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Old June 10, 2021, 08:40 PM   #8
44 AMP
Join Date: March 11, 2006
Location: Upper US
Posts: 24,971
Slower powders get their best performance from longer barrels. Essentially, they push "slower but longer".

Gas operated actions are a balancing act of several factors at the same time, and are generally set up for the "common" load levels, in terms of both overall pressure AND port pressure. Unlike most piston systems, the direct impingement system of the AR design has somewhat unique requirements, and this is why adjustable gas blocks have become common, useful, and sometimes needed modifications to the original design.

I fully expect that if you run the slowest burning powders in an AR pattern .243 you will likely need to "tune" the gas system for best performance. An adjustable gas block seems to me to be the simplest and cheapest potential item to do that with, though you may also need to experiment with different springs and or buffers, as well.
All else being equal (and it almost never is) bigger bullets tend to work better.
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