quote: "1: I want to use FMJ's because I want to save the pelt."
I read where you stated that the reason you are going to use .243 is that you already have access to one. In that case, if you are wanting to save pelts, might I suggest using Hornady 58 grain V-Max ammo.
In years past, when I was still using a .243 (instead of .223), that is the ammo I used. The only time I had any bullet damage to pelts was if I hit a shoulder.
If I did my job & placed the bullet in the heart/lungs where it should be, the entrance hole wasn't any larger than any other .243 round. AND, unless the coyote was shot at "shotgun range", I rarely had an exit hole. But when I did, it wasn't any larger than the entrance.
2: I have already taken a hunter safety course and I try to be careful about those kind of things.
I have to admit that I fail to understand what taking a hunter's safety course has to do with ricocheting bullets.
I wasn't necessarily meaning that you need to know what is beyond your target (which obviously you do).
I was just stating what experiences I had had with FMJs continuing to travel thru the target, & then ricocheting off for who knows how much farther down the line before running out of energy.
A more frangible bullet will loose most, if not all of it's energy in the coyote, as well as break-up or deform much more than FMJs.
I've meant no disrespect in either of my replies to you, sir.
I've given you my opinions, based on my experiences. {19 years of calling coyotes, 41 years of overall coyote hunting; 20 years of deer hunting; 20+ years of small game & upland birds in my younger days.}
But, by NO means, do I even come close to thinking I'm some know-it-all about any topic. I'm realistic enough to admit that there are thousands-to-millions of folks out there who know a heck of a ton more about most topics than I do...including guns & bullets.
So, sir, if you are intent on using those FMJs, then go right ahead.
I've gave you my .13-1/2 cents worth of advice.
Have a great & successful hunt.