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Yep, don't do it, the .257 WBY sucks! My .257 WBY with 1:7" propels the 145 Black Hole at 3100 FPS and the 163 Chinchaga at 2915 FPS with more room to spare. Not too shabby out of a 22" barrel. The 180 Chinchaga is coming out soon.Eh, no not really, i know bullet selection has gotten better for the .257 and 277 calibers, but im gonna stick with a 6.5, not mainly because of bullet selection, but my friend has a 6.5-300 WBY and i want to be on par with him. I like competition just a little lol
180 grain in a 257??
Never knew they got that big! Thats a big bullet for caliber holy crap!
Holy cow what is the BC on that?!?!?!?!? When HMR Johnny suggested a .257 WBT I thought yeah that would be interesting. A 180gr in it is crazy.
No info yet from the manufacturer. But for reference the G7 for the 145 Black Hole is .371.
So how many steps necking down and will you have to turn necks? 44 thou or so is a big step down.
Do thisWhat he ^ said.
What are you wanting to hunt (or shoot) with it? Also, consider barrel availability this time of year may start getting sketchy. It may be fun to build a spicy .270 cal of some flavor (again, depending on what you want to do with it....).
If you reload, it makes a bit of sense to stay in the 7mm bore and chamber choice is all about determining how long you want the barrel to live.
I went with a 7mm/300 Win mag and it is pretty cool. It's fun to use something no one around has (in my immediate vicinity anyway). With the Remage set up, I can buy another barrel (something .338 RUM like) and have some variety.
I do have a varmint contour Criterion barrel in 7mm Rem Mag, but probably just need to sell it along (maybe 50 rounds through it before deciding to assemble a harder-hitting, lighter hunting rifle). It just sits on my bench all lonely and sad.
7-300 win mag would be my choice.I probably wont neck turn at all, i have sized 6.5 Creed Lapua brass down to 22 Creed and i have had 0 problems with the necks. I just sized down 6.5 PRC to 6 PRC also with no problems. I think i should be fine if i were to do a 6.5-300 PRC
