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  #46  
Old 06-19-2017, 10:17 AM
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I think, except for my first two that were first run barrels, mine improved over about 500 rounds then leveled off to a very satisfying accuracy.

I still think that dollar for dollar it is very hard to beat a Green Mountain barrel. Like any barrel maker some are better than others. After 4 of us had such horrible results with over $300 Shilen barrels it really drove home how good the GMHT barrel are. I am very glad to see your sporter barrel keeping up that tradition in SuperStock.
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  #47  
Old 06-21-2017, 10:38 PM
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Well I couldn't resist tinkering a little more with the pressure pad location. I started with a small JB Weld pad right in front of the V-block, and last trip added the pressure pad an inch behind the fore end tip. I couldn't leave well enough alone, and removed the fore end pad and added what I refer to as the V-Pad; located right where the pads are on Vincent's "twins". I had relieved the inletting a little too much when initially floating the barrel, so I needed 4 layers of tire tube patch rectangles to reach and apply some upward pressure to the barrel. The results were great. With 20 in-lbs of torque on the takedown screw. the barrel is contacting the bedding pad, as well as the V-pad with some, but not a lot, of upward pressure (judging by POI between fully floated and with the V-pad).

Weather was warm today, and as usual, a windy 9mph+, but very constant at least at first, which I can deal with (Inland it was 107, which tends to push air toward the bay/range due to the differential). It started shifting direction once it started heating up. Still, I was able to time my groups most of the time, so no complaints.

Here are some cherry picked groups using GECO Semi-Auto. I shot three sheets of bulls, averaging just under 1/2", just by eyeballing them and doing some mental math. My best group was 0.284". All of the shooting is at 50 yards:



Here's the same with SK+ (I only shot GECO and SK today), which also average about the same. My best group was 0.27":



With 600+ rounds through the barrel, it seems like it broken in now. Noticed that I need more discipline, since it was really clear as I shot the groups that when I took more time and concentrated harder on technique, the groups were always smaller, and if I got lazy, groups spread out. I also noticed that I need a much lighter cheek pressure on the stock when shooting with the rest, whereas when using my bipod, I use a really firm cheek weld. When a group spread out, I'd lighten up on the cheek weld and saw immediate results. Anyway, here's the last full sheet of bulls of the day; the wind was getting ridiculous at this point and almost everyone had already packed up. Still, the rifle did well when I timed the groups right:



I updated my project spreadsheet for the GM barrel swap, so now, minus sling and optics, the project cost for Super Duck is $333.20 all in (with shipping), so I'm pretty happy.

However, the Feddersen sporter barrel will be going into my new 80% project, which may come in at around the same cost, since I'm using some old parts I had in the garage (carbine stock, etc.), plus some new take-off parts. Simlar to Super Duck, the project will be mostly Ruger parts, except the receiver and barrel, but using the carbine stock with barrel band, a real sleeper (gonna be called "Sleeper Duck"). Wife and kids took a road trip vacation for a few days, so I'm hoping to get the receiver completed before they get back, and ready to test in a couple of weeks. This Super Stock bug is pretty fun stuff!!

Last edited by rawhp; 06-22-2017 at 01:18 PM.
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  #48  
Old 06-22-2017, 10:42 AM
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It seems you are having good fun. It is weird how many people have had good success with that same location for a pressure pad. As I have written many times i found it with a carbine stock and using cardboard from ammo boxes as a pressure pad.

Back in the old days shooting my centerfire stuff (Middle to late 1970's) I used to use actual playing cards for shims. Them I would use them as a dam to make a glassbed pad of the same thickness. Never failed me and that is roughly what I did on the "Twins" except for ammo boxes.

I can not see your pics by the way
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  #49  
Old 03-02-2019, 12:29 PM
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Quote:
Originally Posted by Vincent View Post
You now have an extra barrel. By SuperStock logic that means you NEED to build another rifle....right?<img src="https://www.rimfirecentral.com/forums/images/smilies/eek.gif" border="0" alt="" title="EEK!" class="inlineimg" /><img src="https://www.rimfirecentral.com/forums/images/smilies/rolleyes.gif" border="0" alt="" title="Roll Eyes (Sarcastic)" class="inlineimg" /><img src="https://www.rimfirecentral.com/forums/images/smilies/biggrin.gif" border="0" alt="" title="Big Grin" class="inlineimg" /><img src="https://www.rimfirecentral.com/forums/images/smilies/sthumb.gif" border="0" alt="" title="Blue Thumb" class="inlineimg" />




Geeze..... And here I have this stainless factory 22" iron sights barrel just sitting here ? &#x1f644;&#x1f644;&#x1f644;
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