7mm Mauser Improved


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Q: I’d like to get my Zastava Mauser 7×57 rechambered to the 7mm Ackley Improved. I believe this was one of PO Ackley’s favourite improved cartridges, along with the .257. Will it push a 140gn bullet at 3000fps from a 24” barrel? What are the best powders for it? Could you suggest a couple of good loads for bullets in the 130-160gn weight range?

– Bruce Davies

A: When loaded to maximum in a strong, front-locking action like your Serbian Mauser, the 7×57 Ackley can safely drive a 130gn bullet at 3120fps with 55gn of AR2209; a 140gn bullet to 3010fps with 54gn of AR2209; and 160gn bullet at 2817fps with 52gn AR2209. These loads were safe in a Turkish Mauser with 24” barrel, but work up from two grains below, just in case your rifle barrel has tighter dimensions.

The picture above shows six non-magnum 7mm cartridges: the 7mm/08, 7×57, 7mm Ackley Imp, .284 Win, .280 Rem, and .280 Ackley Imp.


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Nick Harvey

Nick Harvey is one of the world's most experienced and knowledgeable gun writers, a true legend of the business. He has been writing about firearms and hunting for more than 65 years, has published many books and uncounted articles, and has travelled the world to hunt and shoot. His reloading manuals are highly sought after, and his knowledge of the subject is unmatched. He has been Sporting Shooter's Gun Editor for longer than anyone can remember. Nick lives in rural NSW, Australia.

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