How do you know my kitchen scales or your scales are accurate? To within 50g? And if they are accurate, does a 50g weight difference affect anything?

I have weighed on my 20yo kitchen scales if it's any help:

GAII small 330-340g
Bell road med 270g
Bell Star no visor small 270g
Bell Star with visor small 295-300g

It's a good idea. I'll bring my LG P-06 (large w/ visor) into work and stick it on the postage scale.

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Using a Park DS-2 scale, my Arrowhead large is 514 with visor. Specialized TT2 large is 422. 92 grams difference. Using the old "a pound is worth 4 seconds in 40k at a 40k/hr pace", the increased weight costs me about 0.8 seconds. As long as the Arrowhead is faster than that (and I suspect it is), I'm happy with the purchase decision. And I get MIPS... But I rarely race my bike for more than an hour and I can suffer a bit. I can see needing to adjust to the extra weight if you're racing half or fulls.

My suspicion is that the variance is size based. Most companies probably publish weights for size small. I like it when they publish weights by size, but as long as customers make the purchase decision on weight, there's not much incentive to do it.

specialized EVADE size M 271 gr. (CE version)
specialized EVADE II size M 252 gr. (CE version)
specialized EVADE II size M. 287 gr. (US version)

please note that SNELL (US) certified helmets are always a little heavier

i can add now:

Smith Podium Size L 424 gr
MET Drone Wide Body Size L 471 gr

Smith Podium TT Medium with Visor 411g