20 Yard Patterns

Howdy Bruce!

As a technoid-in-trainin’, I must sit at the feet of the twinkie king, and await your wisdom which profoundly lights the LED of my stopwatch, my calculator, and even moves the dial of my dial-calipers.

Here’s my current request for enlightenment: What are the typical pattern diameters at 20 yards or the various chokes: CYLINDER, SKEET (30″,right?), IC, MOD and FULL? And is there an easy way to calculate the diameter change at given yardage per drop or rise in choke constriction (i.e., 3″ in dia. per .002)? Have ya ever noticed that Lyman’s (4th ed.) ignores calculations of energy, weight, etc. for the “red-headed stepchild” of magnum pellets, the lonely #8-1/2? Wonder why that is.

Yore humble student…

Mike in Texas

Dear Mike,

At 20 yards here are the effective patterns in inches that the various chokes will deliver:

Cylinder bore 32″
Skeet 26″
Improved Cylinder 23″
Modified 21″
Improved Modified 18″
Full 16″

How do I know this, you ask? Well, it could be written in code on Twinkies wrappers or it could be out there in the open on page 22 of an old Black’s “Wing & Clay”. Take your pick. Black’s doesn’t mention where they got the numbers and I’m not going to ask. Some things are better taken on faith.

Best regards,

Bruce Buck
Shotgun Report’s Technoid
(Often in error, never in doubt.)

This entry was posted in Shotgun related and tagged . Bookmark the permalink.

Leave a Comment

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.