The 06 and the 300 Win Mag have the same twist - 1:10, which is why both prefer the heavier rnage of slugs and why they perform better in those calibers. The 308 has a 1:12 twist for the lighter 30 caliber slugs in the 125-165 range. I used to have a Wichester made Model 1917 that carried a left hand 1:10 twist which would should any heavy slug, no matter how hot it was loaded, all day every day and never bust its group.
I have to go with Lloyd that the 180s in the 06 are heavy for whitetail and a small hole in and a small hole out is typical of 180 gn 30-06 performance on critters less than 200 lb however, with that being said, er writ, the small hole ouot sort of belies the 'jelled' effect on the lungs and often the heart. I have put 180s right through or right across the top of the heart and had them go 50 yds without lungs or a functioning heart. Found the same with 308s in 180 gn weight but had to seriously handload a slow target/match load with a 180 to get it to shoot straight in my Rem 788. If the slug goes through the bottom of the heart it is as though the critter just stops right there and falls over with the entire bottom of the pumper gone and both lungs deflated but I would rather go looking than use 150s in the 06 due to the amount of meat damage should I not place my shots precisely. Just my preference.
Saddlebum: My M70s shoot much more accurately with the barrel free-floated.
PowPow: I don't think they do that - buy barrels in bulk for two different calibers unless they both use the same twist. I know Rem used the 1:10 twist in the 308 788s for a bit, which drove me nutz as I like the heavier slugs in the 30 bore and I found another shooter with a 1:12 twist 788 that shot the lighter wieght slugs (125-165) much more accurately than mine, no matter what I did to the loads, stock or whatever. Sort of bummed me out as he wasn't willing to trade or sell but that ended my sporting experiences with the 308.
