The gain for the regular screen is .85. They increased the gain to .95 for the perforated sceen because you lose some gain due to the holes. If you have a micro-perf then the gain is going to be higher. If you do not it will be .85
The rated gain of the non-perfed screen is indeed .85 for the Grayhawk. However, in testing they have found that it is actually closer to .90+. Stewart quotes conservative gains so that if it happens to be more you will get a bonus. Some other companies quote higher than true gains for their screens to hype them up more. Another reason Stewart is the best!
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