This is a great thread! Prior to my first trip to Africa, I was doing more bench rest shooting than hunting or offhand shooting. As a Kid all of my shooting was offhand and I was good at it. But, shooting skill is a perishable skill and without regular practice we lose some of the edge. Over the last dozen or so years, I have been hunting deer and squirrels with a monopod and find it to be a game changer. It easily doubled my effective range with both the 270 Mauser and the 22lr.
For Africa, I got tripod sticks and began practice. I was terrible at it, lol. at 200y I was lucky to hit a pie plate. My two Safari rifles were as you said about 1-1.25" for the 308 and about 1.5-2" at 100y for the 375. Since I was not expecting to shoot past 300y and really planning to keep shots inside 200-225y (Limpopo).
Still, 10" groups at 200y seemed to me to be inadequate. I went on a quest to improve. I found that my 375 had a huge amount of coper fouling in the last 8" of the bbl. After a concentrated cleaning effort I was able to use some precision rifle cleaning techniques to polish out most of that fouling. The groups shrank to sub 1" at 100y. Better. Same treatment on the 308 did not yield much as it was already more accurate and less fouled. I tested several ammo options and settled on 180g Fusions for the 308 since my rifle failed to stabilize the 180g A-Frames. I settled on 300g TSX for the big gun. But it shot the A-Frames equally well. I practiced with both about every two weeks at the range at 200y and 300y off sticks. My groups off sticks are easily 2-3x larger at 200y than off bench and 7-8" at 300y but more football oblong in shape.
Since shooting 375HH factory ammo every day gets pricey, I set up a 35y range in my yard where I would shoot 10 shots of 22lr off sticks with my suppressed squirrel rifle. My tgt was 1/2" Dum Dum suckers planted in a large earth berm in my pine grove near the garage. This shot is ballistically similar to shooting 175y off sticks with the 308 at a 2-3" tgt. After lots of practice, I could hit and break all five Dum Dums with only 10 shots and on a good day hit all five with 5-6 shots. I did notice that my performance varied from day to day. It helped me to build the muscle memory to quickly mount the sticks and send the shot. That practice did translate to better on stick shooting with the big guns as well. I don't recall ever shooting better than 3" groups with the 308 at 200y and 3-4" with the 375. So, for me whatever groups I could do on a bench I expect those to be 2x larger off sticks.
So, results? The deer season prior to my Safari, I hunted with the 375 just to get field time with it. I had a 40y chip shot on a nice 8pt that I missed because the little 1.5-4x Leupold was inadequate in low light. I did bear down and kill the deer at 60y with the 2nd shot off sticks. An under whelming performance. That led me to replace the scope with a much better 1-6x Z6i with illuminated red dot. I used that rig in Africa to take a huge Blue Wildebeest at 180y off sticks and I was as steady and confident on that shat as any I have ever taking off the sticks. I took an Impala at 160y off sticks with the 308 as well. That being the longest shot with the 308 from the sticks. I took a Gemsbok at 202y but it was not from the sticks since I had a better rest available from my position that time.
Sticks are not as solid as a bench but better than offhand in my opinion. Practice with the rimfire is a proven method to improve one's performance. If you have a rimfire that is similar in layout and weight to your hunting rifles, that is a plus. Finally, for this year's hunt, I upgraded both rifles to pieces capable of 1/2 moa at 100y with my chosen factory ammo. That should improve my on stick groups proportionately. I am now finished with the rifle/ammo/dope verification phase of my hunt prep. Took a nice 10pt buck off sticks last fall with my PG gun. 125y, one shot and flop. Shot was a little high but I did not have time to range it. Been hunting coyotes off sticks but they have not been cooperating.
Just getting into my on stick practice with both the hunting rifles and the rimfire. It is a process but is much of the fun of planning a big hunt.
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