OK not bragging but 1" at 100 yards off bench with SRH 44 mag 9.5" and 2x6 (on 6x) Bushnell scope on B-Square (customized) full weaver,, 1.75# trigger with some serious sear work (had to get the pun in there).
All day long on a good warm calm day.
NOW to explain,,,, I have shot 100's if not 1000's of rounds through this gun and most of them through a Chrony. I have yet to shoot a factory load in this gun.
The load I shoot @ 100 yards is a 300 grain Nosler with 20.5 grains of H110,,,, This is a COMPRESSED load and to get down to the crimp groove you will see some deformation of the lead head, I use Lee carbide dies.
They kick like hell but they fly straight.
I had some 180's a guy loaded and gave to me to try and they were almost as good as my 300's @ 100 yards he never told me what they were and I have never been able to duplicate them.
My experience is the fuller the cartridge is the better so choose powders that accomplish that,,, some guys even use fillers.
If you shoot factory loads you may as well have a SLING SHOT!
Also I use a large (24" x 24") target with broad width cross so it's good and visible through the scope. I draw it with a chisel tip Sharpie.
Used to have a Burris 3x9 EER on it but had a LOT of trouble keeping the scope in place do to the recoil and the fact that scope was HUGE. That was before the weaver mount so 2 rings is all I could do,,,, I think you could do fine with it by just adding a third ring.
So in short if you can't do 1" at 100 yards you need to try a different load,,,, any experienced hand loader knows even slight change in powder weight makes a hell of a difference in accuracy sometimes and different powders (and batches) WILL make a hell of a difference.
If you don't have a chronograph you are wasting your time since consistency in speed is KEY.
Also you can have a load perform great in one gun and not worth a crap in an identical gun. It's all in how much time you put into it and maybe a bit of luck.
If I can't get a load in 2" at 100 yards in 6 shots I scrap that recipe and try the next variation. I'll load a MTM box full of 6 each of different variations, go out to my bench, set up the chrony and blast away and hope I find something worth keeping. ALWAYS keep careful notes on your loads just in case you get a good one you can duplicate it. When I get a good load I'll load up a few hundred rounds from the same batch of primers and the same batch of powder.
6 shots at 50 Yards should look like one big hole at worst, at best it should look like one fired shot.
But then if you can't shoot straight don't blame the tools.
My friend can't hit 8" at 50 yards with my gun and ammo,,, BUT don't go quail hunting with him because he'll hit as many as the shells he has in the gun and I've seen just 2 wings fall out of the sky before,,,, the bird was vapor,,,,,,,, I said "Maybe let them get more than 10 feet away next time!"
I just start shooting when he's out of shells,,,,,
Go figure huh!!