bea175,
If COW cases have formed well for you, that's fine. You're lucky. Over the years there've been a whole lot of posts on different boards about people not getting a well-formed case using fillers and wondering how come. There've also been posts about dirty residue with COW, but I didn't say it was hard to get clean..... I said I didn't want that crap in my barrel.
Ok. so you load some new cases with COW and fire less than 50rounds.....20? 30? 40? Doesn't matter. Now you've fired them once and have formed cases. Unless you just guess and pull some numbers from the air or a manual, you're gonna have to go shoot and find a working load for your particular gun. That means putting some more loads together and doing a sequence to find what's accurate. So now you've loaded and shot twice. Then you load up ammunition and go hunt.
Or......take that same new brass and do that same load sequence until you find accuracy. You're gonna have to shoot to find an accurate load anyway. Then put some more together and go hunting. That fireform load will be way faster than the std cartridge..... pretty near as fast and just as accurate as if you'd used those cases formed with COW. So, almost top AI performance and a perfectly formed case with one step. Now you've found what works and accuracy loads with formed brass will be the same only with a little more powder.
This isn't complicated and I just don't get the reasoning behind fillers. People think they've saved a step when they've haven't. They've spent time and components on a step and got nothing back except noise.
