Better bullet for 1000 yards

[Gusmeister]

Would i be better off loading 107smk or 123 smk for 1000 yards? Will be fired from a 22" jp supermatch barrel in a stright pull ar rifle. Will the speed of the 107 help more than the weight of the 123? Thanks

That is an excellent question. Let me add asking if a TMK bullet will do better at 1000 yards than an SMK? The only way I know is to work up loads and go shoot them. My own experience is with a 20" Odin Works barrel in an AR. The 123gr Hornady ELD shot very well out to and including the 700 yard target. The next Target is a bit over 1,000 yards and the bullet began to yaw and slow down a lot by the time it got there. Switching to the 107 gr SMK the bullet was no more accurate out to 700 yards but did much better at 1000 yards since it did not yaw. All things being equal I think the TMK's should be a bit better at 1000 yards but it's only a guess.

My 2 cents is to work up your best loads, find a day without wind and shoot paper at 1000 yards. Then do it a couple more times and you'll have your answer. Unlike the high altitude guys I am at 500 ft above sea level so the air is thick and slows the bullets down much faster than at 5000 feet.

Edit to add.... as LR55 said, the 6.5 Grendel is not really a 1000 yard cartridge. Well.... maybe it is at high altitude in a bolt rifle with a long barrel but the other 99% of the time it's more like an easy to shoot 700 yard cartridge that is fun to run at longer ranges.