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Have you, by chance, any experience using IMR4895 with the barnes copper projectiles? I had been running 42 grains of it behind the Hornady 3715. It's been some time since I reloaded, but I have recently laid in a supply of the IMR. Perhaps I can find a 'conversion' for (x)N140 = (x)IMR4895.

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No, sorry! The other way around, I sometimes used 4895 data with N140 when nothing was available. Afaik N140 is just a bit slower burning, so reduce my load by about 5%.
I started using VV N140 about 50 years ago, when it was still named "Kemira 16" and came in small 200g, yellow tins. It was then the only rifle powder available to me. Later, the Vihtavuori powders were less pricy than all others and, even more important, always available locally. So there never was a reason to change a winning team. Additionally, here in Germany you are only allowed to store up to 3 kg = 6.6 lb powder at home. This makes experimenting with different brands of similar properties a bit difficult.
BTW, N140 being "temperature sensitive" is new to me.

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