Originally Posted by smokepole
Originally Posted by Riflehunter

What velocity would you be getting in your .280 AI with 150 and 160s if you have chronographed them?


I'm getting 3050 with 150 Ballistic Tips and Scenars, using R-26 and I-7828.

For 160's the most accurate powder in my 2 rifles is H4831sc so that's what I'm using, It's on the slow end of the spectrum but shot placement is more important than velocity, so that's what I'm using. I'm getting just over 2,900 with 160's in both rifles.

If you look at the Nosler data, keep in mind that they use 26" barrels.
I think that would be just right. Using H4831sc with the 140's in the .270, velocity is just over 3000 fps. Getting the same velocity with the 150's in an improved .280 would be a slight step up for the larger game without adding too much recoil when you use a light rifle. The 160's would also be very good at just over 2900 fps. Would you say there would be roughly a 25 fps loss from the 40 degree shoulder of the Ackley to the 30 degree RCBS (slightly less capacity)?