Celebrating their 100th trip around the sun this year are two classic cartridges: the .270 Winchester and the .300 Holland & Holland Magnum. One is an undeniable success story that remains a highly popular choice among big game hunters, and the other has a provenance that cannot be denied, even if other cartridges have pushed it out of the limelight.
gundigest.com
Professor Jack O’Connor embraced the fledgling .270 Winchester cartridge, taking in from the deserts of Arizona and Mexico to the wilds of Canada, and most places in between. His writings in Outdoor Life—in an era where the opinion of a gun writer carried more weight than it seems to today—propelled Winchester’s cartridge into the annals of history, and O’Connor seemed to guarantee the future success of the cartridge.
If you're in the Lewiston, Idaho area a visit to the Jack O’Connor Hunting Heritage & Education Center may be worth your while.

.270 Winchester And .300 H&H Magnum Turn 100
Singing the praises of .300 H&H Magnum and .270 Winchester, two of my favorite cartridges that just turned 100 years old!

Professor Jack O’Connor embraced the fledgling .270 Winchester cartridge, taking in from the deserts of Arizona and Mexico to the wilds of Canada, and most places in between. His writings in Outdoor Life—in an era where the opinion of a gun writer carried more weight than it seems to today—propelled Winchester’s cartridge into the annals of history, and O’Connor seemed to guarantee the future success of the cartridge.
If you're in the Lewiston, Idaho area a visit to the Jack O’Connor Hunting Heritage & Education Center may be worth your while.