215 Berger…Short barrel….fast twist

[shooters]

215's shine with 1:9 twist. I'm having a 300 PRC built. Was suppose to be for 245's but with a 22" barrel I'm afraid Ill be disappointed in the performance. So I've considered sticking with the 215's. How much velocity loss going from a 1:9 to a 1:8?

And if I did stick with the 245's, I wonder if a guy could hit that 2800fps with N570

 

[Flyjunky]

215's shine with 1:9 twist. I'm having a 300 PRC built. Was suppose to be for 245's but with a 22" barrel I'm afraid Ill be disappointed in the performance. So I've considered sticking with the 215's. How much velocity loss going from a 1:9 to a 1:8?

And if I did stick with the 245's, I wonder if a guy could hit that 2800fps with N570

From what I understand twist rate is not going to affect velocity to a noticeable amount, too many other factors are going to have a greater influence.

Take a look at this
http://bulletin.accurateshooter.com/2015/02/does-barrel-twist-rate-affect-muzzle-velocity-litz-test/

 

[Shane Lindsey]

215's shine with 1:9 twist. I'm having a 300 PRC built. Was suppose to be for 245's but with a 22" barrel I'm afraid Ill be disappointed in the performance. So I've considered sticking with the 215's. How much velocity loss going from a 1:9 to a 1:8?

And if I did stick with the 245's, I wonder if a guy could hit that 2800fps with N570

Not a PRC, but I shoot the 245/N570 in my 300 RUM and can only get to 2830 FPS with a 27" barrel. It is not a fast barrel, but even at 2700 ish you are still good to 900 yards (sea level).

Can you get 245s? or even 215s?

 

[asd9055]

You might hit 2750. You'd just have to see how much powder before you hit pressure.

 

[shooters]

Not a PRC, but I shoot the 245/N570 in my 300 RUM and can only get to 2830 FPS with a 27" barrel. It is not a fast barrel, but even at 2700 ish you are still good to 900 yards (sea level).

Can you get 245s? or even 215s?

Thanks. I have a 300 RUM as well but haven't made it that far yet.
And yes, I have lots of both.

 

[Shane Lindsey]

I see some guys post some pretty incredible numbers with the 245/300 PRC, but I just pressure up to fast. Only way to tell is test it.

I like short barrels. I have a 20" 308. I just put together a 338 Sherman with a 22" barrel. Going to do some FF today.

 

[CA48]

Twist won't make a difference in velocity. There will be no advantage in running the 245s that slow just more recoil.

Stick with the 1&9 and run berger 200,205,208, or 215s. You could do that with a 1&10 twist to but 1&9 would help if you wanted to run the 230s from berger, Sierra, or Hornady. 215s and under will be a better fit all around with out knowing the purpose of this rifle, whether it be a light hunting rifle or a heavy target gun.

 

[shooters]

I see some guys post some pretty incredible numbers with the 245/300 PRC, but I just pressure up to fast. Only way to tell is test it.

I like short barrels. I have a 20" 308. I just put together a 338 Sherman with a 22" barrel. Going to do some FF today

Twist won't make a difference in velocity. There will be no advantage in running the 245s that slow just more recoil.

Stick with the 1&9 and run berger 200,205,208, or 215s. You could do that with a 1&10 twist to but 1&9 would help if you wanted to run the 230s from berger, Sierra, or Hornady. 215s and under will be a better fit all around with out knowing the purpose of this rifle, whether it be a light hunting rifle or a heavy target gun.

I already have the Bartlein barrel in a 1:8 ready to go. Too late for me to do a 1:9. That's why I was curious on if the 1:8 would work. We originally bought the barrel for the 245's but now want to go back to the 215's

 

[Shane Lindsey]

Mine is a 1:8 and it does great with the 215.

 

[CA48]

Agreed 1&8 will be fine. I run 215s at 2950 out of a 1&8.

 

[JAYgs8163]

I've experienced faster twist barrels can pressure up quicker for sure, especially when running the same load on a lighter weight bullet and the only variable is a faster twist barrel.