Rifle in pictures is a 416 Ruger Hawkeye African model with 24" barrel.
Front of Shoulder Carry, notice gun is nearly vertical in front of shoulder carry, with gun barrel behind my ear and out of field of vison unless I am looking over my shoulder.
Back Of Shoulder Carry. Note gun barrel is tilted back, which is great for crawling on all fours in a stalk, or when climbing steep terrain.
Belt position is the most forward position on my Kifaru belt. Gun Bearer is also adjusted as short as possible and mounted in the upper molle strap position to keep the butt of the gun stock as high as possible so it does not impede walking or climbing in this forward position, since it is in front of my hip. In this forward position, it is effortless to retrieve the rifle or put it back in the KIFARU Gun Bearer without removing pack. This forward position also keeps rifle almost vertical in the front of shoulder carry position, which means the gun barrel is behind my ear and well out of my field of vision even when carrying on front of shoulder.
My go to hunting outfit, KUIU 4000 PRO LT pack and KUIU shoulder straps in Verde camo, EXO K4 frame and K4 lumbar pad, and KIFARU Duplex belt and Gun Bearer, and SLIK SLING rifle strap on KUIU shoulder strap. Pack is all compressed down and wrapped up in storage mode.
With EXO lid.
SLIK SLING rifle strap connected to EXO K4 frame carry handle.
SLIK SLING rifle strap, pack storage mode.
SLIK SLING rifle strap connection post mounted on KUIU shoulder strap. Shoulder strap has a tendency to roll up around the connection post base when the base mounting straps are tensioned. I am going to try to fabricate a small carbon fiber panel the width of the shoulder strap so that when I draw tension on the connection post mounting straps, the shoulder strap will stay flat, and the connection post base will be a more rigid and secure fit to the shoulder strap.
Front of shoulder carry is a little more inconvenient/uncomfortable with a big rifle scope. I say a little more, I can still easily carry on front of shoulder all day with no fatigue issues. In front of shoulder carry, the rifle scope is always under your arm, so scope may be a little more protected in front of shoulder carry. I really prefer back of shoulder carry in most circumstances when the gun is not in my hand. It feels very similar to carrying a rifle in a traditional rifle sling as far as the position of the rifle, but it is MUCH more secure, never slips off my shoulder and there is NO WEIGHT bearing on the shoulder. The weight of the rifle is almost unnoticeable on the KIFARU belt, even my heavy African hunting rifles. My arms and hands are more free with the rifle behind the shoulder, it is more comfortable, and I can really access the gun about as fast from either position. Gun retrieval is similar for time compared to using a traditional rifle sling.