I can't get the same accuracy you guys show with my Howa sporter barrel .308, free floated hogue stock, and Nikko Stirling Gameking 3.5-10x44. I have shot SOME sub-minute groups. not usually.
So what's the problem, what your experiencing is NORMAL for MOST production rifles!
We shoot rifles almost every day, controled conditions and usually off bags or from a machine rest if the stock will fit in that old pos rest, but anyway, remember the rules...
First, we do not take to heart 'everything' we see or hear on the net, yes, even on forums!
And second, there are very few moderately priced, such as your Howa, that will one hole, time after time!
And third, like Taliv said, most all groups you'll see on-line will be the BEST of the rest, that was shot that day, not the 'average'.
If your getting ANY sub MOA groups, and the rest of the time your groups are within 'your' comfort zone, as to group size, buddy, you have the worlds best shooting rifle, right in your hands!
1.5" to 2" is about what a Howa will do(handloads excluded), there will always be the exception, we had one(Howa) through the shop the other day that was a solid .7" shooter(Federal Gold Medal Match), but those type of rifles from Howa, or ANY production manufacturer is a rarity, concerning a 22" or 24" sporter barreled, non bedded, normally produced rifle.
I think your doing just about as good as you can, under the circumstances, try different ammo, one is bound to do a tad better than the other, check and torque the action screws to 40 INCH pounds(Hogue stock), make sure you have no stock contact in the barrel barrel channel, try some handloads, got a good, clean barrel, concentrate of 'your' end of the shooting equation, you may wring some tighter groups out of your Howa on the average!