Second time out since I put this gun together. 1st was only to 500 and no Chrono.
AR platform. 18" 1:8 twist
Shooting factory Hornady loads 123 grain Amax
20 rounds thru Chrono averaged 2547. High at 2560
9:00 am temp 76.8 F DA 1815 BP 29.66 Alt. 225 Wind at 12:00 3-5mph
10:00 am 83Degrees DA 2220. Wind 5 mph gust to 8 mph in the face.
300 yard calculated 1.5 mils Actual 1.7 mils
500 yard calculated 3.6 mils Actual 3.8 mils
600 yard calculated 4.9 mils Actual 5.3 mils
700 yard calculated 6.2 mils actual 6.5 mils
12:45 pm DA 2350 91 Degrees wind 5-8 Gust to 12
1000 yards calculated 10.2 mils Actual 11.5 mils
Not sure if the BC needs tweaking or if the speed by the Chrono may be off a little. Once I got the corrected elevation done, it was on. Holding 1 full mil wind at 1000 was dead nuts for me and a couple of others shooting .260.
In comparison, the 260's were about 8.3-8.7 mils to 1000 with 1 mil wind.
This little slow 123 grain bullet bucks the wind pretty well. Considerably slower by 200+ fps than the .260 shooting the 140 Amax. The speed shows with the 11.5 vs 8.5 mils to 1000 but boy was I happy with the way it shot. Not to mention the Hornady factory ammo I'm shooting. I built this rifle to tinker with and have no desire to load ammo for it. Loaded ammo is $16-$18 a box and with an 18" barrel AR, it's perfectly fine with me like it is.
Thanks to Jay at NTRP for the Range Officers Appreciation Range Day. It was a good opportunity to stretch this little rifle out.
SP
AR platform. 18" 1:8 twist
Shooting factory Hornady loads 123 grain Amax
20 rounds thru Chrono averaged 2547. High at 2560
9:00 am temp 76.8 F DA 1815 BP 29.66 Alt. 225 Wind at 12:00 3-5mph
10:00 am 83Degrees DA 2220. Wind 5 mph gust to 8 mph in the face.
300 yard calculated 1.5 mils Actual 1.7 mils
500 yard calculated 3.6 mils Actual 3.8 mils
600 yard calculated 4.9 mils Actual 5.3 mils
700 yard calculated 6.2 mils actual 6.5 mils
12:45 pm DA 2350 91 Degrees wind 5-8 Gust to 12
1000 yards calculated 10.2 mils Actual 11.5 mils
Not sure if the BC needs tweaking or if the speed by the Chrono may be off a little. Once I got the corrected elevation done, it was on. Holding 1 full mil wind at 1000 was dead nuts for me and a couple of others shooting .260.
In comparison, the 260's were about 8.3-8.7 mils to 1000 with 1 mil wind.
This little slow 123 grain bullet bucks the wind pretty well. Considerably slower by 200+ fps than the .260 shooting the 140 Amax. The speed shows with the 11.5 vs 8.5 mils to 1000 but boy was I happy with the way it shot. Not to mention the Hornady factory ammo I'm shooting. I built this rifle to tinker with and have no desire to load ammo for it. Loaded ammo is $16-$18 a box and with an 18" barrel AR, it's perfectly fine with me like it is.
Thanks to Jay at NTRP for the Range Officers Appreciation Range Day. It was a good opportunity to stretch this little rifle out.
SP