MMM- I have to ask "what is the felt recoil reduction with forward expelling holes".
i ask because i was involved with a buddy who built his own brake 40 yrs or so ago before they were not more than a mention in a couple of gun mags. It was a very "untried concept" back then and a lot of different concepts were tried by us on a lot of proto-types including hole numbers, hole sizes, hole angles, different muzzle clearances, and so on.... a lot of chips were made until we decided on a working "effective" model.
We found no design with forward expelling holes made any difference in rearward thrust of the rifle (.32-378 WBY) no mater how many holes were drilled in fact we thought we could notice the exact opposite of what a brake is supposed to accomplish. It might have been an imagined increase in backwards thrust but for sure there was no lessening the felt recoil in the least....yes back-blast & noise was certainly directed away from the shooter by forward holes but we could achieve a lot better with no brake at all.
Basicaly we could not feel any recoil reduction until the holes were pointed rearward. With the brake design that we finally used, felt recoil from that rifle is in the .243 Win class....but that damn muzzle blast is atrocious.