Author Topic: 209 primers Mild or Hot (Read 3218 times)

TC · « **on:** August 02, 2003, 04:13:02 AM »

What 209 primer is the most mild or weakest charge. What is the hottest?

Tom

Questor · « **Reply #1 on:** August 05, 2003, 02:30:25 AM »

I've never seen a comparison, just stern warnings to use only the exact primer called for in the data for a particular load.

Bob_K · « **Reply #2 on:** August 05, 2003, 02:54:00 AM »

Check the article on component swapping in the Feb 02 Skeet Shooting Review: http://www.mynssa.com/ssr/2002/02/ceretto.htm

The article provides information from Accurate Arms, Lyman, and Hodgdon primer tests.

Karman · « **Reply #3 on:** August 06, 2003, 02:57:28 PM »

There was an article in Shotgun Sports last year reguarding all the different 209 primers and the difference that they made with the same load which will giveyou som indication of how they effect pressure.

.45 COLT · « **Reply #4 on:** August 08, 2003, 02:09:43 AM »

Accurate Arms ranks the shotgun primers, in order of increasing strength, this way:

REM 209P..........Medium Strength
CCI 209..............Medium Strength
WIN 209.............Medium Strength
CHED 209..........Medium Strength
FIO 616..............Magnum
CCI 209M...........Magnum
FED 209A..........Magnum

Weaker primer, same powder / wad / shot combination, lower pressure, right? In a shotgun shell, its not quite that simple. Going over some Hodgdon data, I found it is usually that way but there are quite a few instances where a load with a primer of lesser strength actually produded a higher pressure than the identical load with a hotter primer. Alliants loading data shows the same thing. Those instances arent real common, but theyre there, and some of those loads were already near SAAMI max average pressure.. So, attempting to predict what effect a component substitution will have on pressure could be a mistake, especially when the combination doesnt react in what we would consider a normal way.

Shoot safe.

Questor · « **Reply #5 on:** August 11, 2003, 03:26:35 AM »

The important thing seems to be pressure. At least it is for me. I remember reading an article that showed various loads and some of the "hottest" primers for a given load had the lowest pressure, and the least hot primers had the highest pressures. For a different load, the results were opposite, so there is no predicting what effect on pressure a given primer will have.

ssmith_1187 · « **Reply #6 on:** August 12, 2003, 06:38:26 AM »

Questor,

In a shotgun, a "hot" primer can push the base of the wad forward enough to increase the volume of the powder pocket before the powder has had a chance to fully burn.

Good ole Robert Boyle told us "If the volume of a container is increased, the pressure decreases."

Granted the increased volume is small but with everything happening in a split second, factions count.

Steve