I shot 80 rounds today, testing some H335 (well, WC844 surplus powder) loads under 147gr FMJ bullets. It shot better with the lighter loads (40-41gr), getting pretty consistent 1.5-2" groups. They opened up to 3"+ with 44gr, though I did also shoot a 1.5" group with the 43gr bullets. I am going to skip the 44gr ones next time and try again with some 40, 41, and 42" loads. The recoil pad definitely helps in the longer sessions!
I also shot a few <2MOA groups with the cheap-o "Monarch" ammo from Academy. I have a pic showing one 1.5" group and one 1.75" group, for three shots each. I only shot 10 rounds of that and I think the rest were at the gongs.
I still have a lot of improvement to do as a shooter, but I can tell I'm getting better. My wobble is down to about 1.5MOA probably as opposed to 2MOA, and I'm slowly working out my flinch. I honestly think the gun could do 1MOA with a better shooter or a better rest. But me on just a bipod is definitely not the most stable setup.
I also really need a better scope. The adjustments on my $30 Tasco are extremely inconsistent. Early in the session I was trying to actually "zero" the scope with some degree of accuracy. It started off like 4" high at 100 yards. I lowered it 12 clicks, which should have been 3" down, and then I remembered I wanted it 2" high at 100 yards, so I raised it back up 4 clicks. My next several groups ended up averaging like 1" below POA at 100 yards (which should have taken ~20 total clicks rather than 8 ), haha. After some fiddling I got it to stick around 2" high. Still, shooting the 12" gong at 200 yards was cake, and the 6" gong at 200 yards was pretty easy also. But, I'll probably be picking up a Bushnell sometime soon.
Last time I took it out, I was only able to shoot 3 shots before a squib (case lube error on my part--first time loading rifle cartridges) caused a stuck bullet and a truncated range session. I finally got to test the forend work I did today (opened up the front of the channel and put a washer under the lug), and it seemed to have done quite well compared to the first time out.
Accuracy didn't seem to change much with barrel heating or fouling. The barrel started getting hotter toward the end of the session because another shooter came so I started having to shoot multiple groups at once (plus some shots on the gongs), rather than going to check between every group or two. I shot a few of the 1.5MOA groups at the end of the session, actually.
I'll post pics of the groups of you're interested.
*edit*
Oh and these were rounds ~80 through 180 I believe. And if you were wondering, yes the barrel was chopped short (search terms: shortened , hacksaw , hacksawed ) using a cutoff wheel on an angle grinder. After filing it level, it is now about 16.4". So, I'm pleased to find accuracy has so far not been negatively affected (at least to the degree I could notice). Also, just as a side note, I was able to get one of the Monarch loads chronographed and it ran 2636fps, vs what I assume would be 2800-2850 out of a 24" barrel.