Loaded up 300 PRC for first time

[ShaunBrady]

I think you're to the point that testing a box of factory ammo would be a good idea. I'd wear a good pair of safety glasses when I did that. Maybe a better idea would be to call the rifle manufacturer and have a talk with them about it. They may still require a test with factory ammo before they'll look at it, but maybe not. Presumably the rifle was test fired before it was shipped to you, but I wouldn't bet my body parts on it.

A box of factory ammo will get you different brass, powder and bullets.

If none of that works out and you're up for it, send me that case with the leaking primer for measurement. If you'd like, send 5 good cases and I'll neck turn them. PM me for an address.

[SandDiegoDuner]

Croue the blown primers are on Winchester primers. I had the same problem with their standard large rifle primers in some 30-06 rounds I loaded up for my 1903a3. I see evidence of at least 4 pits in your bolt face due to these primers. I would contact them and let them know what is happening and see if your primers are part of a batch that needs to be recalled.

[HAVOC5150]

ADG 300 PRC brass on sale. I’m having a 338 edge+p built and thinking about having a 300 PRC barrel spun up too.

https://jaoutdoors.com/product/300-prc/

[croue]

[ShaunBrady]

Case capacity of fired cases.

Diameter at neck of loaded round as close to the transition to the shoulder as possible. Use a piece of Peterson brass that showed heavy overpressure to make a dummy round for this.

Check your case lengths as well.

Try loading a few once fired Hornady cases with a load that was just starting to show early pressure with the Peterson brass.

It's unlikely it's the primers.

[croue]

[croue]