As a newbie would somebody explain BALLISTICS - BULLET WEIGHT AND RATE OF TWIST?

Why is 1-7 rate of twist good for heavier weight bullets..... what about 1-8 rate of twist?

Or for that matter what about 1-10?

What is the differenace between 16"-18" and 20" barrels at 100 yards out to 500 yards?

I have unfortunely become addicted to these black guns.

I have an SGW(OLY) preban CAR with a 16" medium weight barrel that works better than I can shoot.

Now I have put together a SOCOM Black Daimond lower and want to build or buy an upper for medium to long range shooting (200-500 yards)
and do not know which direction to head.

All imput and any opinions are welcome.

I am leaning towards an Oly maxhard upper with a 20 inch SUM barrel and I do not know what rate of twist to go with or if I should go with an 18."

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This is an extremely complicated subject.  For example, the twist needed to stabilize a bullet is actually dependent upon the bullet length rather than the weight.  Also, the altitude and temperature can alter how much twist is required.

If you are planning on using the 77 grain Noslers or 75 grain SMKs, the 1/7 or 1/8 twist barrels would work good.  If you are going to be using the very low drag match bullets, go with 1/7.

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