On non-adjustable gas, then yes. Buffer weight doesn't change for gas nor add to the weight of the cycling.In my example it's the same rifle and only changing the bolts. NO, too takes more gas.
I will word it another way: Total weight. Weigh the skeleton BCG and a heavy H3 buffer weight. Lets weigh a full auto bolt with a added brass plug and it's Standard buffer weight with even a steel slug or two removed. They have equal total weight and both eject the same loaded shells to 3:00 - 4:30.
The heavy bolt is going to be moving slower as it takes up the air gap to the buffer weight, but it's striking a lighter object which moves easier.
The lighter bolt is going faster as it takes up the air gap and crashes into a heavier H3 buffer weight just beating up the front of it.
These two examples probably require a different spring to balance out an ejection pattern.
Just like my buddy with his cheap off the shelf AR. It requires a heavy buffer weight and spring to get the correct ejection pattern because it's also dealing with the added pressure of a short gas tube. These rifles figure that you are also going to be shooting cheap off the shelf lower pressure 223 rounds. Where as the well thought out brass slug gun can do thousands of trouble free rounds without ever replacing parts that just got beat to death. They also use hand loads with up near max pressure and were designed to balance out with small gas holes and long gas tubes.
AR-15 Ejection Patterns - Wideners Shooting, Hunting & Gun Blog
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This isn't hypothetical, it's factual on following statement(s).
With an agb where it's tuned to the correct ejection pattern with a lighter bcg (spring and buffer are not important at this time although required) will need less gas. Now snap in a heavier bcg and it will short stroke. If something is "crashing" into the buffer it has to much gas. If you use a non-agb (gas port being at optimal size) using a lighter bcg, the use of a heavier buffer is needed (not necessarily a stronger spring).
What you have found in your test seems to be different than what I've tested.
Test done with pmc m855 and m193 in 5.56 and wylde chambers. Test done in 6.5creed AR10's used Hornady match 120a-max. Test in 308win AR10's used pmc bronze 147gr (m80) 7.62x51.
I haven't done any in 6.5gren, 300bo or 6.8spc2 yet. Test is uncomplete on 260rem AR10's and 7-08rem.
