Mike,

I have smaller calibers in the Ackley and Saturn improved calibers, and they are improved! I have a Saturn 7X57 (45 degree) and an Ackley 7X57 (40 degree) and a couple of 257 Roberts in the Ackley. These gained 100 to 200 fps and they seem more accurate. I took a nice pronghorn with the 7X57 Ackley this fall at 330 yards. I tried and made a neck shot, so as to keep from ruining any prescious meat. I average getting a NV "goat" tag about every 12-14 years. At 57, I don't have many chances, and I'm not guiding "goat" hunts anymore.

I tried out improving a 30-06, but got no great improvement. My buddy years ago had a 270 Ackley. It gained about 100 fps.

It seems to boil down to a lot of trouble and expense for little return, except for the two small case 257 and 7mm.