Go with the lighter bullets some 12 twists won't stabilize the 40 grainers. Seems people have better luck with the 39gr. Sierra in 12 twists.
This is not correct. The **Hornady** 40 won't always shoot well in a 1-12" twist. I've never NOT had the Nosler 40 grain shoot in a 1-12" twist. The weight doesn't really matter, it's bullet length that matters and there's a lot of difference in length within any given weight. The Hornady bullet has a pretty exaggerated boat tail, which is why it's BC is higher, but that makes it longer, too.
My first PacNor 1-12" twist barrel wouldn't shoot the 40 grain Hornadys well. The current one, also a 1-12" twist PacNor, shoots them around half inch.
You are, however, right in that the 39 grain Sierras tend to shoot very well. Same situation .. they have a much less pronounced boat tail and are shorter like the 40 grain Nosler.
I have a box of the 39 grain TNTs .. haven't gotten around to trying them. The 45 grain Hornady shoots real well in my guns. Being a flat based bullet, it's short for its weight.
I haven't tried the 32 grain Sierra in my gun. Both the 32 grain Nosler and 32 grain VMAX shoot very well.
Tom
