I don't want to drift off topic more than I already have ............ I find it very difficult to hit anything, anything if I am not off a bench and bagss or prone with a bipod. So I have practice and work cut out for me. A 25/26 - inch barrel is in the future for me, but not enough time and $ this season. But I should get an easy 100 fps over my stock 22-inch barrel.
Yes it should be faster. Short barrels can be fast too, just that you may have to use a faster burning powder in them.
I personally like heavier barrels on my hunting rifles for all positions of shooting. The heavier weight out front makes it more stable for me when firing off hand. Down side is the extra weight while hiking.
Key to successful offhand shooting for me is to only shoulder the rifle exactly when I'm ready to shoot and try to make the shot in under 4 seconds to avoid any fatigue.
I fire off hand with the rifle in motion, if that makes sense? So if an animal is staitonary, I'm swinging slowly from the bottom up and as soon as the reticle is where i want it, I "pull" the trigger like you would a shotgun. I may watch the animal or wait for a clear shot, but once i am ready the shot is taken very fast. Usually about 3 or 4 seconds from when I lift the rifle to my shoulder, get on target, and fire. If the animal is running, I'm watching for my opportunity, then as soon as I see it, I shoulder, swing with the target, and again pull the trigger like a shotgun when the reticle hits the mark. A good clean follow through is as important with offhand shooting as it is in any other position.
I have killed approximately 15 animals off hand with this technique from ranges of 50 to nearly 200 yards. A couple were standing still, most trotting along at a slow gait, and 5 of the animals were on a flat out sprint for their lives. All successful kills from the offhand position.
Think of it like shooting clays only you have one projectile. It's not hard. Just takes practice.
Eventually it will become instinct after you rack up a handful of kills off hand in the field. I only shoot off hand if I absolutely have to, but during about half of the kills, the entire event happened so fast I couldnt recall any sort of thought process that took place during the shot. In those cases, the shot was made purely on instinct. I could remember the whole event afterwards, but in the moment during the few seconds it took me to make the shot, my brain and body were on 'auto-pilot'.