My LHBS only carries Crisp Roasted Barley 500-600L
That big a variation is what makes it tough to know how much to use. 100 lovibond difference is huge. I'd use something like Blackprinz (500L) or Midnight Wheat (550L) which have a more consistent L rating. Just add it into your software until you hit 13 SRM.
Right. The variation is all over the board depending on where you look. I have actually seen ranges from below 475L to 625L Considering the small amount, the lower ends of the ranges gets me 12.8 and the higher gets me 14.1 so we're not talking about a crazy difference.
I do want that ever so slight roast so I don't think BP or MW will give me what I want. If I am strictly worried about color, I could just remove the roasted malt and adjust with some darker crystal.
Yeah, I didn't think about the slight roast for Irish red, I was just thinking in terms of dialing in the color accurately. My bad.
It's all good. I appreciate all input. I am overthinking this as usual. It seems best to just stick with what I got and see where I end up. If there are future batches, I can adjust accordingly.