by Tom Gaylord, The Godfather of Airguns™
Writing as B.B. Pelletier
This report covers:
• The dumbbell bullet
• Did those bullets make a difference?
• Longer bullets must spin faster!
• Shorter bullets need less spin to stabilize
• Less contact with rifling reduces friction
• Pyramyd Air Cup
Let’s look at big bore bullet design. I’ve written about this before, specifically in this report back in May 2007. And I told you about a big bore contest in which a smoothbore shooting special bullets out-shot many rifles. Let’s look at that first.
The dumbbell bullet
At the 1999 Damascus, Maryland, airgun show, we had a big bore shoot in which about 25 shooters competed. Among them was a father-son team of Bob and Mike Chilko, who each had a big bore gun they had made themselves. Bob shot a .398 underlever, and Mike had a front-pumper that had to be pumped 30 times for each shot. Both guns were smoothbores that shot strange-looking dumbbell-shaped slugs. The funny thing was that they outshot most of the other competitors for accuracy, which included hitting a 4-inch target at 40 yards. In 1999, that was a quite a feat for a big bore airgun — especially a smoothbore!