I have to weigh in here. I’ve read the Browning explanations and have experience with an Eclipse 1000. First there are two boss’s (BOSS and BOSS CR(Conventional Recoil)) offered by browning. One is ported while the other is not, but their mass is the same. The ported version will reduce the felt recoil to approximately that of a 30-06. This really is not that important when you look at the weight of the Eclipse 1000. It is a hoss, big and heavy. Use the ported boss at the range with hearing protection (plugs and muffs in this case) to zero in, then change to the non-ported version to verify point of impact and go hunting. The important thing about the boss is the adjustable weight at the end of the barrel. Think of it as a counter balance or tuning weight. By miniscule adjustments you can change the harmonics of you barrel. Now, why is this important? You pick the ammo or hand load and tune your gun to that particular round. Ever had a riffle that just would not group with the round you wanted to use? With in reason, that situation is eliminated. You don’t have to be a dedicated hand loader that spent hundreds of hours for the perfect round-rifle combination any more. Buy the rifle and about five boxes of yor favorite ammo from the same lot number, and then hit the range. My brother has an Eclipse 1000 and has shot several weights and brands of ammo from it and has yet to find one he can’t tune to ¾” at 100 yards. His current favorite is the horaday ammo and I’ve seen his ¾” at two hundred yards groups with this combo.

PS Anyone with an old boss can call browning and get the BOSS CR (Conventional Recoil) to eliminate the extra muzzle blast in the field


Mike