What was the first 7mm Magnum?

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.275 Holland & Holland
.275 Holland & Holland

Q: Could you please settle an argument for us. One of my mates claims that the .275 Holland & Holland was the first 7mm Magnum, and another says it was the .280 Jeffery, but I am sure it was the 7x64mm Brenneke. Who is right?
Arthur Reynolds

7x64 Brenneke
7x64 Brenneke
.280 Jeffery
.280 Jeffery

A: Sorry lads, but you are all wrong! The .275 H&H dates back to 1912; the .280 Jeffery came along in 1915, and the 7x64 Brenneke in 1917. But the first 7mm Magnum was the .280 Ross circa 1907. It was originally called the .280 Ross-Eley, but in 1912 became the .280 Ross. The long, tapered case delivered a

280 Ross (L) alongside .303British
280 Ross (L) alongside .303British

velocity of 3047fps with a 140gn bullet. But the bullet diameter was .288 rather than the 7x57's, .284 diameter which is the modern standard.

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