I think 200 fps doesn't represent well what some of us are looking at. Some of the bigger case driving bullets several hundred fps are beginning to be realistic. Using the generic Nosler data in .338 RUM, The 180 Accubond at 3535 fps (BC 0.372) vs the 300 grain version at 2643 fps for example (BC 0.72) Using generally 1800 fps as a threshold for good expansion gets both to 700 yards, before the 300 starts its run to the 100 yard line. The 300 is at 1554 fps while the 180 is at 1314. Drop favors the 180 all along the way-256" against 319" at a 1000. Drift goes to the 300 in a 10 mph wind 61" to 99" at a 1000......Try this same exercise with the lower bc bullet being 20g lighter thus running 200 fps faster. This would be a good comparison of two bullets with similar form factor but the lighter one having less bc because of the weight. This sets up the rabbit and turtle race. Turtle always wins but in many cases he doesn't pass the rabbit until further down range than is needed..........
Sub MOA is another factor if the wheels fall off because we're driving it too hard that's not good either. Choice in the end is made up of assembling all the parameters.All these things need to be balanced ideally IMO......but we are all in different situation....... I'm not worried about getting into a shoulder or missing because were going sub inch in range it might be an issue........
Pretty sure it’s more to do with recoil, hence the increasingly smaller bores. From a 24 inch barrel I bet a Berger 200.20x could be pushed fast enough from a 308 to beat 6.5 CM. However, I KNOW which would recoil more and on the clock that matters.Picky, picky, picky!
Guys, I was comparing two SIMILAR cartridges with two bullets of very different BCs. (i.e. nearly similar bullet weights and similar design)
Yes, I know we're talking bullets and not cartridges. Just using two well known cartridge examples. And we know most competitive PRS shooters no longer use .308 Win cartridges for this reason.
Nice. Nothing to original about shooting techniques these days, lolTodd stole that method for his own by the way. It was first presented to the Army school house in the late 90's by Dan Flowers. I learned it from Dan in 1999. Since ballistic programs weren't yet readily available to individuals, Dan worked it out using Excel spreadsheets.
Todd learned it in about 2005 or later, and took it for his own. He then monetized it by developing the Tremor reticles around it, and selling it back to the Army he stole it from.
Agreed, it cant be just about BC's, but about how the bullet will perform on game. Especially when shots at close range come in to play.I see where issues like fighting the wind come into the discussion of BC and its relative importance, as discussed above. But my own consideration of BC is a little different, when considering hunting bullets and their effectiveness at a given distance.
Personally, I begin my thinking with terminal effects. There seems to be an assumption throughout this entire discussion that all bullets under consideration have equal terminal effects, so the focus is only on external ballistics (how the bullet travels from the gun to the target).
I want to know the effective velocity range for the bullets I'm considering, which means I'm concerned about velocity. BC comes into the equation because it tells me what velocity I can expect at a given distance. I know that dialing for drop is relatively easy, as has been mentioned, but it's not the drop I'm focused on. It's the velocity. The velocity at distance (the result of BC) tells me my effective range in order to achieve the terminal effects on target that I'm looking for.
Also, I agree with the notion expressed above that in comparing different bullets, you should focus on like bullets from a terminal perspective. Said another way, you should compare the actual options you would use. For example, I wouldn't compare a 180 gr lead core bullet to a 180 gr monolithic, because I wouldn't choose between those two. The monolithic will penetrate better and have similar terminal effects when using 160 or 150 grains, so that's the bullet I'd compare to the 180 gr lead bullet.
Yes, I opened the terminal effects bucket of worms. My intent is not to derail this discussion, but only to explain how I (and maybe others) incorporate BC into my thinking when considering hunting bullets and their effective range.
I get what your saying Rian, but ask yourself am I really good enough to shoot a 1,000 and hold 51" or 56" that's with a steady wind and most 1,000 hunting situations are like that. So if its 10 mph were I'm at is it gonna be 10 all the way there or 5 at the target. I'll bet money if the vast majority of use including me couldn't hit a 8" steel gong 25% of the time in the situation I described.I look at it as why add another 5 inches to an already poor wind call, I'll take 5 free inches of help on windage every time!!
It's often for me not what I'm currently capable of but what I'm working towards, kinda the same argument with things like spin drift and Coriolis many use, ya for some time we all will loose it in the noise but if your going to work your precision down tighter every year you will never get below the size of the noise you haven't cleared out, I attack it from the perspective of clearing out as much noise and tighten up everything possible right out of the gate so I have the fewest things that can be a possibility for a missed call.I get what your saying Rian, but ask yourself am I really good enough to shoot a 1,000 and hold 51" or 56" that's with a steady wind and most 1,000 hunting situations are like that. So if its 10 mph were I'm at is it gonna be 10 all the way there or 5 at the target. I'll bet money if the vast majority of use including me couldn't hit a 8" steel gong 25% of the time in the situation I described.
I'm being totally honest with myself.
But that isn't strictly a BC comparison. If you run them at the same velocity you'll prove how the higher BC bullet has the advantage throughout the flight path.my comparison was same cartridge, apples to applesyours is completely different cartridge apples to oranges.
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