Barrel twist and linning

[Blazer11]

Its the rookie again, thanks for you help on my last question

Anyways I decided on an 18 " barrel but now whats a good twist rate and a good linning?

[98Z5V]

What's the intended range, bullet weight, and purpose of the rifle?

[Robocop1051]

The two most common twists are 1:10 and 1:12.

The 1:12 likes the lightweight bullets. You can shoot heavier, but they won't stabilize well and you'll lose a bit of accuracy. I'd make 160 gr bullets my ceiling and try to shop more in the 150 gr area.

1:10 is prime for the big heavy bullets. You can shoot lighter and they'll still be accurate, but you'll wear down your barrel life faster. Too much pressure and heat from the lightweight bullets. 160+ grains will be fine.

A local sniper team was shooting their Rem 700 with 1:12 twists. They ditched the common 168gr for a better flying 155gr.

If you buy custom. They can make a 1:11 twist. I don't know too much about this twist. If you went this route I would suggest staying away from the extreme heavy and extreme light bullets.

[edgecrusher]

my obr has a 1:11.25

[survivalshop]

What's the intended range, bullet weight, and purpose of the rifle?

As said above , but the 1:10 is going to work with just about any std 308 bullet, out to the mid ranges . Ya just can't go wrong with that twist rate .

[Blazer11]

What about linnings . do some wear down more then others. People seem to like chrome because of clean up any other benifits?

[Robocop1051]

Chrome and Melonite barrels are corrosion resistant and their low friction surface enables longer barrel life.

Lined barrels aren't particularly known for super accuracy. That doesn't mean they're inaccurate.

If you were just plinking, there are plenty of affordable lined barrels. If you were going into a battle and your life depended on performance, there are several high end lined barrels to choose from. If you wanted to make 1/2" jagged holes at 100 yards, or you needed to make sure every shot landed EXACTLY where you wanted it, then a custom stainless steel barrel is your choice.

[survivalshop]

Fulton Armory has an 18" match chrome lined barrel with phosphate outer finish. It is final hand lapped after chroming & not a bad price , But I'm kinda partial to there barrel line.

Mine are all stainless steel & if you don't like the outer color , just paint it .

[jeffreyC]

Melonite is not a lining, but a surface hardening treatment which makes no dimensional change to the barrel.

It is best done to a barrel that you will make no further changes to, as it is harder than most tools used to cut steel.

[Robocop1051]

OH NO! Not this argument again. :hornet:

[survivalshop]

OH NO! Not this argument again. :hornet:

That ul learn ya , you started it, not me ( this time ) <laughs>.

[jeffreyC]

If you have an accurate barrel, send it off to be nitrided, that way it will be an accurate barrel much longer.

[CSM-H]

Got this off of "RifleGear"...seems to answer the question of lining or not....just thought I'd jump in...  :)    CSM-H

The unique Melonite treatment applied to the barrel surface-hardens the metal, extending barrel service life by reducing friction in the bore and lessening bore surface wear. Also referred to as Nitriding, this treatment produces an extremely hard, slick surface on steel that resists carbon adhesion and increases corrosion resistance, making for easier cleaning and maintenance. Nitriding converts the steel's surface without any build-up, retaining all of the benefits of traditional chrome lining without suffering the accuracy degradation commonly encountered due to uneven application of chrome inside the barrel's bore.