Does anyone have information on what Sierra bullet type is more accurate in the k hornet.I have both the 45g hornet#1210 and the 45g spt#1310.Eventually will try both but any experience would be appreciated.

Each gun is different, the only true way to know is to load some up and shoot them.

I can't predict the accuracy, but do know that the #1310 is made with a thicker jacket for use in larger cartridges at higher velocity. They may not expand as well at Hornet speed. There are times when that's what you may want, though.

Trial and Error.That's the only way to find out which does best.
In my Savage,the 40 grainers had a decided advantage over the 45 grainers.
Good Luck
Frank