Selecting a bullet

[bbogue1]

When I am selecting a cast bullet it seems to me the longerit is the better for accuracy, is that true?

[Mk42gunner]

Like so many other questions, the answer is -- It depends.

Just a few of the factors are: Caliber (bore size), twist rate, cartridge, type of gun, sights, etc..

Robert

[elk hunter]

Not necessarily, too long a bullet with too slow a twist rate can mean poor accuracy even tumbling bullets. Posting what make, model and caliber of firearm when asking about which bullet will get you lots of good information.

[JSnover]

Yep, caliber and twist are the two most important factors. Then comes velocity.

[Yodogsandman]

The really long, skinny boolits have problems with being bent while de-molding or sizing.

[JonB_in_Glencoe]

Welcome to the website bbogue1.

Boolit weight should be matched to barrel twist rate.
also, it is more challenging to perfectly cast long skinny boolits, an imperfect boolit isn't as accurate as a perfect one.

fyi, I moved your thread to a more appropriate forum.

[runfiverun]

accuracy...

[John Boy]

Just a few of the factors are: Caliber (bore size), twist rate, cartridge, type of gun, sights, etc.. Add Ballistics Coefficient!

[wv109323]

Remember that nearly all modern rifles/cartridges are designed to shoot jacketed bullets. Thus the barrel twist rate is determined by the velocity of a jacketed bullet. Most generally a cast boolit can not be shot at the velocity of it's jacketed counterpart. So the cast boolit leaves the barrel with less "spin" or RPMs. This is not as true with handgun calibers.
The RPMs of the boolit are the main part of it being stable in flight. Also the longer the bullet the more RPMs are required to stabilize it. So there is a trade-off between barrel twist rate and bullet length and accuracy.
A longer boolit offers more surface contact with the rifling. That makes it harder for the boolit to "slip the rifling". A fast driven lead bullet may accelerate down the bore and the spin not imparted on the boolit but a longer boolit helps.
Long thin boolits are usually harder to cast because there is so much surface area in contact with the mold. That makes it tougher to get complete fill out of the mold.
That is just some of the fun.

[gwpercle]

Not always , depends on a lot of factors.

[runfiverun]

never mind the twist, it only affects weight choice when it is too slow.
just pick a boolit that fits, that allows you to work around everything else.

if the gun is mechanically wrong [dimensionally challenged] nothing you pick or do to the boolit will make it shoot well.

[Hickory]

There too many variables to nail down one or two different bullets that will give the performance that you seek.
Bullets, powder, primers and cases are all manufactured in lots. Anytime you change even one component, you should rework the load to regain what you had before. Even your gun is a variable, if someone has a load that shoots very good in their firearm it may not shoot the same in yours.
Even cast boolits can change in as far as alloy and hardness from (Your own) lot to lot, will or may change the way your load shoots. This is one of the things about casting, load development and shooting, there are always variables in what you do.

[robg]

The most consistently accurate boolits is what matters ,test them first.

[OS OK]

SNIPER 101 Part 4 - Bullet Dynamics - Rex Reviews (https://www.youtube.com/watch?v=RCu8a5MynwM)

For a good general understanding of all the dynamics, this is an outstanding site...there's a couple other vids he does regarding this. Look at his Y-Tube site under the Sniper 101 Series, almost a 100 videos there.

Once you get these concepts down just remember this is J-Types...casts are a different critter but the same factors affect them. Can't hurt to look.