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Less for sure

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I know that the difference between most 24" and 26" barrels is about 150fps. So could a 30" add 300fps, I don't know.??.
If that's true, you could get magnum velocities out of standard calibers.

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Yea, I need to get over that way and meet up with you. Since I'll be on an involutary and permanent vacation after Friday, I should have plenty of time next week.

Take a look at this article...
Velocity changes in barrel lengths

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Take a look at this article...
Velocity changes in barrel lengths

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Take a look at this article...
Velocity changes in barrel lengths

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About a 160 ft +\- a few. that would put me @ 3725... thats pretty hot for a 100 grain TSX pill.

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Yep. You could always drop down to the 80 grain Tipped TSX. That should push you over the 4000fps mark.

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I know that the difference between most 24" and 26" barrels is about 150fps. So could a 30" add 300fps, I don't know.??.
If that's true, you could get magnum velocities out of standard calibers.

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Thinking about getting a 30in 257 wby encore barrel or the 257 stw in the classified. Just wondering how close I could get the 257 wby mag to the 257 stw using barrel length. An encore with a 30 in barrel would be about the overall same length as the 257 stw w/a 26in barrel

I still got those 22-250 shells

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I know that the difference between most 24" and 26" barrels is about 150fps. So could a 30" add 300fps, I don't know.??.
If that's true, you could get magnum velocities out of standard calibers.

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Thinking about getting a 30in 257 wby encore barrel or the 257 stw in the classified. Just wondering how close I could get the 257 wby mag to the 257 stw using barrel length. An encore with a 30 in barrel would be about the overall same length as the 257 stw w/a 26in barrel

I still got those 22-250 shells

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Good luck finding a .257Wby in an Encore, I looked for along time before calling a custom bbl mfr. I was told that it could be done but they would not warranty the bbl and I had to hand load it way down, not to use factory ammo the pressures are too high. The free bore is the issue here I think.

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Right 30 inch! wow! make sure you put a red light on the tip of the barrel when you have it on your shoulder! You won't want to get it caught on any helicopter blades!!!

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i'm just messing with you. hell try it! just let us know what you come up with.

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I know but 30 in barrel on the encore kind of defeats the whole reason I went to the encore

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30 inches is a long barrel. I didn't read that article, but I'm not sure that the velocity would keep increasing at the same rate, mainly because the gases expand only so much. The farther they get from the chamber the slower they expand, although I have no idea how much. I think its safe to go off the 150 FPS rule though.

As far as loading the 257 Wby Mag, just make sure you work your loads up properly and you will know when the pressures are getting too high.

Another thing, you don't have to have extremely high velocity to have a long distance rifle. All of the shooting media stesses magnum calibers, acting like if you don't have an extremely fast shooting magnum caliber you will never be able to take game at 500 or 600 yds. That is false. A 30-06 is a very capable 600 yd round, (with the right bullet of course). Most shooters should not be attempting shots at more then 300 yds anyway, especially if they have never practiced firing at that distance.

The US military Sniper round is actually a 175 gr .308, at 2600 FPS, and has way more drop then all the magnum calibers. Does that mean it is not a long range caliber? Heck no. The effective range of a .308 sniper rifle is 1000 yds.

You'll be fine if that round stays around 3200 FPS. Don't worry too much about velocity, accuracy should be your main concern.

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Probley would never take a shot over 350 yards at any thing other then a yote. Already at 3330 on my 25-06 with a 100 grain tsx, but getting a 100 grain tsx in a 25 cal up to 3800-4000 range... thats a pill that will have some serious RPM's....