Attention: TDR Forum Junkies 
GHarmin - You have to think of terms of the design application for this platform. Semiautomatic, double stacked magazines, 0 - 200 yards, 7 moa, or Minute of Man. They are capable of longer ranges and tighter grouping, but that requires skill on the operator (it's not the bow, it's the Indian), and certain tweaks to some of the components.
Your ammo comparison does point out the differences in quality of the factory ammo that is on the market. That's why all my ammo is home brew, I know I am +/- 1% on overall consistency with every round that leaves my press, which is reflected downrange. It also proves that rifles will get particular (READ ~ picky eater) in a particular brand and bullet grain (My MK12 does not like my M193 all that much).
Both of mine do leave scratches on the bullet upon feeding, I have not compared left feed vs. right. I don't get any burs however. Once I get my MK12 dialed in with the MK262 ammo, then I may start looking at the feed ramps and consider polishing to minimize or eliminate any marring of the bullet upon feeding. Right now I am more concerned with the SureFire muzzle brake and the pitting on the forward port dragging on the bullet upon exit.
After 700 rounds.
Here is one of my 10 shots @ 100y targets. My first assembly, 16" middy, Aimpoint PRO, firing prone off the mag (another point that used to be a no-no, but with the modern rifles it's a go), support arm on the handguard, not bracing/monopoding the stock.
I knew as soon as I pulled the trigger on shots 4 and 7 (low left and right) that I shanked 'em (Thanks Pat MacNamera - I can call my shots now
) - they are not "flyers". The Aimpoint is a 2 MOA RDS - so my dot, covers the 2" square in that target @ 100. I'd hate to try to duplicate that with a 4 MOA RDS.
Flying_gage - At the time that I wrote that, I had completed my first assembly and was mapping out my MK12.
Cost at that time was not an issue, so my components were going to be top 'o the line in quality, but minimal on the new and fancy wiz-bang crud.
I had looked at off the rack rifles, and the top quality brands (also referred to Tier 1 - a term I don't use) still had features or issues that I did not want, and customizing the rifle/carbine to my needs was an additional waste of money, and a growing collection of parts.
The point of that writeup was directed at the first timers to the evil black rifle. A simple cost/benefit analysis would be 2 fold (financial and emotional). 1 ~ getting a rifle that is of quality out of the gate, saving the buyer from either replacing the weak points on the lower quality rifles, or paying a gunsmith to do the repairs in the lack of quality control in the "cheaper" rifles. 2 ~ getting a rifle that is of quality out of the gate vs. the cheaper ones will leave the shooter with less frustration and distaste for the platform after experiencing the malfunctions and failures.
One could go out and buy a $600 rifle, a few magazines, a cheap Chinese RDS, and I'll wager within 250 rounds, they will start to see the effects of going cheap, and the frustration building. Rapidly diminishing accuracy, constantly re-zeroing, frequent jams.
A case in point, a buddy of mine who bought a Stag; The handguard was 3/32 shy of mating up to the receiver, who knows if the barrel nut was properly torqued, the receiver extension castle nut was not staked, and would have backed off, the gas key on the BGC was poorly staked and would have loosened up, unknown gas port size and buffer (time will tell on that one), the FCG is 3 stage and gritty as all get out with a long reset. I have not personally shot it yet to tell if it's over gassed - which is a common problem with the budget rifles.
Oh, and it's "Magazine" not "Clip". FWIW - 30 round magazines are standard capacity, not high capacity (I'm still bitter at the CO legislature).
Your ammo comparison does point out the differences in quality of the factory ammo that is on the market. That's why all my ammo is home brew, I know I am +/- 1% on overall consistency with every round that leaves my press, which is reflected downrange. It also proves that rifles will get particular (READ ~ picky eater) in a particular brand and bullet grain (My MK12 does not like my M193 all that much).
Both of mine do leave scratches on the bullet upon feeding, I have not compared left feed vs. right. I don't get any burs however. Once I get my MK12 dialed in with the MK262 ammo, then I may start looking at the feed ramps and consider polishing to minimize or eliminate any marring of the bullet upon feeding. Right now I am more concerned with the SureFire muzzle brake and the pitting on the forward port dragging on the bullet upon exit.
After 700 rounds.
Here is one of my 10 shots @ 100y targets. My first assembly, 16" middy, Aimpoint PRO, firing prone off the mag (another point that used to be a no-no, but with the modern rifles it's a go), support arm on the handguard, not bracing/monopoding the stock.
I knew as soon as I pulled the trigger on shots 4 and 7 (low left and right) that I shanked 'em (Thanks Pat MacNamera - I can call my shots now
) - they are not "flyers". The Aimpoint is a 2 MOA RDS - so my dot, covers the 2" square in that target @ 100. I'd hate to try to duplicate that with a 4 MOA RDS. Flying_gage - At the time that I wrote that, I had completed my first assembly and was mapping out my MK12.
Cost at that time was not an issue, so my components were going to be top 'o the line in quality, but minimal on the new and fancy wiz-bang crud.
I had looked at off the rack rifles, and the top quality brands (also referred to Tier 1 - a term I don't use) still had features or issues that I did not want, and customizing the rifle/carbine to my needs was an additional waste of money, and a growing collection of parts.
The point of that writeup was directed at the first timers to the evil black rifle. A simple cost/benefit analysis would be 2 fold (financial and emotional). 1 ~ getting a rifle that is of quality out of the gate, saving the buyer from either replacing the weak points on the lower quality rifles, or paying a gunsmith to do the repairs in the lack of quality control in the "cheaper" rifles. 2 ~ getting a rifle that is of quality out of the gate vs. the cheaper ones will leave the shooter with less frustration and distaste for the platform after experiencing the malfunctions and failures.
One could go out and buy a $600 rifle, a few magazines, a cheap Chinese RDS, and I'll wager within 250 rounds, they will start to see the effects of going cheap, and the frustration building. Rapidly diminishing accuracy, constantly re-zeroing, frequent jams.
A case in point, a buddy of mine who bought a Stag; The handguard was 3/32 shy of mating up to the receiver, who knows if the barrel nut was properly torqued, the receiver extension castle nut was not staked, and would have backed off, the gas key on the BGC was poorly staked and would have loosened up, unknown gas port size and buffer (time will tell on that one), the FCG is 3 stage and gritty as all get out with a long reset. I have not personally shot it yet to tell if it's over gassed - which is a common problem with the budget rifles.
Oh, and it's "Magazine" not "Clip". FWIW - 30 round magazines are standard capacity, not high capacity (I'm still bitter at the CO legislature).
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) in Evergreen, I remember the rodeos and the guns in the back of trucks as they drove through town. Looking back, the liberal element was already settling in there, yet the mountain thread was still intact! 
Recrown it, smooth it down, and it goes back to it's old habits... . Is it the last contact of the bullet, or is the disturbed gasses? An irregular mark on the crown outside the bore will have similar effects, though not as prominent. And 11* crown? Well, supposedly, that is the tested and proven (read: trial and error, here) degree that proves to be most accurate on smallbore and high power rifles..... I have no doubts you've noticed the even powder burn marks on the muzzle after a shooting session... . if one mark is uneven from others, and the rifle isn't shooting up to par, you have your indicator... . 
My limited experimenting was pretty much an excuse to shoot... . I don't need much. Now, an 11* crown is somewhat vulnerable unless recessed, or perfectly protected by a suppressor... . 
