Primer ??

[J-FRAME]

Elmer Keith said 250/240 bullet- Unique-medium loads-2400 heavy loads- heavy crimp- and STANDARD primers not magnum. In my experience he was right as magnum primers seem to always make the groups bigger etc. I have always called it blowing holes in your group for lack of better term. Seems like magnum primers are to HOT and the burn is not right ??Also you can only reduce 2400 loads so low (15.0 or so) before you get unburnt powder with a standard primer or a magnum primer. If you go up to 17.0 grs everything is fine and all the powder burns. So why do we need magnum primers and my guess is because there are many other kinds of powder out there and I do not know this first hand as I only use Unique/2400 and Federal 150 primer. So now I want to ignite 18.0 grs Enforcer behind a 300 gr XTP in a 4 inch gun and think I need a magnum primer for this load ?But my question is a CCI 350- hotter- than a 155 Federal magnum primer? The same or do I need to test both on paper. What do you think??

 

[iouri]

My Lyman manual says magnum primer for 357 and that' what I use. I did have unburnt powder at 12 gr, once bumped to 14.5 nothing left in the case. Burns completely in my 4" 686...

 

[ArchAngelCD]

My Lyman manual says magnum primer for 357 and that' what I use. I did have unburnt powder at 12 gr, once bumped to 14.5 nothing left in the case. Burns completely in my 4" 686...

Lyman and seemingly all the writers of manuals are getting lazy. They are using magnum primers in magnum named rounds and standard primers in none magnum rounds. Even when they use the same powders in both they use different powders. Why use a magnum primer with W231 in the .357 Magnum but a standard primer with W231 in the .38 Special? Years ago the manuals tld you when you needed a magnum primer or standard primer according to the powder being used, not the name on the round.

 

[ArchAngelCD]

Elmer Keith said 250/240 bullet- Unique-medium loads-2400 heavy loads- heavy crimp- and STANDARD primers not magnum. In my experience he was right as magnum primers seem to always make the groups bigger etc. I have always called it blowing holes in your group for lack of better term. Seems like magnum primers are to HOT and the burn is not right ??Also you can only reduce 2400 loads so low (15.0 or so) before you get unburnt powder with a standard primer or a magnum primer. If you go up to 17.0 grs everything is fine and all the powder burns. So why do we need magnum primers and my guess is because there are many other kinds of powder out there and I do not know this first hand as I only use Unique/2400 and Federal 150 primer. So now I want to ignite 18.0 grs Enforcer behind a 300 gr XTP in a 4 inch gun and think I need a magnum primer for this load ?But my question is a CCI 350- hotter- than a 155 Federal magnum primer? The same or do I need to test both on paper. What do you think??

Magnum primers are only needed for hard to ignite Ball Powders like HS-6, HS-7, W296 & H110. That's why we have magnum primers.

As for Keith and 2400, actually, there were no magnum primers back when Keith was loading 2400 in the .357 and then 44 Magnum. In turn 2400 was formulated to reliably ignite with the primers of the day, standard primers. The same holds true with Unique. The reason 2400 burns better at higher charges is, like most slow powders they will burn cleaner and more complete at the upper pressure ranges. They just do...

 

[rockquarry]

More trouble, of course, but it's best to do a comparison check on paper targets and use a chronograph if possible. Sometimes there is a difference.

 

[358156hp]

Alliant, the manufacturer of both 2400 & Unique recommend AGAINST using magnum primers with these powders. The hotter primers can cause pressure spikes. This meshes neatly with the information provided in the original post.

 

[DWalt]

Many reloading manuals recommend magnum primers when slow burning propellants such as 4831, 4350, 5010, N205, etc. are used in both magnum and non-magnum rifle cases.

 

[forestswin]

magnum primers

there's a M-60 Main Battle Tank for sale in the classifieds here.

Does that take magnum primers??

 

[ArchAngelCD]

Many reloading manuals recommend magnum primers when slow burning propellants such as 4831, 4350, 5010, N205, etc. are used in both magnum and non-magnum rifle cases.

In actuality it's not that those powders need a magnum primer, it's the amount of powder you're using that needs a magnum primer. Usually when you are using a very slow powder like 5010 it's being used in a case that requires a charge of 70gr or more. It's best to use a magnum primer with almost any rifle powder that you charge with 70gr or more. (which is usually a slower powder rather than a fast rifle powder)

 

[newlywed5702]

If he sticks with a standard primer does the mfg make a difference with the same charge.

 

[newlywed5702]

Are CCI-200, Rem 9 1/2 and WSR interchangeable? I'm shooting a Weatherby .243 with a 20" barrel and will use both 55gr and 95gr Nosler Ballistic-Tips.