7prc Neck Tension ADG Brass

[bowrunner81]

Hello All,

I have a 7prc that currently shoots Federal 175gr Eldx ammo very well. All of my handloads have shot good with it, but I like tinkering and want to find something great. I reloaded some of the factory Federal cases but start getting loose primer pockets after just a couple firings. So, I bought some ADG brass and started to reload those. I have noticed the bullets seat in the ADG brass very easily compared to the Federal brass. I am not a super skilled reloader and have only been into the basics really thus far.

How do I know which is the proper neck tension around the bullet? I have gotten fairly high SDs and ES but the groupings are good. Do you think the neck tension could be the issue with that? The dies I am using are the Hornady custom die sets. Any info is appreciated.

Thanks,

Joey

 

[wapitibob]

You'll have to test it to see. I'm at .004 others are at .001.

 

[bowrunner81]

Most of mine are at .002. So maybe that’s not an issue. Outside diameters are .313-.311 = .002”

 

[SloppyJ]

Most of mine are at .002. So maybe that’s not an issue. Outside diameters are .313-.311 = .002”

That's typically a pretty safe zone to be in. Have you ran powder charge tests to see how your numbers changed?

 

[bowrunner81]

Yes. Here is some data:
H1000, CCI mag primer, 175gr eldx, 7prc ALG brass, 5 shots fired at each grain weight

Really, I dont think this is bad at all. But the factory Federal shot better in all areas. The best shot group was 66.9gr, but all I think were under an inch.

65.8gr - 2797.8 avg vel, std 14.2, spread 40.0
66.2gr - 2816.3 avg vel, std 10.5, spread 34.5
66.6gr - 2826.4 avg vel, std 13.6, spread 38.4
66.9gr - 2854.7 avg vel, std 15.1, spread 38.4
70.2gr - 2837.1 avg vel, std 20.1, spread 56.0