Regarding MV and barrel length. The hornady 108-110 (sincle) page has a barrel length table that shows MV gain/loss per inch of their loads. You can get a feel for a similar load of yours there.
That said, the smaller case capacity rounds, and the powders they use, like the 6Arc and grendel, tend to run out of gas when the barrel gets too long, usually beyond 24" I doubt if you see the improvements you want. Being able to load a bit longer, allowing more fuel (powder charge) and being able to take it up to 60 ksi, will give you some extra. But face it, it is a small case.
For a 20" barrel, 2780-ish is a node, the next one up is ~2875. These nodes have a little bit of bandwidth, is what I've found but your numbers should line up close to these. Some of this depends on whether the powder and bullet can get you there without over-stressing, and staying less than "over-compressed" - on this last I've seen people talk about 103% fill but I don't like to go there, maybe 101 effectively but that's about as far as I would go... come to think of it, I try not to stretch out even that far over 100 (listening for the crunch when seating).
For a 22" barrel, those same nodes move to ~2820 and 2915 respectively. Again, dependent on whether the powder and bullet combo can get you there safely.
And this is "node movement" due to barrel length, not MV increase of same powder with a longer barrel. These 2 are not the same...
That said, the smaller case capacity rounds, and the powders they use, like the 6Arc and grendel, tend to run out of gas when the barrel gets too long, usually beyond 24" I doubt if you see the improvements you want. Being able to load a bit longer, allowing more fuel (powder charge) and being able to take it up to 60 ksi, will give you some extra. But face it, it is a small case.
For a 20" barrel, 2780-ish is a node, the next one up is ~2875. These nodes have a little bit of bandwidth, is what I've found but your numbers should line up close to these. Some of this depends on whether the powder and bullet can get you there without over-stressing, and staying less than "over-compressed" - on this last I've seen people talk about 103% fill but I don't like to go there, maybe 101 effectively but that's about as far as I would go... come to think of it, I try not to stretch out even that far over 100 (listening for the crunch when seating).
For a 22" barrel, those same nodes move to ~2820 and 2915 respectively. Again, dependent on whether the powder and bullet combo can get you there safely.
And this is "node movement" due to barrel length, not MV increase of same powder with a longer barrel. These 2 are not the same...