I want a good handling deer rifle in 308. What is the shortest length barrel I can get in 308 and it still burn all the powder and stabilize the bullet. I would like for it to be good for up to 300yds. It will be a barrel for my encore.
In principle I agree with the 2 previous comments from shot1 & charles p, the 20" is quite nice & gives a good balance of handling & velocity. Keep in mind that a 20" tube on an Encore will have an overall length aprox. the
same as a 16" tube on a bolt gun, which is a dang short gun. Even though I feel the 20" is about right, you can
go down to 18" & still get decent vel., though your blast changes, vel drops too much for my taste below 18" for sure. I recently worked up loads for a friends DPMS with a 16.5" barrel, the vel. was pretty much
the same as an average 30-30AI with a 20", for my uses unacceptable. By the same token, vel. per inch gain gets less after 24" with this modest case. Again, for your use & most uses, 20" makes alot of sense.
Also, when the tube gets shorter than 20", blast & noise increases, not too bad with an 18", but I did note an
obvious diff. with the DPMS 16.5".
You can go to Snipershide & SniperCentral & get pages of info on this subject to help you decide, you will see the 20"
is the direction most go. As far as twist goes, 1-12 is fine for 175gr & less, not to say they won't shoot heavier, just going with optimum here, I would rather go with 11.25 or 1-10 for heavier bullets or the shortest tubes where vel. can drop off.
Here is a couple of bery good articles on this subject:
http://www.6mmbr.com/308Win.htmlhttp://www.tacticaloperations.com/SWATbarrel/Notice in this one they even advise a 22" on the 300 Win Mag in general, however they make an exception if you want max. vel with the heavy bullets. To me, that's what a 300WM is all about, hence I use a 26" in the 300WM.
Good shooting.