Non magnum primer with a 7 PRC

mdruyle · Jan 1, 2024

Philward said:
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 · Jun 1, 2024

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

victor3ranger · Jun 1, 2024

171farm said:
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 · Oct 31, 2024

victor3ranger said:
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.

Non magnum primer with a 7 PRC

mdruyle

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171farm

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victor3ranger

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Brad Quarnberg

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