Mate I went down exactly the same journey... I'm shooting 150gr SST, 44.5gr 2206h from my 20" barrel plus can. Not quite getting a complete burn but close to it and under MOA. Rem700. 2690-2700fps. Not super fast but a good balanced load that is hitting gongs out to 600.
Remember too that you've accepted some velocity loss with a shorter barrel.
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