Large Rifle vs. Large Rifle Magnum Primers

[huntaholic]

Here's the skinny, I went through and loaded several rounds for my 7mm Magnum and .22-250 to shoot a ladder test. I've had these loads completed for a month or so and was planning on shooting them next weekend, but today at work we were talking about reloading and I popped off the load info of what I planned on shooting and it raised an eyebrow or two!

I've used CCI 250 Large Rifle Magnum primers, instead of the CCI 200 Large Rifle Primers. Is this a bad idea????

The Speer #13 &Hornady manual and shows the 7mm to be a 250 primer, that's not the questionable one....

The one I'm concerned with is the .22-250 because it shows a Large Rifle Primer on both powders instead of the Magnum Primer......

Here's the load ranges:

.22-250 (16 rounds)
Hornady V-Max 55 grain bullet
Hodgdons H4895 powder
powder charge from 32.5 to 35.5 grains

.22-250 (20 rounds)
Hornady V-Max 40 grain bullet
Hodgdons H4895 powder
powder charge from 33.2 to 37 grains

.22-250 (14 rounds)
Hornady V-Max 55 grain bullet
IMR-4350 powder
powder charge from 36 to 39.5 grains

7mm Remington Magnum (10 rounds)
Nosler Ballistic Tip 140 grain bullet
IMR-4350 powder
Powder charge from 60 to 64.5 grains

7mm Remington Magnum (20 rounds)
Hornady 139 SST grain bullet
IMR-4350 powder
Powder charge from 55.3 to 61 grains



Any input is readily accepted........and appreciated!!!!

 

[lamazza]

I use themn interchangebly. I know some guys who ONLY use Magnum primers.

 

[Sunray]

Magnum primers burn a bit hotter for a bit longer. They're made to light hard to ignite powers and for extreme cold weather shooting(some powders get hard to ignite in the cold). You don't need them for either of those powders. If your manual says to use them, do so, but they won't hurt anything if it doesn't. They tend to be a little more expensive too.
If you change primers after working up a load with any primer, you'll have to work up the load again and re-sight in.

 

[tkendrick]

If you change primers after working up a load with any primer, you'll have to work up the load again and re-sight in.

Quite right.

My experience is that changes in primers, even between brands of standard primers, will have as much an effect on overall accuracy as anything else you may do, with the exception of significant powder charge deviations (5% or more).

As far as safety issues, they're pretty much interchangeable.

 

[D R Greysun]

Use common since when using Magnum primers, reduce your load and sneak up to to a usable load. Don't just assume you can sub one primer for another, mag. or standard.

D R

 

[huntaholic]

Thanks for the responses everyone. I'll be sure to stop short of the larger grain amounts when I'm shooting to make sure everything is good and check my cases for any warning signs of over pressure or other issues.

 

[RustyFN]

I thought those who swap one primer for another might find this interesting. After I saw this I reduce and work back up when I change primers.
http://www.6mmbr.com/PrimerPix.html
Rusty