Velocity affect accuracy ?

[45man]

Twist rate is always the defining factor for the velocity needed.

 

[cjgregory]

Th

Twist rate is always the defining factor for the velocity needed.

There is some truth in that.

 

[LME]

Th

There is some truth in that.

Only with B.P.!
With modern rifles a magnum Cal. has a faster twist rate than a conventual cal. due to different powders burning at different rates. slow burn for magnums allows bullet to get faster as it travels down the barrel while gas pressure keeps building up allowing the bullet to exit the barrel at a high rate of speed.

 

[cjgregory]

Only with B.P.!
With modern rifles a magnum Cal. has a faster twist rate than a conventual cal. due to different powders burning at different rates. slow burn for magnums allows bullet to get faster as it travels down the barrel while gas pressure keeps building up allowing the bullet to exit the barrel at a high rate of speed.

True.

Only with B.P.!
With modern rifles a magnum Cal. has a faster twist rate than a conventual cal. due to different powders burning at different rates. slow burn for magnums allows bullet to get faster as it travels down the barrel while gas pressure keeps building up allowing the bullet to exit the barrel at a high rate of speed.

With my match M1’s, the barrels are twisted for my bullet length. A longer bullet requires a different twist.

I keep my bullets close to 2800 fps. My loads have not changed in three years. They are spot on. The rest is all me. Win or loose.

 

[LME]

True.

With my match M1’s, the barrels are twisted for my bullet length. A longer bullet requires a different twist.

I keep my bullets close to 2800 fps. My loads have not changed in three years. They are spot on. The rest is all me. Win or loose.

That is about normal speed for a 30 06 round. 2600 to 2800 FPS!

 

[cjgregory]

That is about normal speed for a 30 06 round. 2600 to 2800 FPS!

There’s plenty of room to drive it faster but accuracy falls off quickly. Case in point for the thread. It’s under 2800 but I don’t know exactly what it is unless I look in my log book. The last two matches were cancelled due to weather.

 

[tenngun]

Correct. The idea is to get the bullet to exit the barrel in the middle of the harmonic cycle. It takes time to work up a load, but you only have to do it once.

Hmmm.
Even the same load will have a fifty fps difference in velocity, and Swiss, GOex shutzen and graft and sons all vary in power
That makes me wonder how you can hit that sweet spot in the harmonics

 

[tenngun]

This brings up the question again. Is the bullet exiting the muzzle before or after the recoil? I would think before, otherwise, even with good recoil abilities we wouldn't be able to shoot the tight groups that are achieved today.

I think the recoil aspect is the shooters response to it
Much like the flash of a flint lock new shooters can jump off target. If one can’t handle the recoil well trigger pull can be accompanied by a flench that throws one off target