Can Someone Explain Rifling

[lineofsight]

No, rifling does actually throw weaker demons off of bullets and makes the rest too dizzy to interfere with bullet flight. You can hear them scream in frustration when they fall off during richocetts. Longer bullets have more seating room for demons, therefore must be spun faster.
Bullets also kill by letting light inside animals. Not everyone knows that.

This proves my theory that you have to have a sense of humour to live in Saskatchewan

 

[tiriaq]

It was established in the 1500s that rifling improved accuracy by frustrating the daemons.
warrenb - it is the length of the bullet, not the length of the contact surface that is related to the rifling twist.
A quick twist .22-250 will really shoot well with 80gr VLD bullets.

 

[Boomer]

Sorry I'm back on this trip.

When examining the effects of rifling should we take into account the total bullet length or just the area that touches the rifling?


For example. Sierra 60 grn HPs are 0.74 in length and Nosler 55 grn Bal tips are 0.834. The BTs are longer but I think from the shape there may be more percentage area of the HPs that touch the rifling.

thanks guys.

A very long bullet may have a very short bearing surface due to its long nose and boat tail, and this long bullet is the one that requires a faster twist. A bullet of equal weight that is flat based with parallel sides, and a flat or hemispherical nose is as short as it can be made in that caliber and weight, and this bullet can get by with a slower twist.

In the real world, any given twist will stabilize a fairly wide range of bullet weights. My preference is a quicker twist, because I like heavy (long) for caliber bullets. I never found a .224 bullet that would not stabilize in my 1:7 twist .222 Gaillard, and this barrel shot light bullets very well. My 1:10 Lilja .243 will not stabilize a 107 gr MK. My wife's 1:12 twist .30/06 won't stabilize the 240 gr Woodleigh, but my 1:10 twist .30/06 does. My 1:8 twist .308 will stabilize the 240 gr MK, but my 1:10 twist .30/06 will not.

A concept that is put forward in the A-Square loading manual is that a fast twist barrel can improve the terminal performance of a bullet on game. The example given was a pair of .458 rifles, one with a 1:16 twist and the other with a 1:10. The 1:10 twist barrel consistently out penetrated the slow twist barrel, and the explanation was that the bullet with the faster rotational velocity more easily overcame the torque that occurs when a spinning object meets resistance. The faster spinning bullet precessed (yawed) less, thus had less friction working against its forward progression.

 

[warrenb]

Great guys. I finally got my answer.
Just goes to show you have to ask the right question.

So the longer 55 grn ballistic tips "should" work better than the shorter sierras in my 9 1/8 twist rifled 243. Thats if they work at all.

I will refrain from mentioning the Spanish Inquisition in my future posts.

Oh and Boomer you have a good knack for explaining things.