T/C Pro Hunter with 28'' barrel

[UCM Tails?]

When loading for a longer barrel will pressure be higher than what is published in the books?  I just got one in 22-250 and was just wondering.

[Davemuzz]

Pressure will be the same if your barrel is 14" or 28". What will be different is the velocity. The pressure spikes shortly after ignition but the force of the explosion "pushes" the bullet down the barrel. Now, if you have a short barrel, that force doesn't have long to push and thus, the bullet's velocity will be less than if it travels down a longer barrel....cause the force has a longer "tube" to push the bullet down, and this will increase the velocity of the bullet. (to a point. If you put a 8 foot barrel on a gun I don't think you would see much of a velocity change between that and a three foot barrel....but I am guessing at the lengths.).

Look at it like you were being pushed in a little red wagon. If someone were to push you for 4 feet and let you go vs. pushing you say, seven feet. You would be going faster being pushed 7 feet.

Dave.

[victorcharlie]

Look at it like you were being pushed in a little red wagon. If someone were to push you for 4 feet and let you go vs. pushing you say, seven feet. You would be going faster being pushed 7 feet.

Dave.

Not if max speed were accomplished in the first 4 feet......the extra 3 feet would only use additional energy and would be less efficient as it uses more energy.....I.E short mag versus RUM.....Rum burns 34% more powder for 5% more velocity.....

[Davemuzz]

Not if max speed were accomplished in the first 4 feet......the extra 3 feet would only use additional energy and would be less efficient as it uses more energy.....I.E short mag versus RUM.....Rum burns 34% more powder for 5% more velocity.....

VC...Well....yeah....but I was assuming you were not being pushed in that wagon by your chubby cousin while she was eatin an ice cream cone!!!!!

[victorcharlie]

Not if max speed were accomplished in the first 4 feet......the extra 3 feet would only use additional energy and would be less efficient as it uses more energy.....I.E short mag versus RUM.....Rum burns 34% more powder for 5% more velocity.....

VC...Well....yeah....but I was assuming you were not being pushed in that wagon by your chubby cousin while she was eatin an ice cream cone!!!!!

Sorry Dave.....the point I was trying to make is that there is an optimum length for a caliber, and after that length there is little if any benefit from adding more inches........

[nomosendero]

This is true, some of the chamberings will be a good bit faster in the 28" & some will be only a little faster. The 7mag & 300WM for example with the right loads should be very good. I don't think the 22-250 will show much more than a 25-26" barrel would, but
it won't hurt anything either. I am considering buying the 7-08 & rechambering to 280AI. Nosler sells the AI brass now & it will give
me the velocity of a 7mag in a 24" bolt gun. Most people should buy a 7mag Pro Hunter barrel & be done with it, but I like the 280AI
more. Besides, some people I know who are very knowledgeable on the Encore design tell me that I can get a little more precision
with the 30-06case head size with the Encore frame than the belted mag head size. At least it will be a fun project.

[Davemuzz]

VC...Yeah, I agree with you on that issue. I think I was trying to say that, but I don't know if I was successful at it.

NDO, I agree with you on the caliber issue. I got a sebenthirty waters barrel 14" for CHRISTmas, and I was doing some reading on this. I read (in more that one place) that the rifle barrels in this caliber are actualy less accurate than the pistol barrels. Now, I dunno if that's true, or why that would be true, but I guess anything is possible.

Dave.