280 Ackley
Question:
>> a friend of mine, just bought a 280 rem. and to his surprise it had been > rechambered for a 280 Ackley. Can anyone tell me about this round? > I’m so-o-o-o jealous! Perhaps the most efficient 7mm round there is, >an ideal powder capacity-to-bore ratio.
I believe this is true for heavy bullets, especially the 175 gr. >It is purported to have very >near the velocity of the 7mm Mag. with 20% less recoil.
My loads barely exceed my 7mm Mag’s with the same bullets over the same chrono. Recoil seems less, and should be with less powder. >Kenny Jarrett >who has built a slew of .280 Improved srifles ays the hotter you load >them (within safe limits!) the more accurate they tend to shoot, unlike >the bigger 7s.
This is certainly true with my rifle. My best groups (.4-.5 moa) are from overloads during pressure testing. My safe hunting loads shoot .7 moa. All this is just fine by me 
>And, the round does it with about 10 grains less than >the 7 Mag.
My 175 gr Nosler Partition load uses eleven less grains of powder (faster powder, IMR 4831 vs IMR 7828). >In a pinch, you can shoot standard .280 rounds in it and >will need to anyway to fireform brass.
I lose about two hundred feet per second firing identical factory loads in my 280 Imp from the velocity I get in my 280 Rem. 280 Imp barrel is 23.5" and the 280 Rem is 24". > I would start loads with the standard .280 listed MAXIMUMs and expect >to end up six or seven grains more powder when I arrived at a keeper >load.
My handloads for the 280 Imp ended up using about 3.5 grs more powder than my handloads for the 280 Rem for the same bullets. Six or seven over the max in the loading manuals would be about right. I got about 200 fps increase in velocity. But I have much experimenting to do yet. Tried some 150 gr Barnes X this week and had outstanding accuracy results with some loss of velocity. The test I tried with 160 gr Fail Safes was not accurate, although these same bullets have been very accurate in other 7mms. I will change the seating depth and powder. Nosler Partitions (both 160 and 175 gr) have been accurate from the get go. IMR 4831, H 4831, and RL 19 are favored powders. When I’ve found the best loads for each bullet, I’m going to have a 400 yard shoot-off to see which gets to be my hunting load this year. Meanwhile I have to draw some tags. 
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Response:
> a friend of mine, just bought a 280 rem. and to his surprise it had been > rechambered for a 280 Ackley. Can anyone tell me about this round?
I’m so-o-o-o jealous! Perhaps the most efficient 7mm round there is, an ideal powder capacity-to-bore ratio. It is purported to have very near the velocity of the 7mm Mag. with 20% less recoil. Kenny Jarrett who has built a slew of .280 Improved srifles ays the hotter you load them (within safe limits!) the more accurate they tend to shoot, unlike the bigger 7s. And, the round does it with about 10 grains less than the 7 Mag. In a pinch, you can shoot standard .280 rounds in it and will need to anyway to fireform brass. I would start loads with the standard .280 listed MAXIMUMs and expect to end up six or seven grains more powder when I arrived at a keeper load. I used to have an April ‘96 Precision Shooting article by Jarrett with some of his favorite recipes included sent to me by one of our kind netters but I have since forwarded it on to a friend of mine some months back who is a *slow* reader. {:o) — YrHmbl&ObdntSrvnt David J. McBride Houston, Texas "Involvement and commitment are much like ham and eggs: the chicken is involved – the pig is committed."
Response:
a friend of mine, just bought a 280 rem. and to his surprise it had been rechambered for a 280 Ackley. Can anyone tell me about this round? Tom Carpenter
