A question about .223 twist and serial numbers

[xhare]

I would search for this but I cant get the search function to work.  I was wondering when exactly did NEF go with the 1:9 twist on 223 barrels and what serial numbers correspond with this change.  I am interested in shooting heavier .223 bullets in the 60-70 grain weight category.

What was the twist rate on the older .223 barrels?

[quickdtoo]

It's in the FAQ and Help sticky. There's no cut off by serial number, even H&R doesn't know, other than the 2006 fluted barrels are 1:9", early 2005 were still 1:12". The only sure way is to check with a tight patch and jag.

Tim

[Fred M]

Anybody that has a 223 with a 1-12" twist should be very happy. The 223 is a 250 yard varmint rifle and shoots well with the lighter bullets. Why introduce a rainbow trajectory with heavy slugs that are better suited for a 6mm.

Smoke the varmints with high speed light bullets and flat  trajectory path.

[GregP42]

I'm with Fred on that one. 35gr pills at 3650fps out of my handi and they hold about 3.5" at 300 yards. Watch the whistle pig go boom!

Greg

[Fred M]

Yah Greg that is the way to do it. I shoot 55gr V-max bullets in my 6mm x47 (222Rem Mag case) at 3500 ft is is almost the same case as a 223, fast and vicious on varmints. This rifle used to be a 223 but did not shoot to my liking so I had it rebored.

[6mmruger]

Xhare I have one with teh 1:9 twist and it does not like the heavy bullets.  Shoots 45 grs better than any.  Like was mentioned above if you want heavier bullets go to the 6mm family. MY2cents.