Let's take a look at the various types of loads available:
Promotional loads: These are the shells sold for less than $10 a box of 25. It's possible to sell them that cheaply because they use soft lead and no buffers. This results in a lot of deformed pellets and flyers, with subsequent large patterns. Great for practice and fooling around, not what you want for serious hunting.
Hunting loads: These are more expensive, say $19.95 per box of 25, because they use harder lead and buffers to provide less damaged shot and tighter patterns. About 80 cents a round.
Turkey loads (lead): These are designed to produce extremely tight patterns that produce best results the way turkey shotguns are fired; aimed like rifles at stationary targets. They are more expensive still, roughly $15 per box of 10, or $1.50 a round.
Turkey loads (heavier than lead) These very dense pellets allow you to use a smaller shot size while still being heavy enough to penetrate. You can therefore use a smaller shot size and still keep enough individual pellet energy for an effective kill. The larger number of small shot keeps pattern density up. The drawback is the price, $25 for a box of five, or $5 a round.
Tungsten shot: If you want to have making the ultimate shotshell as a side hobby, you can buy extremely expensive tung$ten $hot and load your own. You'll get
amazingly tight patterns and fantastic penetration, but at a ridiculous cost. Just the thing if turkeys start wearing helmets.
So what should you buy? It depends on how far away you plan to shoot. At ranges less than 30 yards you can shoot just about anything. If you’d like to shoot from 30-40 yards, you should pick the load more carefully. Take a look at this study:
http://www.wildlifedepartment.com/hunting/turkey_loads.htm
You can poke a hole through a target with almost anything, but keeping both pellet energy and pattern density together at 40 yards is more challenging that some people think.
If you want to go past 40 yards, it’s time for the heavier than lead loads. And if you simply must have the hardest hitting load possible, import some tungsten and roll your own.
Personally, 40 yards is as far as I can see in the woods where I hunt. I don’t like to hunt open fields because if you can see the gobbler 60 yards away, then he knows the “hen” can see him and it’s just too easy for him to hang up.
I’ve used these with great results:
http://www.winchester.com/Products/shotshell-ammunition/supreme/turkey-loads/Pages/X123MXCT4.aspx
Yes, they are more expensive than hunting rounds, but my state has a 1 a day, three in possession limit. That means I shot a box
once to sight in / pattern ($15) and less than $5 per year
max on hunting. More to the point, the
difference between hunting loads and turkey loads is $7 once and maybe $2 a year. Seems like a bargain to me.