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I'd like to point out that the 1:8 twist rate allows you to not only shoot the heavies quite accurately (220-240gr) but will work quite well with the lightweights as well. We have fired 100gr plinkers with good results in the same guns we were shooting 240gr matchkings. The converse however is not the case. I have done a repair on a suppressor for a customer who learned the hard way that you don't want to shoot the 220's out of a 1:10 twist barrel subsonic. Wiped out 3 baffles and the endcap. If you are planning on benchrest shooting of the 300 than you should really pick a particular bullet you intend to shoot and choose the twist rate for that but otherwise choose a twist for the heaviest bullet you shoot and the lighter ones will work too. Overstabilizing of bullets is not normally a problem unless you are shooting extreme ranges, are doing indirect fire at extreme range or if you are shooting very thin jackets at high velocity. The faster twist will spin the bullets up to very high rpm if you get the velocity up. The 100gr plinkers at 2600fps were spinning pretty fast but not enough to blow the jackets up. Some varmint shooters find that they blow up the bullets by overdriving them and there are those who have posted on these boards that this is a concern for our 300's as well. I don't think that is the case however as we cannot load enough powder in the case to get the velocity that will do that. The bullets we use are not superthin jacketed either so the strength is there and the loads are not. Bottom line here is that if you intend to shoot subsonic than the heavy bullets are best for that. They carry the velocity longer and the energy as well. 1:8 is the best rate for those bullets. If your interest is strictly supersonics than 1:10 is fine.
You must choose.......
Frank
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