While looking for the buck, they spotted a herd of doe and Roman pointed his rifle at one, court records said. Does were out of season at the time.
The two men struggled over the rifle, which Round was able to wrest away, records said.
Defense attorney William C. Costopoulos of Cumberland County, Pa., says Round acted in self-defense.
Round told Pennsylvania State Police that he thought Roman was going to shoot him, police testified during a preliminary hearing in December.
When Round told Roman not to shoot the doe, Roman called him a name, lowered the gun and turned toward him, police testified.
Round said he took the rifle away from Roman and hit him five or six times, police testified.
When Round was arrested later that day, he had a wound above his right eye and dried blood on the right side of his face, police said.
But Franklin County District Attorney John F. Nelson has argued that the beating was too severe to be self-defense.
Roman's rifle was found in three pieces. The stock was lying beside the victim, the rifle barrel was lying on a flat-bed trailer in Round's driveway and the scope was behind his house, police said.
An autopsy of Round's body showed he died of multiple head injuries, suffocation or both, police said.
There were three facial wounds and eight wounds to the head area, police said. One of the wounds penetrated the skull.
Round is free on $225,000 bail.