Rem 700 with 20 inch BBL, FGMM 168, on-target at 900, goes transonic and tumbles at 1000.
The coefficient will fall off as the bullet slows down. That's what screws up the calculators.
The calculators are helpful for getting an idea of what will happen down range.
Barrel length really doesn't matter, it's all about muzzle velocity. That can vary in two different barrels of the same length with the same load and the same temps. A chronograph is a worthy investment if you don't have one.
Still gonna recommend moving to a 175gr~ bullet. The Hornady 178gr bthp match would put you at an (advertised) BC of .530. That's gonna make a big difference down range and help keep you out of the transonic range, and keep you a little bit flatter once you get in the tough region past 800 yards or so.
For all the work you put in getting good ballistic info, you really want to start with the best bullet for the job so you don't have to start over again later.
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Cool. Glad you are doing your homework. It's just that when folks ask a questions such as these they often have little understanding on what it takes to get reliable hits at 1,000 yds and beyond. It helps to preface your statement. They think they can dial in say 30 MOA into a deer hunting quality scope and expect it to reliably track all the way across its range. Then they wonder why they can't get hits or they shoot something they don't intend. You need to work your way out in hundred yard increments and not just go for it at 1k. If you work your way out you realize wind, temp, barometric pressure and a host of other things all play a part. Sorry for riding you hard. But I have seen careless folks that were new to long rang shooting tear up some stuff trying to get on target by either shooting short and skipping rounds or flat out missing.
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Get 175/ 178gr bullets and don't look back.I will pick up some of those 178 grain hornady and re-zero at 100. If that extra weight at further distances helps the bullet from tumbling and going trans sonic then I will definitely take your advice. The heavier bullet will also help with wind not affecting as much too, right?
Get a ballistic app (my free Strelok works well) and play with the numbers.Just a quick general question for those who shoot a 308cal to 1000 or greater yards. And please give me barrel length and bullet info. How many MOA does it take for you to be on target at 1000+? and what scope base moa are you using?
Get a ballistic app (my free Strelok works well) and play with the numbers.
Once dialed in it is very accurate.
The Hornady 178gr bthp match would put you at an (advertised) BC of .530. That's gonna make a big difference down range and help keep you out of the transonic range, and keep you a little bit flatter once you get in the tough region past 800 yards or so.
This. It's an awesome bullet for long range.