What is the highest grain for the 243 that you guys know of.

105 grain is the highest I know of.

Do u know what company makes that?

Speer makes one. Most 105 grain bullets are more for target shooting than hunting. I believe Sierra makes one too. If you can't get it killed with a 100 grain bullet 5 more grains ain't gonna help.

Speer did make a 105 grain round nose which I didn't like as it seemed eager to shed cores. Maybe the hot cores are different.

You really need to say for what purpose.....for deer the 100 grain is about max but there's afew target bullets (VLD) that are much heavier.

Search and look at Sierra bullets and Berger as well.....

Nosler and speer make a 107 Grain bullet. i think Barns does too. If your looking for a Hunting bullet, use a sierra 100gr Game king BTSP
Or the nosler Balistic tip in 95gr. I also use the hornady 100Gr BTSP to hunt. That 100gr bullet with 3000fps FLAT shooting velosity will take down any game in north america out to 250 yards. Except a moose or Grizz bear.

Harry

Dont forget the 115 gr Barnes. Although I have yet to hear anyone say it groups worth a hoot.

unless you have the correct twist, stabilizing anything over the 100 gr bullets is difficult with a factory stock barrel... if you're really lucky you may get away with a 105... for the heavies though you need a faster twist than standard factory...

I use it for whitetail deer, the reason i was asking was because i heard of some guy using 85 grain for deer. i thought i would give it a try, well i shot the deer in the chest and it acted like it was just a bee sting, well anyway i was thinking of gowing on a good grain size for deer