Large rifle vs. Large rifle magnum primers

[Bodaciousfunk]

I just read a story about a fella explaining it. I’m sure he explained it better than I’ll remember how to explain it but.
People claim that the 215’s are “hotter” that the 210’s. Which isn’t the see, they’re virtually charged the same the difference is the magnums have some sort of metal perpellant added to the charge, ie aluminum. It’s claimed that the metal fragments travel further into the case igniting more of the powder more rapidly resulting in more of a pressure spike. Yawda yawda.

 

[Ganderite]

I tested the CCI 200 vs CCI 250 Magnum primer in a Tikka 7mm Rem Mag

Tried 5 different powders (IMR 7977, IMR 4831, RL22, RL23, and H4831sc). Below is an average of the results

Cold Weather (-15c)
CCI 200 - avg speed 2761 fps, Standard deviation = 16 fps
CCI 250 - avg speed 2784 fps, SD = 26 fps

"Regular" weather (+13c)
CCI 200 - avg speed 2774 fps, SD = 11 fps
CCI 250 - avg speed 2771 fps, SD = 13 fps

Hot weather (+29c)
CCI 200 - 2834 fps, SD = 13 fps
CCI 250 - 2830 fps, SD = 10 fps

I shot groups in the average and hot weather tests

Avgerage of 20 groups (3 shot 100y)
CCI 200 = 1.04moa
CCI 250 = 1.12moa


Based on my testing I would say the CCI 200 can be used with no adverse effects in any temperature

Your test is all extruded powders, which tend to be easier to ignite than ball.

I have found that if I load with a light bullet, ball powder and a less than max powder charge, I get a click-bang and in real cold wx this becomes a click.

For a match, I would probably load whatever got the best accuracy. For hunting, where the shot HAS to fire, I would load a magnum primer.

 

[B]

Don't be lazy and just rework your loads.

 

[todbartell]

Your test is all extruded powders, which tend to be easier to ignite than ball.

I did use ball powder W760 in 6.5 Creed & W748 in 308 Win, with CCI 200 & CCI 250.

6.5 Creedmoor
W760 / 140gr HPBT

Cold Weather (-15c)
CCI 200 - 2528 fps, Standard Deviation 16
CCI 250 mag primer - 2540 fps, SD 19

Regular weather (13c)
CCI 200 - 2579 fps, SD 21
CCI 250 mag primer - 2530 fps, SD 23

Hot Weather (29c)
CCI 2500 - 2619 fps, SD 26
CCI 250 mag primer - 2593 fps, SD 27

308 Win
W748 / 180gr SP

Cold Weather (-15c)
CCI 200 - 2426 fps, Standard Deviation 21
CCI 250 mag primer - 2411 fps, SD 20

Regular weather (13c)
CCI 200 - 2424 fps, SD 10
CCI 250 mag primer - 2439 fps, SD 33

Hot Weather (29c)
CCI 2500 - 2477 fps, SD 12
CCI 250 mag primer - 2486 fps, SD 12

 

[Hitzy]

I miss LeBarons...

 

[shoota]

So I was down seeing if Le Barons had any stuff left for reloading. Just boxes of magnum primers for rifles. So I picked up 3000. Now I reload for 300 win mag so I'm pretty much set for life. However what about using them for other cartridges? I have a 30-30 and a 243, Im figuring 1 to 1-1/2 grains less to compensate for the magnum primer. Or will it really matter?
Ive seen some comparisons where the increase in fps is less than 50 sometimes nothing.
Any opinions or has anyone actually tried this out?

Funny my Lymans book says not to use magnum primers for .300 wind bag. I am reloading this cartridge now too, going to stick to just large rifle primers. Others experience might vary.