Rifle bullet weight question

[yqtszhj]

Can someone briefly explain to me the bullet weight, rate of twist in rifling, and velocity relationship?

I understand some faster rate of twist rifles like heavier rounds and slower velocity for more long range accuracy , but what about lighter rounds and slower velocity?

Just a general question while trying to find the best round for a new rifle purchase. I understand every rifle is an individual too But I'm just trying to wrap my brain around it.

[pbagley]

In very broad general terms, the greater the ratio of length to diameter the more twist is needed to stabilize a projectile. Round balls will have a 1:1 ratio, and they require a very slow twist, some where in the 1:20" or 1:30" range. A longer bullet will have a larger ratio of length to bore size, and that will require a faster twist. For example a .223 55gr seems to stabilize well in a 1:10" twist while a 62gr. needs a 1:8" or 1:9". Next question is whether you can over spin a projectile. If you use a .223 1:8" twist barrel with a 50gr projectile will it be less accurate than if you use a 1:10" or 1:12" ?

Now I step back to let the real experts weigh in.

[yqtszhj]

That was kind of my understanding on the heavier the bullet the faster the twist. I had not heard the length to diameter ratio but it makes some sense.

[muggsy]

Can someone briefly explain to me the bullet weight, rate of twist in rifling, and velocity relationship?

I understand some faster rate of twist rifles like heavier rounds and slower velocity for more long range accuracy , but what about lighter rounds and slower velocity?

Just a general question while trying to find the best round for a new rifle purchase. I understand every rifle is an individual too But I'm just trying to wrap my brain around it.

This should clear things up for you. Read carefully, there will be a test. :)

http://www.fulton-armory.com/%5Cfaqs%5CAR-FAQs%5CARTwists.html