Painless load development (mine)

[Castle Rock]

Both probably, the 107 may get you a bit more speed due to less bearing length, but I would back off a bit on the next loading if I was you

 

[HuntHarder]

So virgin brass can handle a bit more with out showing pressure? Or am I past pressure due to velocity?

I'd back off a grain or more. You have ejector marks on Virgin brass. On once fired, your bolt is likely to be a stiff open, if it isn't already.

 

[huntsd]

I'd back off a grain or more. You have ejector marks on Virgin brass. On once fired, your bolt is likely to be a stiff open, if it isn't already.

Are you taking about the circle on the “w”

 

[HairyScandinavian]

So virgin brass can handle a bit more with out showing pressure? Or am I past pressure due to velocity?

You may already know all this but this helped me a lot recently. https://primalrights.com/information/understanding-pressure

 

[HuntHarder]

Are you taking about the circle on the “w”

Yeah, flattened primer, ejector marks on Virgin brass is usually a no go for me. I have had to drop 1.5 grains on once fired brass if I was already seeing signs on Virgin. I now make a point to have no real signs of pressure on virgin brass. It just doesn't leave you much room error.

 

[HairyScandinavian]

Are you taking about the circle on the “w”

Kinda looks like a wee raised lip around the firing pin strike, whatever they call that.

 

[huntnful]

Yeah, I probably credit cartridge too much when a lot of it is good blank, machined well, and good components = shoots tight. My buddy just got a benchmark and a bartlein chambered in 260 rem from same smith and they both hammer. This one is a krieger.

For sure man. I don't necessarily disagree with you at all either. I've just seen a lot of random bullshit cartridges with basically zero data shoot really good too. And they would have shot substantially better yet if the guns weighed 5 more pounds. Your groups are certainly exceptional though, but I do think more of the precision comes from component choices and build specs, before the actual chamber selection itself. Those 144's sure are a great shooting bullet. I may hunt with them this year. They put a hell of a hole in a couple coyotes and a coues buck last time I tested them.