Re: 110 fmj in a M1A
One of the pitfalls of deviating too far from the "standard" weight bullets of a particular caliber is bullet stability.
A bullet must spin with a minimum rate according to the Greenhill formula. This limits how long (which usually means how heavy but not always as it depends on the shape of the bullets nose) the bullet can be and still not wobble on the way to the target. Get it wrong and the accuracy can be terrible. The 168 grain Match bullet is about as heavy as you may want to go with a 1 in 11 twist, according to Greenhill.
On the other end of the scale (your situation) if the bullet is too light the hyper spin rate can tear it apart. In some cases the bullet may never even reach the target and explode from the rotational speeds the bullet was not made to handle. My experience with 52 grain "normal" bullets in a 1 in 8 twist 223 showed me that in spades, as the bullets never reached the target but disintegrated along the path to the target. A better match grade 52 gr bullet did make it to the target but the barrel really liked heavier bullets around 70 grains and gave much better accuracy with them. The 110 grainer bullets in 308 require a minimum twist rate of 1 in 17, a long way from 1 in 11 as in your gun. While you may not have trouble, the numbers say you might.
110 grainers are a long way from the "standard" weight of 308 bullets and may be a problem. The way to still use those bullets is to reduce the velocity (a lot) but that kind of defeats the concept of fast light bullets. I think most 308 M1A shooters get the best accuracy from the match 168 grainers but of course every gun is different and yours may like some other weight and design bullet, like a 150 gr match bullet. You'll only know by trying them all and developing loads for each one.
Last edited by LDBennett; 10-05-2008 at 08:16 AM..