taking a look at vinnie cilurzo's zymurgy article that includes the pliny recipe,
in the extract substitution paragraph, he notes:
"Due to the large hop bill for this recipe, a full wort boil is recommended. Steep grains in 1 gallon (3.8 L) of water at 165° F (74° C) for 30 minutes, then remove and rinse grains with hot water. Stir in dextrose and top up kettle to 8 gallons"
so here's my question... the largest kettle i have presently is 30qt -- 7 1/2 gallon -- what effect might i see if i attempt the full boil @ 6 1/2 or 7 gallons instead of 8 ?