Some additional notes after my first attempt at cloning Pliny the Younger a few years ago. I emailed Vinnie at the time, but he hedged and said it was too complex and sent me the Elder recipe. Over time though I've pieced most of it together from various interviews, so here is the dirt:
My most recent IPA had an aroma nearly spot on with PtY (got to have them head-to head), but it was more PtE in terms of alcohol strength. It used Amarillo and Simcoe at the end of the boil (5 oz) and two 3 oz additions of dry hops (1 oz each Simcoe, Amarillo, Columbus).
For malt I would go with ~85% Pale malt, 5% Carapils, and 10% corn sugar (by extract). Vinnie has said that he doesn't use colored crystal malts in it as he does in PtE. Aim for 1.100, but remember to calculate for the losses to hops (also remember to aim for low eff due to the high gravity). I would mash in the low 150s to ensure complete attenuation.
I would add enough gypsum to get to ~150-200 ppm sulfate, that will help to accentuate the hop bitterness. If you have a lot of bicarb in your water you might also want to cut it with distilled since this is such a pale beer.
I would bitter with hop extract (or Columbus). I have yet to try extract but some people have claimed that NB's Hop Shot (
http://www.northernbrewer.com/default/hopshot.html ) is the same stuff Vinnie uses just repackaged. NB suggests 11 ml for 100 IBUs on a 1.100 beer. I would probably
go for 15 ml at 60 min since it is supposed to be a smoother bitterness than normal hops.
Here is the rest of my boil schedule after bittering, seemed to work well. The flameout hops were added over a couple minutes post boil as the wort was chilling.
1.00 oz. Columbus (Pellet 11.00% AA) @ 45 min.
1.00 oz. Simcoe (Pellet 12.40% AA) @ 30 min.
3.00 oz. Amarillo (Pellet 8.60% AA) @ 0 min.
2.00 oz. Simcoe (Pellet 12.40% AA) @ 0 min.
Ferment with American Ale (Vinnie uses WLP001). Vinnie suggests not pitching too many cells since they can uptake bitterness. Keep the fermentation cool, but let it get close to 70 at the end of fermentation to ensure complete attenuation.
Actual PtY: Dry Hop Schedule (per Vinnie). I would do 1.5-2 oz total for each addition, whole hops only. He rouses with CO2 to keep them in suspension (probably not feasible at home unless you have a conical). I normally just put them in a stocking and weight it down with glass marbles to keep them submerged and make taking them out easier.
DH 1 Simcoe, Amarillo, Centennial for one week and remove
DH 2 Amarillo, Centennial for one week and remove
DH 3 Simcoe for one week and remove
DH 4 Simcoe, Amarillo Dry Hop in Keg
Vinnie has stressed keeping yeast to a minimum while dry hopping, so you might want to crash cool and fine with gelatin before the first round. I would dry hop the first three rounds at room temp (another Vinnie recommendation). Then I would chill and force carb right after the keg hops are added.
Make sure to keep oxidation to a minimum, double flush everything the beer touches post fermentation with CO2.
I'm certainly planning on doing this myself at some point, but I'm not sure having a really hoppy best when fresh 11% ABV IPA on tap is the best idea in the world for my health...
Late 2010 I finally put my own advice to use and brewed another attempt at a
Pliny the Younger clone.