Sunday, April 3, 2011

4/2/2011 Bench Rest Shooting - Resetting the Zero

They say that a picture paints a thousand words.  Certainly that old adage applies here.  I got lucky enough to be there right in time for the sunrise. What a beautiful morning, and a picturesque time to go shooting.  This is a bench rest that is over by the rock/garbage pit behind our house.  I found this little bench rest last year while riding my dirt bike, but this is the first time that I have come over here to shoot.  It is a good place to shoot 100 yards, something that I haven't done much of in the last couple of years. That bag you see under the rifle is one of the many that Dad sewed together and filled with silica sand.  They work pretty well to give you a good, solid base.  In case you don't recognize the gun, this is the Savage 10FP, chambers in .308 Win. The scope is the basic Vortex Viper 6.5-20x44. The ammo used is the Black Hills Match in 175 grains. My first group was a total of 6 shots.  This is the zero I have been using for over a year now, and as you can see, it's a bit off the mark.  I think it's telling because so many of my 1000 yard shots have initially landed high and left.  I guess this grouping supports those results.  Yes, even though you can really only see 4 holes, there are 6 shots there. Three of those shots when through the same hole!  I don't know why the overall spread is about 1.5 inches because all of my shots were very good.  It must be variations in the ammo (the most likely culprit), gun, or scope...I'm not really sure.  Seeing the trend, I adjusted the scope 4 clicks down and 1 click to the right.  Those are the 4 shots that are in the bulls-eye. As you can see, the gun is definitely capable of producing 1 MOA results, and sometimes it produces sub MOA shots.  Maybe if the ammo was better, it would do that all the time, and I wouldn't get those little "strays". I used a tape measure to confirm that the second grouping is under 1" across in total.