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- Thread starter BigBraz15
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Hunting and sporting arms, next rifle cartridge for youngster. It’s all fair game. Did you add helpful stuff to thread? Or was your deck so full you didn’t know where to start?
You engaged me and now don’t wanna play? I had a feeling...
https://www.canadiangunnutz.com/for...meter-vs-sectional-density-vs-energy.2332840/
Post #5!
You bandy around the concept of Section Density like it’s something magical, it isn’t, it’s a comparison of diameter to weight, and it means jack squat, when differing bullet designs come into it. Penetration will trump SD all day long, when on game performance is a must. A high SD with a frangible bullet is pretty much useless for big game hunting, while a lower SD bullet that is designed to expand as well as penetrate is a better choice for big game. That’s why a 110 grain Mono will out penetrate, retain more weight and usually give a larger expanded bullet than a 130 grain Partition, even when the impact energies are nearly identical. (270 Win)
SD is just a number, that means next to nothing when the bullet hits the animal.
Means a lot in bullets with high variable sd characteristics, better start with enough. Or your .243 55gr vmax might not get as far as you’d like on your moose. Means a lot less in bullets with low variable sd like a 55gr mono or bonded.
But when you can choose between two same weight bullets at opposite ends of sd variability and know that both have enough sd to penetrate the moose front half from any angle then are you choosing the one that dumps all its work over 18” or the one that dumps all its work over 36”?
You wanna drop 100 ft/lbs per inch over bulk of swim travel or 50 ft/lbs per inch over same distance while the hillside eats the rest? You wanna walk right up to your game or trail em for awhile with finners crossed?
Do both work? Sure. Choose whatever you want for goals intended. But if you don’t understand sd or the variability of it as it relates to penetration for game class intended then it’s pretty easy to get the formula wrong.
Once you understand the formula it’s easy to look at any bullet and know by simple numbers if that’s adequate for goals intended and if it’s gonna do the work you want.
You can go look at any bullet proven to work for a game class intended and see by as numbers and construction alone to see what you’re up against with any headstamp behind it.
Don’t forget all the benefits that generally come with higher sd bullets being that higher bc and what it does for hit probability on the air swimming side of the equation.
There are levels in terminal performance. Choose your level. Study the game. The formulas show themselves.
You still didn’t say what what you recommend, how you choose, or why? Can’t wait to hear what a full deck will teach me.
Haha Kodiak knows, just went read post 5 in that link.
He said what I’m saying, just differently.
If sd didn’t mean anything of value then why isn’t anyone using 50gr vmax for big game? Want the easy button? Go look up sd’s of 77/88 gr .22, 105-112 6mm, and all the other proven killers of big game in the rapid expansion bullet world and you’ll see a pattern. .25 or higher is pretty hard to fack up regardless of construction. But you wanna run somewhere down in the varmint sd range you’re gonna need a bullet that keeps as much weight as possible to make it as far as you need.
It’s like a go no go gauge for match bullets and big game. Deer size game use .2 rule of thumb. But if you want to include elk and moose then use the .25 rule of thumb. Or you’re gonna find marginal results with .2 range sd rapid expansion bullets when moving to elk and moose. It’s age old and easy to understand why the heavier bullets always got recommended for the bigger classes of game on all the old cartridges, deer bullets vs moose bullets lol. 150’s vs 180’s, 80’s vs 100’s, 130’s vs 150’s....it’s been a fact since we started shooting animals lol.
Understand it however you like. But it matters, a lot lol.
He said what I’m saying, just differently.
If sd didn’t mean anything of value then why isn’t anyone using 50gr vmax for big game? Want the easy button? Go look up sd’s of 77/88 gr .22, 105-112 6mm, and all the other proven killers of big game in the rapid expansion bullet world and you’ll see a pattern. .25 or higher is pretty hard to fack up regardless of construction. But you wanna run somewhere down in the varmint sd range you’re gonna need a bullet that keeps as much weight as possible to make it as far as you need.
It’s like a go no go gauge for match bullets and big game. Deer size game use .2 rule of thumb. But if you want to include elk and moose then use the .25 rule of thumb. Or you’re gonna find marginal results with .2 range sd rapid expansion bullets when moving to elk and moose. It’s age old and easy to understand why the heavier bullets always got recommended for the bigger classes of game on all the old cartridges, deer bullets vs moose bullets lol. 150’s vs 180’s, 80’s vs 100’s, 130’s vs 150’s....it’s been a fact since we started shooting animals lol.
Understand it however you like. But it matters, a lot lol.
SD is not variable, it’s a mathematical relationship between weight and diameter.
Bullet construction trumps sectional density, but you are so confused about that you talk jibberish.
Just stick a cork in it as you know not what you speak.
As for my recommendation, you didn’t look very closely did you………
Try post 12!
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