MkII G Project (or, how accurate can I get this thing!?)

[shanejohnson2002]

That's what I was thinking. If you hold 1.9 mils over the 50 yard target the cross hair should be on the 100 yard target. This mil stuff is new to me, so I'm picking up a bunch of info here.

I edited the original statement...I was creating a new chart for a guy at my office and the 50y was at 1.9 mils on his...it should be ~2.2.

You're getting the idea though. It took me a while (and a really good instructor) to learn this stuff. Making these charts is helping me keep it sharp too...the math is all coming back pretty quickly.

Keep in mind too these charts are a best guess at the moment. They should be reasonably close, but they would be even closer if I could measure my MV with a chronograph. Keep in mind they are set up specifically for the Lapua Midas+ round; changing ammo will cause the chart to be off. Also a change in ambient temperature will cause the POI to shift...I calibrated the charts to my average local weather. Hotter days = higher MV and less air resistance, colder days = faster drop. Your best bet is to learn how to make these things and calibrate it to your setup / weather.

[justinp61]

I went to the JBM site and printed a couple charts for the CCI SV, they'll give me a place to start.

[shanejohnson2002]

Awesome! If you need any help, PM me and I'll do my best.

[shanejohnson2002]

Found some errors in my calculations...going to fix some of these charts.

1) The Drop Test target was WAY off. I must have divided by the wrong number or something. It's been revised and is reposted. EDIT: Re-checked the numbers....I'm an idiot. It'll work just fine.

2) Probably related to the above, but my click values for the 100 and 150 yard zeros are way off as well. Reposting that too. EDIT: Rechecked this too...but it was still wrong. Corrected version posted.

[justinp61]

Awesome! If you need any help, PM me and I'll do my best.

Thanks.

[shanejohnson2002]

UPDATE:

Range visit went well. I took my "slightly" modified FV, and the new G out. The G performed very well, consistently grouping right at or a hair over 1 MOA, which is pretty much what I expect from a pencil-barreled .22. Unfortunately, so did the FV, and it's normally a .3-.5 MOA shooter. I'll tear it down and work on it some more.

Can the G be improved upon? I think so. A bedding job, a lapping job, and dampening the barrel with either o-rings or heat shrink should bring the groups down into the .7ish range, I'd expect. As-is though, I think I have a winning formula with this rifle.

The scope isn't the clearest, but it was dead-on and repeatable. I clicked back and forth several times between my 3 zeros, and it was on the money every time. I shot everything at 12x, which is where the mils are calibrated.


...which is more than I can say for my SWFA scope. The elevation turret stopped working, so I'm going to take that apart to and try to figure out what the deal is.


The charts were on the money too. The only change is the 150y zero...it seemed to be closer when I used 67 clicks instead of 68. Using the chart, the 200 yard steel diamond was fairly boring...if I missed it, it was definitely me and not the rifle. Needless to say, I was pretty happy that I was consistently hitting a 2.75x7.5" target at 200 yards with a pencil barrel.

Speaking of, the new steel targets worked like a charm. Loud, and they flop backwards when you hit them, so there's definitely visual and audible feedback.

Now, here's the pics! First up, the G:
http://i33.photobucket.com/albums/d70/shanejohnson2002/IMG_20131101_125340_466_zps0bec8c60.jpg (http://i33.photobucket.com/user/shanejohnson2002/media/IMG_20131101_125340_466_zps0bec8c60.jpg)

http://i33.photobucket.com/albums/d70/shanejohnson2002/IMG_20131101_125400_572_zps4718a869.jpg (http://i33.photobucket.com/user/shanejohnson2002/media/IMG_20131101_125400_572_zps4718a869.jpg)

http://i33.photobucket.com/albums/d70/shanejohnson2002/IMG_20131101_125417_848_zps1e87df9d.jpg (http://i33.photobucket.com/user/shanejohnson2002/media/IMG_20131101_125417_848_zps1e87df9d.jpg)


Sigting-in target, to verify 50y zero:
http://i33.photobucket.com/albums/d70/shanejohnson2002/IMG_20131101_120347_079_zpsf017aa73.jpg (http://i33.photobucket.com/user/shanejohnson2002/media/IMG_20131101_120347_079_zpsf017aa73.jpg)

The drop test target....pretty dead-on, I'd say:
http://i33.photobucket.com/albums/d70/shanejohnson2002/IMG_20131101_120342_269_zpsa6dda0dc.jpg (http://i33.photobucket.com/user/shanejohnson2002/media/IMG_20131101_120342_269_zpsa6dda0dc.jpg)


And here's some pics of the FV:
http://i33.photobucket.com/albums/d70/shanejohnson2002/IMG_20131101_125453_107_zps160f8627.jpg (http://i33.photobucket.com/user/shanejohnson2002/media/IMG_20131101_125453_107_zps160f8627.jpg)

http://i33.photobucket.com/albums/d70/shanejohnson2002/IMG_20131101_125502_341_zps2e37211e.jpg (http://i33.photobucket.com/user/shanejohnson2002/media/IMG_20131101_125502_341_zps2e37211e.jpg)

http://i33.photobucket.com/albums/d70/shanejohnson2002/IMG_20131101_125444_986_zps5c044a3e.jpg (http://i33.photobucket.com/user/shanejohnson2002/media/IMG_20131101_125444_986_zps5c044a3e.jpg)

http://i33.photobucket.com/albums/d70/shanejohnson2002/IMG_20131101_125444_986_zps5c044a3e.jpg (http://i33.photobucket.com/user/shanejohnson2002/media/IMG_20131101_125444_986_zps5c044a3e.jpg)

And the rather disappointing targets:
http://i33.photobucket.com/albums/d70/shanejohnson2002/IMG_20131101_125649_039_zpsccc5a0cf.jpg (http://i33.photobucket.com/user/shanejohnson2002/media/IMG_20131101_125649_039_zpsccc5a0cf.jpg)

Best 2 groups:
http://i33.photobucket.com/albums/d70/shanejohnson2002/IMG_20131101_125655_357_zps66514ec1.jpg (http://i33.photobucket.com/user/shanejohnson2002/media/IMG_20131101_125655_357_zps66514ec1.jpg)

http://i33.photobucket.com/albums/d70/shanejohnson2002/IMG_20131101_125659_767_zps63179db9.jpg (http://i33.photobucket.com/user/shanejohnson2002/media/IMG_20131101_125659_767_zps63179db9.jpg)

[shanejohnson2002]

And the new steel targets:
http://i33.photobucket.com/albums/d70/shanejohnson2002/IMG_20131101_125527_952_zpsd06ee72f.jpg (http://s33.photobucket.com/user/shanejohnson2002/media/IMG_20131101_125527_952_zpsd06ee72f.jpg.html)

[russ10x]

Shane
Don't take down the gun. Let it settle in a bit. I bet this is heat/humidity issues. The groups you are shooting seem fine. Also, you shot the groups after shooting the first rifle. Your eyes will start to play with you. ( am I correct? the shooting order?) Try it the other way. Also, what time did you shoot the G, and then the FV? I don't believe it is the gun. Lastly if you can, get of the bench and go prone. Use a rear rest.

[russ10x]

Your bipod is on the high side...like I said, shorten the bipod, get prone.

[shanejohnson2002]

You can't really see it in those pics, but I do use a rear rest....or a rear squeeze bag rather. I guess I can try to lower the bipod...I'll be back out again next Wednesday or Thursday and I'll take them both with me again.