OzFclass

Pretty soon I need to have the .308 barrel on my rifle changed. There are quite a few barrels with a .307 calibre on the market. Does anyone know what the pros and cons are of these barrels.

Thanks

BC

My barrel is a 0.298" x .3065" krieger. Im not a big fan of it- it produced alot of copper to start with and has been finicky with loads. One minute it seems brilliant, the next I scratch my head a little. Its going to be relegated to hunting and varmint duties soon. Next one will be .300"x.308"- supposed to be a winner.

If you're talking about the .308 W calibre, I've got my best results from the larger diameters - a .300/.308 Kreiger & a Maddco, similarly generous. I was looking at the Kreiger only a week or so ago. I pulled it out after 5½ thousand rounds before I did Bendigo for the first F class teams. It still looks sharp & clean and was shooting perfectly before I retired it.

BC wrote:Pretty soon I need to have the .308 barrel on my rifle changed. There are quite a few barrels with a .307 calibre on the market. Does anyone know what the pros and cons are of these barrels.

Thanks

BC

Great for swaging down projectiles and stressing thin jackets. I think it had a role to play when shooting FMJ military projectiles? If you're keen I think there is still merit in the German squeeze bore concept.

Brad Y wrote:My barrel is a 0.298" x .3065" krieger.

The .3065" groove size worked well when we used ADI 144 which often measured .3072".

My current barrel is a True Flite .308 and I am using the Sierra 155gr projectiles. I like this barrel but I was wondering if I can improve my scores with a .307 barrel and still using the Sierra 155gr.

BC wrote:My current barrel is a True Flite .308

As a general rule for 30 cal 155g, we order our barrels in 307 4G, 3075 5R and 308 6G. (Lapping adds ~.0002")
The idea is to keep the length displacement of the bullet to within certain parameters.

Jim,

what do your barrel codes 4G, 5R, and 6G denote ?

Thanks

John

4 Groove, 5 R-form, 6 Groove have a read of
http://obermeyerbarrels.com/faq.html