280AI 175ABLR

[nvbroncrider]

Well I got my FedEx package this morning and went to work I prepped my brass yesterday in anticipation of them arriving. Loaded some up behind 57 58 59gr of 7828 SSC. Tested length and the lands was at 3.535" so I loaded everything at 3.490" or .045" off the lands. This was the same measurement that I'm set on the 160's that shoot so well. So I started shooting 57 2 in 1 out 58 same. 59 was outstanding and I felt really good about it. So I shot 2 more groups and was disappointed with it but I might have been too excited too shoot another really great group. Average velocity on the last 8 was 2860. I can't complain at all. I think I might to get a touch more outta it if I go to a slower powder like RL-25 or Retumbo.

The loaded rounds are 3 of 175's with 2 factory 280AI 150's between them. The other is a 175 seated next to one out of the case.

 

[Teknys]

Certainly has potential at 59gns. I can understand the "human factor" in the group.

 

[SJB358]

That's incredible. What a load Jake. That load will reach far and hit hard!

 

[JD338]

Jake,

Thats a darn good elk load. The high BC will make it a long range hard hitter.
Way to go buddy.

JD338

 

[FOTIS]

No doubt man!

 

[nvbroncrider]

Does anyone have a chart to run a ballistic profile for that bullet? I don't have one to cover a .672 BC and I'd like to see how it compares to my 160 load. Got some more loaded up hopefully that wasn't a fluke.

 

[FOTIS]

I am confused as to what you're asking. You mean a ballistic program?


http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi

 

[SJB358]

I am confused as to what you're asking. You mean a ballistic program?


http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi

You could even punch your number's into the Hornady Ballistics Calculator to give you an idea..

That is some terrific energy that bullet retains downrange.

 

[sask boy]

Those ABLRs seem to be just what the Doctor ordered in the 284 calibre :wink:.
I can't wait until I get my hands on my 280AI 8).

Blessings,
Dan

 

[nvbroncrider]

Thanks guys here's a look if the numbers are all true.


Calculated Table
Range Drop Drop Windage Windage Velocity Mach Energy Time Lead Lead
(yd) (in) (MOA) (in) (MOA) (ft/s) (none) (ft•lbs) (s) (in) (MOA)
0 -1.5 *** 0.0 *** 2862.0 2.534 3182.3 0.000 0.0 ***
50 -0.2 -0.4 0.0 0.0 2802.8 2.482 3051.9 0.053 0.0 0.0
100 -0.0 -0.0 0.0 0.0 2744.3 2.430 2926.0 0.107 0.0 0.0
150 -1.0 -0.6 0.0 0.0 2686.6 2.379 2804.2 0.162 0.0 0.0
200 -3.1 -1.5 0.0 0.0 2629.7 2.329 2686.6 0.219 0.0 0.0
250 -6.5 -2.5 0.0 0.0 2573.4 2.279 2572.9 0.276 0.0 0.0
300 -11.3 -3.6 0.0 0.0 2517.9 2.230 2463.0 0.335 0.0 0.0
350 -17.4 -4.7 0.0 0.0 2463.0 2.181 2356.9 0.396 0.0 0.0
400 -24.9 -5.9 0.0 0.0 2408.8 2.133 2254.3 0.457 0.0 0.0
450 -33.9 -7.2 0.0 0.0 2355.3 2.086 2155.3 0.520 0.0 0.0
500 -44.5 -8.5 0.0 0.0 2302.5 2.039 2059.6 0.585 0.0 0.0
550 -56.8 -9.9 0.0 0.0 2250.3 1.993 1967.3 0.650 0.0 0.0
600 -70.7 -11.3 0.0 0.0 2198.7 1.947 1878.2 0.718 0.0 0.0
650 -86.5 -12.7 0.0 0.0 2147.8 1.902 1792.3 0.787 0.0 0.0
700 -104.1 -14.2 0.0 0.0 2097.6 1.857 1709.5 0.858 0.0 0.0
750 -123.7 -15.7 0.0 0.0 2048.1 1.814 1629.7 0.930 0.0 0.0
800 -145.4 -17.4 0.0 0.0 1999.3 1.770 1553.0 1.004 0.0 0.0
850 -169.2 -19.0 0.0 0.0 1951.2 1.728 1479.1 1.080 0.0 0.0
900 -195.4 -20.7 0.0 0.0 1903.8 1.686 1408.2 1.158 0.0 0.0
950 -223.9 -22.5 0.0 0.0 1857.2 1.645 1340.1 1.238 0.0 0.0
1000 -254.9 -24.3 0.0 0.0 1811.4 1.604 1274.8 1.319 0.0 0.0
1050 -288.6 -26.3 0.0 0.0 1766.4 1.564 1212.3 1.403 0.0 0.0
1100 -325.1 -28.2 0.0 0.0 1722.3 1.525 1152.4 1.489 0.0 0.0
1150 -364.5 -30.3 0.0 0.0 1679.0 1.487 1095.3 1.578 0.0 0.0
1200 -407.1 -32.4 0.0 0.0 1636.7 1.449 1040.7 1.668 0.0 0.0
1250 -452.8 -34.6 0.0 0.0 1595.3 1.413 988.7 1.761 0.0 0.0
1300 -502.0 -36.9 0.0 0.0 1554.9 1.377 939.3 1.856 0.0 0.0
1350 -554.7 -39.2 0.0 0.0 1515.5 1.342 892.3 1.954 0.0 0.0
1400 -611.3 -41.7 0.0 0.0 1477.3 1.308 847.9 2.054 0.0 0.0
1450 -671.8 -44.2 0.0 0.0 1440.1 1.275 805.8 2.157 0.0 0.0
1500 -736.5 -46.9 0.0 0.0 1404.2 1.243 766.1 2.263 0.0 0.0
1550 -805.7 -49.6 0.0 0.0 1369.6 1.213 728.7 2.371 0.0 0.0
1600 -879.5 -52.5 0.0 0.0 1336.2 1.183 693.7 2.482 0.0 0.0
1650 -958.1 -55.4 0.0 0.0 1304.2 1.155 660.9 2.596 0.0 0.0
1700 -1041.9 -58.5 0.0 0.0 1273.7 1.128 630.2 2.712 0.0 0.0
1750 -1131.0 -61.7 0.0 0.0 1244.6 1.102 601.8 2.832 0.0 0.0

 

[Woodycreek]

Jake,

That 59gr group is awesome! What twist does your barrel have? I plan trying some 175 ABLRs in the 7mm LRM when it's finished.

 

[nvbroncrider]

1-9" but as of now it still shoots the 160's better.

 

[SJB358]

That's pretty impressive. 1500ftlbs out to 800 yards.. Yeah, that'll do.. Man, what a hammer it'd be and I can't wait to hear of some more animals being taken with it. I bet they'll come out very nicely.

 

[nvbroncrider]

I just wonder what would happen after 1000 yards after it drops below the 1800fps expansion threshold. At 1000 I got 1200fpe. At a mile still 600fpe and still supersonic so it's very impressive.

 

[Greg Nolan]

Wow :shock: That should make a outstanding long range hunter or target set up. I think I'll try some of those in my regular 280.

 

[nvbroncrider]

Shot them again the other day and found a couple things. I think my group was a fluke. Found a front action screw slightly loose and the barrel touching the stock so I will have to shoot again to see where I'm at. As I shortened them they got more consistent but the rifle was clearly throwing shots. When 3 are within an inch and the 4th is thrown 3 or 4 inches. Oh well I guess I'm glad I found the issue now and not later.

 

[SJB358]

That's odd Jake. Not sure what to make of it. Is this rifle fully bedded?

 

[nvbroncrider]

No it's not barrel is floated has oversized recoil lug in one of those Hart Accublock stocks. It is a tight fit. I imagine it just finally settled. There were two marks on the bottom of the barrel where the stock was rubbing. When I checked my sights before I took it hunting it did shoot a little higher than I recall it being sighted in for. But when it throws a shot 3 inches out you start to wonder and that's what I found.

 

[SJB358]

Sounds like it might be binding or just rubbing enough to cause it to throw shots once it is heated up some.

 

[longrangehunter]

Does anyone have a chart to run a ballistic profile for that bullet? I don't have one to cover a .672 BC and I'd like to see how it compares to my 160 load. Got some more loaded up hopefully that wasn't a fluke.

Down load the "Shooter" App for your smart phone. I use it all the time, works very well, has everything you need to make first round hits and is easy to deploy in the field.

I should mention first round hits at long range if you use a tactical scope with a mil dot reticle and/or turrets or something with a ranging reticle.