How to check OG in a partial mash?

[Pelican521]

I usually just check OG at then end of my boil with extract added. I'm doing a brown ale and want to check my mash efficiency so I can adjust how much dme to add to be on target to my OG in case of bad mash efficiency.

I do a full boil, so can I do my mash and top up the kettle to 6 gals and take a reaDing?

I'm thinking I could remove the dme in my beer smith recipe and it would give me the OG just for my grains to compare. Will that work?

Thanks in advance.

 

[Dirt_McGirt]

That sounds like the way you'd do it. I haven't, but the way you describe it should give you a comparison from which you could extrapolate efficiency.

 

[Pelican521]

Thanks. I'm doing an American brown and want to make sure it doesn't turn out being a mild

It sounded like a logical way to figure out efficiency to decide how much dme to add.

Of course my wyeast 1968 ESB may have other plans...

 

[Pelican521]

This worked perfectly. I found I was 6 points under my predicted mash OG so added an extra 1/4 lb of dme to my recipe and got my 1.060 OG I was looking for.