CCI Primers

[spires5d]

Well don't call me stupid or unsafe,but I have a question about some primers. I have 200 CCI large Rifle Primers BR-2,Which means they are Bench Rest Primers and what I want to know is Can I load the following in a 7mmRem.Mag. 51 grains of IMR 4064 powder at 2873FPS> or 59 grains of IMR 4350 poiwder at 3028FPS which both of these loads will be using Nosler 150grain BT which are seconds? I mainly want to know if I can load a 7Mag using these primers safely.
Have a good day.

 

[DrMike]

You can load them safely. The powder column will even be sufficiently short that brisance should ensure complete ignition. The reason you use magnum primers is that you need to ensure ignition along the entire powder column. The old rule of thumb is that with any charge over sixty grains you should consider a magnum primer to ensure complete ignition. It is not unsafe, however, to use a large rifle primer in a magnum cartridge.

 

[spires5d]

Thanks Dr.Mike,this is exactly what I was looking for. I will keep your rule of thumb in mind.
Have a good day!

 

[remingtonman_25_06]

You'll be fine in a 7 mag...

I even used them in my 300 RUM and they worked great untill it got below about 20 was all. Then o experienced bit of hangfire issue every now and again. But that's burning 1/3 more powder then what you are so I wouldn't even worry about it.

 

[Wincheringen]

I've had one hangfire with them, with a lighter charge in a smaller case. I'll use them up in my 22-250 before I put them in a larger case.

 

[SJB358]

I use them for the 45-70 and all the other non-magnum cases. Always worked well. I always use Mag primers in my magnums, but as Mike mentioned, I could probably get away just fine with BR2's or 200's for the WSM's and Rem Mag based rounds, but I am a little hard headed and stick to what works for me, so far.

 

[Oldtrader3]

Personally, I use Fed 215 primers for my 7mm Rem Mag. The reason is this primer use for any rifle that the rifle caliber is firstly, overbore and secondly, uses over 60 grains of really slow burning powder, needs a little more of a lighter boast (to fire and burn) than a standard round with medium burning rate powder.

The decision tree for this primer use is a little arbitrary but is based on the Powley Computer's bore to case capacity expansion ratio. If this ratio is over 7.0, I will use a magnum primer for this cartridge reloading. Most of this is already figured into loading tables in most reloading manuals and you can follow their lead on this, if you do not wish to get more technical.

I also will use a magnum primer in larger standard cases (e.g. .30-06 with heavy bullets) in very cold situations, like below zero F.