2 years ago 2 years ago

7mm Mauser Improved

by Nick Harvey 2 years ago2 years ago

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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Posted by Nick Harvey

The late Nick Harvey (1931-2024) was one of the world's most experienced and knowledgeable gun writers, a true legend of the business. He wrote about firearms and hunting for about 70 years, published many books and uncounted articles, and travelled the world to hunt and shoot. His reloading manuals are highly sought after, and his knowledge of the subject was unmatched. He was Sporting Shooter's Technical Editor for almost 50 years. His work lives on here as part of his legacy to us all.