By: Tom

Tom — Sat, 27 Jun 2020 18:35:33 +0000

The stated purpose of the test was to see which primer produced the least amount of vertical dispersion. The Remington 7 1/2 was the clear winner. The fact that it was the fourth largest group may have to do with other factors such as the order in which the groups were shot. Mr. Phillips says no wind. Were there wind flags placed along the entire 500 yard path of the bullet (50-100 yard intervals)? A wild guess, based on the similarity of the group shapes, that the primer test groups may have been fired in the following order: Remington, Federal, B&S, CCI-450, CCI-400 and CCI-BR4. That would also imply that the aim point was not adjusted during each 4 shot group. Perhaps Mr. Phillips will respond and clear up these questions. With the exception of the B&S primers, I have used all of these primers in various cartridges. The CCI-400 gives impressive results in PPC’s and .223 variants. In dry, warm climes such as Southern Arizona however, you may find that in temperatures above 80° your favorite load may begin to crater or pierce. CCI-400’s were designed for low capacity cartridges such as the .22 Hornet.

By: Terry

Terry — Fri, 26 Jun 2020 10:30:36 +0000

Loads must be adjusted for each primer for a proper tune.

By: D-4297

D-4297 — Fri, 26 Jun 2020 00:08:40 +0000

Nice information , but the gentleman doing the test had a lacking of knowledge regarding the Rem 71/2BR primer . It has the highest brisance of any primer in comparison to those tested . And he could have dropped the powder load by .2 or .3 and gotten a much tighter group . In other words ; the 71/2 is a much hotter primer than what it was compared to . Equal powder loads don’t make for a equal primer test .

Comments on: Quest for Less Vertical — Six Primer Types Tested at 500 Yards

By: Tom

By: Terry

By: D-4297