75gr Hornady BTHP in 223. Correction

[wcf3030]

I buy to much stuff
I wanted the A-MAX and ended up with the Hornady.


I've pick up a box of these and will be testing them in my 223 Ultra.
Any body try this  bullet yet?
Thoughts, opinions, predictions.

[quickdtoo]

Prediction from past reputation....

Even the 1:9" twist barrels have a poor reputation for shooting anything over 60gr well, there have been a few that got fair accuracy with some 68gr bullets in the 1:9" barrels, but best accuracy in all 223 barrels is with 40gr to 60gr bulets.

Good luck!

Tim

[myarmor]

I look forward to hearing how these shoot for you and your load data.
What powder/powders are you using to start out with? What cases?

-Aaron

[handirifle]

That is the long range bullet suggested to me for my savage with a 1-9 twist, but never got around to trying them.

[wcf3030]

I've several thousand used 223 brass, but for this ocassion I'll use new resized and trimmed brass with all the usual prep work done.
I'm starting with Varget but I may try RE-7 and IMR 30-31.

[wcf3030]

That is the long range bullet suggested to me for my savage with a 1-9 twist, but never got around to trying them.

From the reading I've been doing, it should work in my 1-9 twist ultra, but you never know.
I was encouraged by the groups I had gotten at 360yds with 55gr fmj last winter.
So I took a chance and went with the bigger bullet.

[poncaguy]

They shoot great.........in my AR16 1:7 twist...

[Fred M]

 Quote  They shoot great.........in my AR16 1:7 twist... Yah

The the 75gr V-max BT is 1.070 long a full case of Varget wil get you 3064ft at 62.5kpsi in a 223.

My stability calculation indicates a 0.75 SF ( Stability Factor). In order for a bullets to be stable a 1.3 SF is needed. A 1-9" twist is too slow.

[digger658]

Been there, done that with the 75 V-Max!

Smallest group I could get with my Savage 12 at 100 yds. using many combinations of powder and primers was 1" groups.

60 V-Max hold a lot tighter.

[wcf3030]

Quote  They shoot great.........in my AR16 1:7 twist... Yah

The the 75gr V-max BT is 1.070 long a full case of Varget wil get you 3064ft at 62.5kpsi in a 223.

My stability calculation indicates a 0.75 SF ( Stability Factor). In order for a bullets to be stable a 1.3 SF is needed. A 1-9" twist is too slow.

Fred,
Not that I doubt you statement but were did you get your info from?
A software download?

[Fred M]

wcf3030
My stability calculations are developed on a Exel spread sheet from various well known stability formulas, my spread sheet is not for public use since it can be
used in eronious manner.

The results may not be 100% perfect, since some input such as metplat, center of pressure and center of gravity were omitted.

You can also use the Greenhill formula and come up with usable results by substituding the 150 constant to 180 or a bit more. The 150 constant
over-stabilizes the bullets.

Quick Load data is well known, the program is available fro NECO for $154. Its predictions are very close when all the proper values are entered.

Been there done that is no substitude for intellligent stability assessment without all pertinent physical input.

[wcf3030]

wcf3030
My stability calculations are developed on a Exel spread sheet from various well known stability formulas, my spread sheet is not for public use since it can be
used in eronious manner.

The results may not be 100% perfect, since some input such as metplat, center of pressure and center of gravity were omitted.

You can also use the Greenhill formula and come up with usable results by substituding the 150 constant to 180 or a bit more. The 150 constant
over-stabilizes the bullets.

Quick Load data is well known, the program is available fro NECO for $154. Its predictions are very close when all the proper values are entered.

Been there done that is no substitude for intellligent stability assessment without all pertinent physical input.

Thanks. Now I know why I paid attention in Algebra.

Well hopefully tomorrow I'll know.