Hmm... you're forcing me to actually give this some thought.
Fat chance of me hunting. The only hunting i'll be doing is the one in my dreams so its gotta be the targets out at the DHSC. I'd like to be able to put my mark on the smallest of the steel targets at each distance but that's asking for a lot given the size of those targets. So we're talking 240, 320 and 440 yard distances.
Sounds like there is a lot of researching and a great degree of experimentation and guess work to get it right. Also, sounds like one could possibly shoot out his barrel before finding out what's best. I never really thought of looking at the rifle as a starting point as opposed to the bullet so that's something I need to do. I plan on doing some reloading for my Tikka T3 SS chambered in .270 Win and some .223/5.56 for my AR but accuracy for the latter is not that great of a concern for me as my bolt gun...at least for now since I don't do any competitive shooting with my AR15.
For the .270... I am not really familiar with this caliber. It is widely use for hunting applications, I mostly punch holes in paper, so not sure of what type of bullets it will work well with. I am sure that the Sierra Match King will be a good quality bullet to try. However, the twist rate of your barrel will dictate the heaviest (longest) bullet you will be able to use. The longer/heavier bullets will require a faster twist to stabilize the projectile. For longer range and least wind drift the heavier bullets are advantageous. However, the targets at KHSC?(DHSC) distances most any bullet weight suitable for your rifles twist rate will do. Sierra Match Kings are not suitable for hunting, as they will not expand, so if you ever think that you will do any hunting, you would need to work up a new load with the desired bullet suitable for hunting.
For .223/5.56 target applications you can't go wrong with a Match king or you could try the Nosler Custom Competition bullets, again in a weight that is suitable for your barrel twist rate. An easy load might come with the 69 grain pushed with some h335 at a modest velocity. Be sure to seat primers BELOW FLUSH for any rifle with a floating firing pin to minimize the chance of slam firing. For KHSC the short distances involved there is no real need for blistering speed. You will just be wasting powder and unnecessary wear on your gear.
Do lots of research on the correct powder and primers to use, confirm and reconfirm load data from reputable sources, weigh your charges on a GOOD SCALE, and work up loads to best accuracy and don't look for the speed as the major concern. Check your cases frequently for case wear and failure signs. BE SAFE!
Working up a load doesn't need to take up a lot of components. try reading up on...
http://optimalchargeweight.embarqspace.com/Much Info here on ultra accurate reloading theories...
www.accurateshooter.comsome other discussions...
http://2ahawaii.com/index.php?topic=3712.0