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Post by pasttense on Aug 13, 2013 10:24:17 GMT -8
I have fifty loaded the gun cycles manually. I am off to the range. Thanks to all who have assisted to this point. 24" 1:9 barrel Nordic extra length rifle hand guard R guns upper and BCG Firebird billet lower Ace Skeleton stock great big old Tasco 6 to 24 just to see if it can.
Paul
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Post by GLSHOOTER on Aug 13, 2013 14:57:29 GMT -8
Have fun and post some pics.
Greg
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Post by pasttense on Aug 13, 2013 19:36:25 GMT -8
Camera is down at the moment I don't do cell phones and it is hard to choose between an Aim-point patrol optic and a camera. besides its a huge AR 1" longer than my 700ADL delux 22-250. but on to the range report. I tried 2 loads 27gr r15 and 26gr tac behind a sierra 1530 85 gr hp bt. shooting 5 and cleaning is not conducive to good 5 shot groups. I t does however show lots of promise. best 5 shot group was .620" not great but nothing to complain about would have been a .400 vertical string but the cold clean shot was a bit out of the group.
lots of groups where the last three went under 1 diameter center to center
Paul
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Post by GLSHOOTER on Aug 13, 2013 20:15:39 GMT -8
An excellent start.
Greg
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Post by pasttense on Aug 18, 2013 18:54:58 GMT -8
Done with another 4 12hour shifts, and back to toys. While manually cycling the gun with dummy cartridges; I noticed some time later cuts on the dummy rounds bullet. It appears that the bolt pushes the bullet into the barrel extension locking lugs. I would think this is due to the magazine holding the center of the bullet lower than the smaller diameter 5.56rnd. If so do you tweak the magazine feed lips or shorten them the extractor has been slightly radiused the plunger sat about 0.030" below the rim of the bolt so I did not shorten it. was this a mistake.or is the solution an ar47 lower. I have to watch the almost 3 year old grandson tomorrow so I wont be shooting until Tuesday.
Paul
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Post by Deleted on Aug 18, 2013 19:20:05 GMT -8
Done with another 4 12hour shifts, and back to toys. While manually cycling the gun with dummy cartridges; I noticed some time later cuts on the dummy rounds bullet. It appears that the bolt pushes the bullet into the barrel extension locking lugs. I would think this is due to the magazine holding the center of the bullet lower than the smaller diameter 5.56rnd. If so do you tweak the magazine feed lips or shorten them the extractor has been slightly radiused the plunger sat about 0.030" below the rim of the bolt so I did not shorten it. was this a mistake.or is the solution an ar47 lower. I have to watch the almost 3 year old grandson tomorrow so I wont be shooting until Tuesday. Paul All of the 220 Russian cased variants scratch or cut the bullet. It will not hurt a thing and it will not effect accuracy. I have used a die grinder and rounded the feed ramps. A piece of emery cloth would take care of the corners on the inside. I just don't feel it is worth the effort. But to each his own, I would rather make some brass to shoot. That's where the real fun starts. |
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Post by pasttense on Aug 19, 2013 10:08:52 GMT -8
So with once fired cases at hand I chose one with the mouth flattened slightly seated it in the chamber and fond I had a lot more set back from the lands than I thought. Measuring once fired cases against Hornady and AA cases both are much shorter at the shoulder as purchased. If the dimensions are the same in loaded ammo; I suspect that a 6.5 Grendel will shoot factory ammo regardless of bolt or chamber chosen(type I or type II). By the way does any one no why little boys are so stubborn about potty training.
Paul
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Post by GLSHOOTER on Aug 19, 2013 10:53:21 GMT -8
So with once fired cases at hand I chose one with the mouth flattened slightly seated it in the chamber and fond I had a lot more set back from the lands than I thought. Measuring once fired cases against Hornady and AA cases both are much shorter at the shoulder as purchased. If the dimensions are the same in loaded ammo; I suspect that a 6.5 Grendel will shoot factory ammo regardless of bolt or chamber chosen(type I or type II). By the way does any one no why little boys are so stubborn about potty training. Paul If you mean the factory shoulder height is shorter than fired you are rght. All of it is sized to fit any spec chamber from the factory.. The cases border on the lower minimum size. When you size you want about 0.004 clearance. Greg |
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Post by pasttense on Aug 20, 2013 8:42:16 GMT -8
I understand that. The AA brass I ordered is 0.010" shorter than the Hornady at the shoulder. My conclusion is that factory AA ammo will probably function in a type II chamber with a type I bolt which would shorter than spec. due to mismatched parts. However the .004" will be useful once through the new brass. No grandson today so once the 1/2" of rain we got last night fills the air on this bright cloudless day. It will make the range undesirable to all but me and I will finish break in and embark on a little load development. Last night I loaded enough 87gr Vmaxes and 95gr VLD's to keep me busy the rest of the day.
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Post by GLSHOOTER on Aug 20, 2013 9:28:26 GMT -8
I understand that. The AA brass I ordered is 0.010" shorter than the Hornady at the shoulder. My conclusion is that factory AA ammo will probably function in a type II chamber with a type I bolt which would shorter than spec. due to mismatched parts. However the .004" will be useful once through the new brass. No grandson today so once the 1/2" of rain we got last night fills the air on this bright cloudless day. It will make the range undesirable to all but me and I will finish break in and embark on a little load development. Last night I loaded enough 87gr Vmaxes and 95gr VLD's to keep me busy the rest of the day. Not to say it hasn't been done recently but the shoulders would have to be bumped. 0.010 off the chamber and 0.010 off the bolts means 0.020 TOTAL. Not good!! LOL I would hate to go to a match and HOPE it would work every shot. I have measured quite a bit of factory ammo and seen shoulder height move as much as 0.006 in a given box of twenty cartridges. Not good odds if I were going to do a 3 Gun deal. Rain?  What the heck is that?? Greg |
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Post by pasttense on Aug 20, 2013 21:00:05 GMT -8
The problem with clouds is they come and go. Yesterday afternoon at 1600hrs I left for Albuquerque not raining drove back to the house at 2130 road dry and dusty all the way to the house water still dripping from the roof 1/2" in the rain-gage. Usually humidity is in the single digits. now the weeds are to wet to mow we have mosquitoes the ravens sit on the fence posts and take frogs or toads out of the grass. Found a garter snake while pulling weeds. Normally if you don't keep the bread sealed it dries out, not this last month. Any way this afternoon at 1400 I got to the range 3 other trucks broken clouds not to hot 6 hours I left done with break in but nothing shot for record to much talk not enough shooting.
Paul
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Post by pasttense on Aug 26, 2013 21:29:54 GMT -8
Just to keep you all current I shot four groups today with three different bullets all over the same charge of R-15,87gr Vmaxes,85gr Gamekings, and 95 gr Berger VLDs. the sierras shot 1/2" for some reason I could always put the first to Vmaxes in the same hole, and then blow the group up to about 3/4" with #3, While looking through the 6X24 Tasco I thanked my lucky stars that it did not like the Berger's as they cost a lot and would only shoot about 7/8". So far the only finessing these loads received was setting them to 0.010" of jump. To be fair the VLD bullets are usually quite finicky about amount of jump; but for now either of the others will do.
Paul
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Post by pasttense on Aug 27, 2013 16:09:45 GMT -8
So here is a picture on its mismatched receivers with the group closest to its 1/2" average.  some how it feels a lot bigger than it looks. Paul |
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Post by GLSHOOTER on Aug 27, 2013 16:50:26 GMT -8
That isa lightweight compared to most of mine but she sure does shoot!!
greg
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What the heck is that??