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And as far as the twist rate not being fast enough, it specifically says the 105gr A-Max will not stabilize in a 1:10 or slower twist barrel but nothing about the match, and if it DID include the match, I'm still faster than 1:10 AND it shoots 100gr factory loads just fine.
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Twist rate and velocity are co-dependent for bullet stabilization, especially in marginal applications.
If you don't have enough velocity, even a 1:8" or 1:9" twist rate won't stabilize that 105 gr bullet.
Using a more standard OAL (2.700" to 2.760"), work that load back up from 37 gr to 41 gr of IMR 4350, with a standard LR primer. I would suggest 0.3 gr or 0.5 gr increments. If you run into pressure signs, stop. Otherwise, keep increasing the load (up to 41 gr), to see if you reach a point where the groups start shrinking.
It also wouldn't hurt to take a close look at that suppressor, to make sure it isn't causing problems and hasn't been damaged.
Velocity/twist, in general -
As velocity increases, twist rate can decrease.
And as velocity decreases, twist rate can (or
must) increase.