Remington Accelerator sabots were always an off white/putty color, sort of like the cases on IBM computers in years past.
If the sabots were handloads, they were most likely purchased from Midway or another company like that. I remember sabots being offered for sale in the 1980s for a variety of calibers.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.