Moving backers are still used at all registered tournaments. For the big events, such as the Nationals, a second backer is used. It’s fixed and is used to determine cross-fires.
What’s interesting about Stinnett’s group is that his sighter target (the bottom one) has a location different than his record group. It looks like he fired 3 or 4 sighters, liked what he saw, and went right to the record target and machine-gunned 5 shots before conditions could change.
Luck plays a big part in shooting small groups. But, you’ll notice that some shooters seem to have more luck than others. ;-) But, you’ll also notice that some of the biggest names in Benchrest have never shot a world record.
World records and other one-group targets involve not only good shooting, but a big portion of luck. Anyone who has had one (record) will attest to that. I had one 600 yard record that lasted only a couple of months and I’ll be the first to admit that it was 10% skill and 90% luck. The small group that I showed in my earlier post was shot at Midland Texas. The wind was blowing the oil rigs over at the time. It was 99.9% luck.
The Houston Warehouse is a legend among Benchrest shooters. The story is that one-hole groups were very common, and they get smaller as the years go by. But, that was a long time ago and I’m not sure that any of the guys are still alive to tell the whole story.