Here is some feedback if anyone is interested.
Of course, I will give you the disclaimer that this is in my rifle and I will not be using it in my other one without working up. If you choose to use this data, you should do the same.
243 Winchester, with 80 gr TTSX, Coal. 2.61 inches, federal 210 primers, Winchester, brass, and h4350
I started at 40.5 gn and got 3023 ft./s. I carefully worked my way up to 45.7 grains with no pressure signs. The speed there was 3446.4 ft./s. Probably I will be using 45 grains as it looks like a promising node.
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