They held the bullet weight down to the 150gr-ish range, and put the chambering into a heavier rifle with a 24" bore length and 1:10" rifling twist. For very accurate results, remember to account for the velocity lost in the 10-15 feet between the muzzle and the chronograph. I've also worked up loads using 180gr/165gr AB. A big consideration in what bullet weight to pick is the twist rate. For example, a 45 (.457) caliber rifle with a twist rate of 1 in 18″, should be able to stabilize a bullet up to 672 grains or 1.74″ in length. I don't know if that is for 30-06 … A 220-grain, lead flat-nosed bullet might stabilize in a 10-inch twist .30-06, while a 220-grain boat-tail spire point would be too long to stabilize. As for accuracy, the old -06 can do very well in a good rifle and a skilled driver. Most 30-06 barrels have a 1:10" twist, which usually work best with 165-168gr bullets. In the .22-250 Rem., the 12-inch twist rate usually stabilizes lead-core bullets from 40 … A 1:10 twist adequately stabilized the 220-grain round nose, which made it more than fast enough to stabilize the lighter, shorter bullets, so the 30-06 twist rate standard remained 1:10. 7mm bullets tend to be longer for caliber than .30 caliber bullets. As a rule of thumb, a bullet looses 5-15 fps in this short distance. Twist rates and bullet weight are often understood, … The various 7mm cartridges are typically factory-barreled between 1:9 and 1:10. I drew bear tag this year so going to use that 30-06. My favorite woodchuck rifle is a 7" twist .22-250 which is 1/2 moa with Sierra 53 … I have Bartlein 1/11 twist @ 26" on one of my 30-06 and I've been using 180gr Partition. Obviously, this isn't a match grade bolt gun, but I'm hoping for around 1-1 1/2moa to 300 yards. Uncle Sam got a lot of mileage out of the.30-'06 chambering. In .30 caliber, a 1:10 twist will stabilize a wide range of bullet weights. Any twist within this range will stabilize the most common 7mm bullets. I personally know a few guys with 1:7.5 Creedmoors that are having the Hornady Match projectiles spinning their jackets off on them mid-air. According to to Shilen, a 1 in 10 twist is good for up to 220 grain bullets. Today’s long, 220-grain, sharply pointed, boat-tail VLD bullets might not be stabilized by a 1:10 twist barrel. As we get faster and faster twist rates – this is becoming more of an issue. Not all bullets are created equal either, so that is why you still have to experiment with different bullet weights and see which one will work best in your rifle. My 30-06 hunting rifle has a 1-10 twist barrel on it, and it shoots 180 grain Nosler ballistic tips very well. How fast the bullet leaves the rifle as measured by a chronograph. Somewhat of a compromise regarding the optimal spec for the cartridge, IMHO; but clearly good enough to play a huge part in winning WWII. The 10 twist barrel should do the job? Maximum Weight of Bullet Stabilized (grains) Twist>> Optimal bullet length for a 1:11 twist would be somewhere about 1.30 inches, which should be any bullet between 165 to 185 grains. BUT, it's not really the weight that matters, it's the bullet length. Its not bullet weight. I have some Nosler BT's in 180gr, Hornady interlock 165 btsp, smk's in 168 and 175, and Speer target match 168's. I took pretty good mulie buck here Co with that 180gr Partition and I have other rifles so don't hunt with every year. Bullet length! A 1-12 would probably do just as well and possibly gain a little velocity in the process. Re: bullet weight for 1 in 10 .308? So, if you use something like all copper Barnes bullets then you drop down one weight size and use the 150gr. Length is the big factor here rather than weight. But I also have a 7.8" twist .30-'06 which stabilizes 240-grain bullets at the lowest velocity which exits the barrel and is little louder than a .22 LR firing standard velocity match ammo. Anyway, I pushed an oiled patch down the barrel and determined it is a 1 in 10 twist. He's leaving the bullet selection and load development to me.