Big bore bullets: Part 2

by Tom Gaylord, The Godfather of Airguns™
Writing as B.B. Pelletier

Part 1

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
• Summary
• 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! read more


Big bore bullets: Part 1

by Tom Gaylord, The Godfather of Airguns™
Writing as B.B. Pelletier

This report covers:

• What’s a big bore airgun?
• Hydrostatic shock
• Back to airguns
• Why, then, the great debate?
• What’s ahead?

What’s a big bore airgun?
While there’s no official definition, those of us who talk about airguns call .177, .20, .22 and .25 calibers the smallbore airgun calibers. From that, you can deduce that anything larger than .25 caliber is a big bore. A few years ago, there was actually a heated debate over this threshold, when a rifle made by the late Jack Haley in .257 caliber competed in and won the last LASSO big bore competition held in Texas. I hope to show in this report why that debate was so heated. read more