Will it work in my 1 in 10" twist short action 257 Roberts?

No. This bullet requires a 1:8" or faster twist to stabilize. This is what we mentioned how it won't work in any factory 25 caliber barrels. It will have to be a custom barrel.

Logan, thanks for jumping in and the info.

Agreed.

My next question is what has barrel life average shown to be in the X47, and the Creedmoor case?

Next barrel, I may very well go this route. I'm a sucker for BC, and some bullet weight. I had decided to abandon my typical 1:8.5 6.5mm, with 140's, and go to a 1:8 6.5mm with 147's, but this has my attention.

Very nice, Logan! Thank you for joining and chiming in! I'd love to pick your brain some more on these bullets. If G7 of .330 is legit, then that .257" caliber bullet is more steam lined than almost any other bullet out there. I built a rifle around the 7mm 195 Berger bullet, and it's been spot on. It's a very slick bullet. Something lighter, just as fast, and high BC is attractive.

How's this bullet done as a hunting bullet?

We started this project to design the most efficient for weight bullet we could. With a lot of time and math we pulled it off! When you take off the barrel twist rate restriction that has handicapped the .257 bullets forever it really makes a ton of sense. Thankfully most of the barrel manufacturers were excited when we told them what we were doing and decided to make the fast twist blanks that are needed. Basically the same exact thing that happened with .243’s years ago!

As far as hunting, 3 elk from 200-450y, 5 mule deer out to 660y have gone down with a 22” 25creed running 2915 FPS. Hand fulls of whitetail with the longest being 860y with 25x47 @ 2900-2930 fps. None went more than 30y from where they were shot, all pass throughs except the whitetail at 860y which stopped under the hide on the back side shoulder.

A slew of coyotes have gone down the my x47 and 25 SAUM

These hunting results are actually surprising to us but it’s definitely a pleasant one!