 (10,000 SCFB) and a liquid hourly space velocity (LHSV) in the range of from 0.1 hr -1 to 5 hr -1; and yielding from said upper zone a heavy hydrocarbon conversion product having a low sediment content of less than 0.5 wt.% as determined by testing method ASTM-4870. introducing said heavy hydrocarbon feedstock into an ebullated bed reaction zone contained within a reactor volume defined by an ebullated bed reactor vessel, wherein said reactor volume includes an upper zone above said ebullated bed reaction zone and a lower zone below said ebullated bed reaction zone; and wherein said ebullated bed reaction zone comprises a catalyst bed of shaped hydroprocessing catalyst particles having a geometry, wherein said shaped hydroprocessing catalyst particles have a trilobe shape having a trilobe particle length and a nominal trilobe diameter, wherein the geometry provides for a first ratio of the cross section perimeter-to-cross sectional area that is in the range of from 5 mm -1 to 8 mm -1, and a second ratio of the trilobe cross sectional area-to-trilobe particle volume that is in the range of from 5 mm -1 to 15 mm -1, wherein said shaped hydroprocessing catalyst particles are characterized as having a macroporosity such that at least 10 % of the total pore volume of said shaped hydroprocessing catalyst particles is in the pores having a diameter greater than 350 Å; contacting under hydroconversion reaction conditions said heavy hydrocarbon feedstock with said shaped hydroprocessing catalyst particles within said ebullated bed reaction zone, wherein said hydroconversion reaction conditions include a contacting temperature in the range of from 316°C (600°F) to 538°C (1000°F), a contacting pressure in the range of from 6.9 x 10 6 Pa (1000 psia) to 27.6 x 10 6 Pa (4000 psia), which includes a hydrogen partial pressure in the range of from 5.5 x 10 6 Pa (800 psia) to 20.7 x 10 6 Pa (3000 psia), a hydrogen addition rate per volume of heavy hydrocarbon feedstock in the range of from 356 m 3 /m 3 (2000 SCFB) to 1781 m 3 /m 3 (10,000 SCFB) and a liquid hourly space velocity (LHSV) in the range of from 0.1 hr -1 to 5 hr -1; and yielding from said upper zone a heavy hydrocarbon conversion product having a low sediment content of less than 0.5 wt.% as determined by testing method ASTM-4870.