I've loaded for several, one begin my own - years ago, before I dropped the ctg. I had difficulty with 24" bls. of getting much over 3,000fps with 160gr. bullets, with safe loads. A 26" bl. might do another 50fps, which has no tangible value.

If I had another 7mm larger than a 7x57, it would probably be a .280 AckImp. which about duplicates the 7mm Rem Mag and does so with a rimless case, which I prefer.

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this is exactely what I have done--used the 280 Ackley Improved last season on Big Horn sheep, mule deer and elk..had good results in all ..and amazingly accurate to boot..

saw a few days ago, Kimber is actually chambering some of their rifles now in 280AI as well..

Ripp