Remington Arms Co. stamped the actual pellet counts of their test patterns on the rear barrel lug of their Model 1889 hammer doubles and their Model 1894 and 1900 hammerless doubles. If the number is three digits, that is the count, if the number is two digits a leading 3 is implied. From surviving hang-tags we know the standard load they used to target 12-gauge guns was 1 1/4 ounces of #8 going 511 pellets to the load. Looks like 300 for the right barrel and 343 for the left barrel -- 300/511 = 58.7 % right and 343/511 = 67.1 % left.
From surviving Remington Arms Co. hang tags we know the load they were using in 1901 was Load No. 8 in the UMC SMOKELESS shell --
Later Remington Arms Co. hang tags show 12-gauge guns being targeted with UMC NITRO CLUB shells Load No. X8 with 24 grains of Infallible powder.
All the above being said, I wonder if that 7 next to the 2 7/8 on the left barrel might indicate this gun was targeted with No. 7 shot?
Could the dot below the 7 mean No. 7 1/2 shot? DEO-Grade 135127, sold a while back by Julia's, has its hang tag with it which had the No. 8 Chilled Shot typed over with 7 1/2 and the barrel lug with the pellet counts has a 7. stamped on it? Lots of things to speculate about on these made to order Remington Hammerless Doubles.