The Firing Line Forums - View Single Post - 30-06 vs .308 for mid to long range?

Bart B. · January 25, 2014, 05:11 PM

The size of a 20-shot group has about an 80% chance of representing where all shots will go. 30 shot ones are 90% or so what they'll all do. 5-shot ones, about 50%.

Check out the IBS and NBRSA benchrest sites then look at their records pages. Note the aggregate group records for at least 5 group agg's remembering some groups are much larger than the agg record states. Ranges 200 yards and greater use MOA values so they're easily comparable to those at 100 yards. Those agg averages are a lot bigger than 5-shot single group ones.

January 25, 2014, 05:11 PM	#29
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	The size of a 20-shot group has about an 80% chance of representing where all shots will go. 30 shot ones are 90% or so what they'll all do. 5-shot ones, about 50%. Check out the IBS and NBRSA benchrest sites then look at their records pages. Note the aggregate group records for at least 5 group agg's remembering some groups are much larger than the agg record states. Ranges 200 yards and greater use MOA values so they're easily comparable to those at 100 yards. Those agg averages are a lot bigger than 5-shot single group ones.