Do you think this ram rod extending will cause any defects in accuracy?

Also I just bought the Ultimate Slam scope by leupold and was using 130grain equivalent in pellets of triple seven with the hornady sst 250 grn sabot. The drop is equal to the 2 pellet setting on the scope. Is this because my barrel is too short to burn all of the powder (26inch) to get the full velocity? I used 130 grains of 777 because I have been told by a gentlemen who has this rifle and who has done extensive load research that it is more accurate than 150grain.