Non magnum primer with a 7 PRC

[mdruyle]

It's interesting that I was just looking over some Speer load data for 257 Roberts and whenever they used ball powder, AA2700, W760, H380 & 414, they specified CCI250 primers with charge weights of only 40-45g. I have some 100g bullets loaded with 2700 and standard LR primers(Rem9.5 and CCI200) and will see how they work. Should be fine.

I've read the same thing with using a mag primer with ball powders. It's always interesting to hear what results guys get. I tend to overthink reloading so I like to see what other fellas have experienced.

 

[171farm]

Anyone have any updates on what they have found between LR and LRM?

 

[victor3ranger]

Anyone have any updates on what they have found between LR and LRM?

The last bunch I loaded I used CCI34 and had a velocity spread of 6fps

 

[Brad Quarnberg]

The last bunch I loaded I used CCI34 and had a velocity spread of 6fps

I use LR primers in 7PRC with 70.2 grains StaBall HD and 168g LRX: shoots great and 2900fps.
I have tried mag pro, 4831, and 7828, all with LR primers.
I loaded both LRM and LR with the initial loads I tested to see differences in speed etc. with little appreciable differences. In at least one case, my SD and ES were better with the LR over the LRM primer.