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moderate loads with fast to medium powders is a necessity. They are not built to take supercharged loads. In the case of very slow burning powders, the powder charge is still in mid burn by the time the bullet reaches the gas port. Instead of a long, high pressure curve, which allows a much more violent blast of gas into the mechanism, you want a short burn, with a quickly diminishing initial impulse.
With this particular rifle, your problem is not entirely about pressure. It is also about the pressure put upon the gas mechanism.
Those are wonderful rifles, there's no reason, IMO, to try to extract an extra 200 fps or so by using hot loads of slow burning powders.
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