I’ve heard that Barnes has continually reduced the published loads over the past many years out of an abundance of caution. I’m wondering if anyone has the Barnes Bullets volume 1-2-3 load data for 150gr 7x57 so I can compare it to this current data from their site?
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@rookhawk,
Based on your recent posts, it seems like you're relatively new to hand loading. Assuming this is true, here is my advice to you. I'm not meaning to come across as talking down to you, please don't take it that way.
Don't fight the published data. Understand that this data is for broad purposes, it cannot be taken necessarily as gospel truth to your particular rifle. Having said that, I've never come across a scenario where a minimum load was not safe to shoot in any of my rifles. It's when going the other direction that you may find the data breaks down. The max load listed may be beyond what your rifle dictates is maximum load.
Now I know during these times where all components are hard to come by, you don't want to "waste" a lot of bullets homing in on a load. In spite of this, good load development practices should not be abandoned, you can find yourself if you do.
With a new rifle, I'm cautious and start low, loading up 2 bullets at a time and increment in 0.5gr increments. I pay very close attention to bolt lift after firing and also observe close the spent primers and look for extractor marks on the brass. If I start seeing cratered primers and/or extractor marks, or have sticky bolt lift, it's time to stop.
At the same time I'm watching the two shot groups. Those 2 shot groups will often tell me when I've hit a sweet spot accuracy wise, and this may be at a spot below maximum. It also may be at a spot at the max load listed. You just never know until you've put in the effort. You may in fact be able to go above the max listed and get better accuracy and also not have pressure signs. Only your rifle can tell you that.
I have rifles that shoot better accuracy somewhere between min/max and others that go above maximum. Whatever the case, when I find approximately where that sweet spot is, that's when I start to really home in on the best load for that rifle with 3 shots loaded with the same powder but in a much tighter window of powder load. It's basically a successive approximation method to more quickly home in on the best load with that particular powder/bullet combination.
Long winder answer to your question that you may have not been looking for I know. Bottom line is I use the published data to get me into a safe starting zone. I use the rifle to tell me where maximum is, albeit I may not find out if I first find the best accuracy zone.
I load for accuracy first and foremost. I'll take a 1" group or better at 100fps slower than a 2" group at 100fps faster everyday and twice on Sundays. I only exceed maximum published loads
IF accuracy is improving and my rifle is
NOT exhibiting high pressure signs. And if I do so, I do so very slowly.
Having had what I guess you may call an "over pressure event" in a rifle years ago, that resulted in a stuck shut bolt, I'm not inclined to ever go there again. It took putting the rifle in a vice, a piece of 2x4 and a hammer to get that bolt opened. And the brass that came out was stuck to the bolt face. Once the brass was pried from the bolt face, it was mighty ugly and the feeling of "Oh shit" that I had......well again, I'm just not inclined to go back there.