Ok, so I was at the range today to sight in a new scope and I ran in to something interesting that I would like a little education on.
Here is what we had going on.
Rifle: Sig556 16" 1:7 twist barrel
Ammo: Federal BP223BL 55g FMJ
Hornady TAP 75gr
Zero: 50 Yards
Ok, so I got my new scope zeroed in with the 55gr rounds and then I decided to try the TAP round to see where the POI(point of impact) would be since I hope to do some coyote hunting soon. I figured it would be different simply because its a different, heavier round.
I send the first one and I have no idea where it hit.
I adjusted lower just to see if I could get on paper and see where I'm hitting. Once I figured it out I ended up having to put my cross hairs about 4" low and 2" left to hit my target. Once I did this I was able to put four shots in about a half dollar sized group with good 'ol Kentucky windage.
My question is why?
I knew there would be a difference in the POI at a greater distance between the two, due to bullet weight and drop, but I wasn't expecting such a significant difference in POI in the two rounds at such a close range.
Also, why does the heavier round hit so much higher than the lighter round?
Here is what we had going on.
Rifle: Sig556 16" 1:7 twist barrel
Ammo: Federal BP223BL 55g FMJ
Hornady TAP 75gr
Zero: 50 Yards
Ok, so I got my new scope zeroed in with the 55gr rounds and then I decided to try the TAP round to see where the POI(point of impact) would be since I hope to do some coyote hunting soon. I figured it would be different simply because its a different, heavier round.
I send the first one and I have no idea where it hit.
I adjusted lower just to see if I could get on paper and see where I'm hitting. Once I figured it out I ended up having to put my cross hairs about 4" low and 2" left to hit my target. Once I did this I was able to put four shots in about a half dollar sized group with good 'ol Kentucky windage.
My question is why?
I knew there would be a difference in the POI at a greater distance between the two, due to bullet weight and drop, but I wasn't expecting such a significant difference in POI in the two rounds at such a close range.
Also, why does the heavier round hit so much higher than the lighter round?