Beer Smith Bitterness Estimate Help

[itsme6582]

I'm trying to input the following recipe from Orfy into Beersmith. I've got everything entered into Beersmith and I've input the data in kg and it's been converted to lbs. I've come up with the same numbers except for bitterness. Orfy's got 38.3 IBUs and I came up with 42.7. What would I look for that would change that number?

Orfy...
BeerSmith Recipe Printout - www.beersmith.com
Recipe: Burco Bodge Stout.
Brewer: Orfy
Asst Brewer: the dogs
Style: Dry Stout
TYPE: All Grain
Taste: (0.0)

Recipe Specifications
--------------------------
Batch Size: 23.00 L
Boil Size: 27.00 L
Estimated OG: 1.044 SG
Estimated Color: 28.7 SRM
Estimated IBU: 38.3 IBU
Brewhouse Efficiency: 80.0 %
Boil Time: 75 Minutes

Ingredients:
------------
Amount Item Type % or IBU
3.00 kg Pale Malt, Maris Otter (3.0 SRM) Grain 72.3 %
0.75 kg Crystal Malt - 60L (Thomas Fawcett) (60.0 Grain 18.1 %
0.15 kg Black Barley (Stout) (500.0 SRM) Grain 3.6 %
0.15 kg Chocolate Malt (Thomas Fawcett) (508.0 SRMGrain 3.6 %
0.10 kg Barley, Torrefied (1.7 SRM) Grain 2.4 %
30.00 gm Styrian Goldings [5.00%] (75 min) Hops 15.8 IBU
30.00 gm Styrian Goldings [5.00%] (60 min) Hops 15.1 IBU
30.00 gm Styrian Goldings [5.00%] (15 min) Hops 7.5 IBU
1 Pkgs Yeast Cake Yeast-Ale


Mash Schedule: Single Infusion, Batch Sparge. - Hot
Total Grain Weight: 4.15 kg
----------------------------
Name Description Step Temp Step Time
Step Add 10.83 L of water at 81.0 C 70.0 C 60 min


Notes:
------
Winged Recipe.

 

[itsme6582]

and my input is...

Burco Bodge Stout
Dry Stout


Type: All Grain
Date: 12/29/2009
Batch Size: 6.08 gal
Brewer: Jojo
Boil Size: 7.14 gal Asst Brewer:
Boil Time: 75 min Equipment: My Equipment
Taste Rating(out of 50): 0.0 Brewhouse Efficiency: 80.00
Taste Notes:

Ingredients

Amount Item Type % or IBU
6 lbs 9.8 oz Pale Malt, Maris Otter (3.0 SRM) Grain 72.32 %
1 lbs 10.4 oz Caramel/Crystal Malt - 60L (60.0 SRM) Grain 18.04 %
5.3 oz Black Barley (Stout) (500.0 SRM) Grain 3.62 %
5.3 oz Chocolate Malt (Thomas Fawcett) (508.0 SRM) Grain 3.62 %
3.5 oz Barley, Torrefied (1.7 SRM) Grain 2.41 %
1.06 oz Styrian Goldings [5.00 %] (75 min) Hops 17.5 IBU
1.06 oz Styrian Goldings [5.00 %] (60 min) Hops 16.8 IBU
1.06 oz Styrian Goldings [5.00 %] (15 min) Hops 8.3 IBU



Beer Profile

Est Original Gravity: 1.044 SG
Measured Original Gravity: 1.010 SG
Est Final Gravity: 1.012 SG Measured Final Gravity: 1.005 SG
Estimated Alcohol by Vol: 4.24 % Actual Alcohol by Vol: 0.65 %
Bitterness: 42.7 IBU Calories: 43 cal/pint
Est Color: 28.7 SRM Color: Color


Mash Profile

Mash Name: My Mash Total Grain Weight: 9.15 lb
Sparge Water: 5.38 gal Grain Temperature: 72.0 F
Sparge Temperature: 168.0 F TunTemperature: 72.0 F
Adjust Temp for Equipment: FALSE Mash PH: 5.4 PH

My Mash Step Time Name Description Step Temp
60 min Step Add 11.44 qt of water at 170.5 F 158.0 F



Mash Notes:
Carbonation and Storage

Carbonation Type: Corn Sugar Volumes of CO2: 2.4
Pressure/Weight: 4.6 oz Carbonation Used: -
Keg/Bottling Temperature: 60.0 F Age for: 28.0 days
Storage Temperature: 52.0 F

Notes

from Winged via Orfy

 

[rocketman768]

Can't see anything that would cause the differences (unless you're using a different formula for IBUs, or the way of calculating the IBUs has changed). But, there's no way you'll notice that small a difference in bitterness (if it indeed exists) anyway. In fact, I read in some book (perhaps Designing Great Beers) that BJCP judges can't tell a difference of less than 5 IBUs with any accuracy.

 

[Scimmia]

Whole hops vs pellets?

 

[itsme6582]

Whole hops it is! I switched them to whole hops and the bitterness dropped down to 38.4. Thanks Scimmia.