Yuck keep your extra inchs to yourself!
I do 2850 in an 18" now its plenty but a little more is always nice or the same but shorter.
GRT suggests 80kpsi would give 2950ish in a 16" with my same powder and bullet. Thats what I mean as well as higher pressure helps a more complete burn with slower powders in short barrels (according to GRT and QL) if you think it matters.
It also suggests that 2970 in a 20 is already in the 65-70kpsi realm. In most bolt actions pressure signs are often not seen until 70-80kpsi often higher
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