Looking at Hornadys info on the 140gr Amax bullets, on the bottom of the label it indicates 1-7.5 twist rate required. Anyone know what going on. I looked at their website and didn't see anything about that requirement.
Range Report Hornady 140gr Amax Twist Rate
- Thread starter majohnson2
- Start date
Re: Hornady 140gr Amax Twist Rate
Rob
Have you tried any other 140gr bullets? I shot 2 boxes of the Amax 140, after reloading the cases w the factory load but using Bergers VLD 140gr. While the While accuracy of the factory loads was good the Bergers made a noticable improvement. I did a load ladder increasing in .3gr, the 1st 7 went into a sub quater size hole. Another shooter was doing the same load work on a 338LM. While he had a spread, he mentioned I retry at a longer yardage. The wind in creased so anything else would have been questionable. I wonder why Hornady would spend the time & effort of printing that on a label.
Rob
Have you tried any other 140gr bullets? I shot 2 boxes of the Amax 140, after reloading the cases w the factory load but using Bergers VLD 140gr. While the While accuracy of the factory loads was good the Bergers made a noticable improvement. I did a load ladder increasing in .3gr, the 1st 7 went into a sub quater size hole. Another shooter was doing the same load work on a 338LM. While he had a spread, he mentioned I retry at a longer yardage. The wind in creased so anything else would have been questionable. I wonder why Hornady would spend the time & effort of printing that on a label.
Re: Hornady 140gr Amax Twist Rate
I know no one.... i.e. NOT ONE PERSON who shoots a 1:7.5 6.5mm barrel. Never even heard of one.
I'm not Rob, but I have shot 139 Lapuas, 140 Bergers, 140 Berger Hybrid, 140 Amax's and Hornady 140 BTHP's. They all shoot relatively the same in my rifle. 1/4 to 1/3 moa out to 750 yards. If yours shoots one a lot better that the other, it's either a distance to the lands issue (common with secant ogive bullets) or a throat length/leade angle issue (dependant on reamer design).
John
I know no one.... i.e. NOT ONE PERSON who shoots a 1:7.5 6.5mm barrel. Never even heard of one.
I'm not Rob, but I have shot 139 Lapuas, 140 Bergers, 140 Berger Hybrid, 140 Amax's and Hornady 140 BTHP's. They all shoot relatively the same in my rifle. 1/4 to 1/3 moa out to 750 yards. If yours shoots one a lot better that the other, it's either a distance to the lands issue (common with secant ogive bullets) or a throat length/leade angle issue (dependant on reamer design).
John
Re: Hornady 140gr Amax Twist Rate
I'm trying to understand why Hornady would indicate that twist rate on the 100 count Amax bullet box label. Curious, I looked and 1-7.5 barrels are available, Brunos has Kreiger barrels in stock at that twist rate.
I'm trying to understand why Hornady would indicate that twist rate on the 100 count Amax bullet box label. Curious, I looked and 1-7.5 barrels are available, Brunos has Kreiger barrels in stock at that twist rate.
Re: Hornady 140gr Amax Twist Rate
i shoot 140 amaxs exclusively in my creed with an 1/8 twist. its an absolute hammer. i don't know why hornady or any other manufacturer does the shit they do sometimes. why put the load on the box as 41.5 when everyone i've ever torn down was 42.6-7....i know they load to pressures etc....just sayin
i don't really give a shit i guess so long as i'm getting the results i am.
whatever
i shoot 140 amaxs exclusively in my creed with an 1/8 twist. its an absolute hammer. i don't know why hornady or any other manufacturer does the shit they do sometimes. why put the load on the box as 41.5 when everyone i've ever torn down was 42.6-7....i know they load to pressures etc....just sayin
i don't really give a shit i guess so long as i'm getting the results i am.
whatever
Re: Hornady 140gr Amax Twist Rate
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: majohnson</div><div class="ubbcode-body">I trying to understand why Hornady would indicate that twist rate on the 100 count Amax bullet box label. Curious, I looked and 1-7.5 barrels are available, Brunos has Kreiger barrels in stock at that twist rate. </div></div>
There's a lot of reasoning behind this simple answer, but here it is:
C.Y.A.
They are printing it for margin of safety. The 140 Amax is always going to be stable at rifle speeds from any caliber with a 7.5tw in any atmospheric conditions.
My experience with the bullet says that it's the same for an 8tw + 140 Amax combo. I've shot and seen a lot shot from 8.5tw and they work until the DA's drop below ~ -1400, which is for most of January around me. An 8.75tw will stabilize the 140Amax in DA's over 1000-1200' from a 260 Rem but after that they get unreliable. The 140BTHP Hornady though is 0.04" shorter overall and works from it.
If you have an 8 or 8.5tw rifle barrel you'll be just fine with them anywhere in CONUS.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: majohnson</div><div class="ubbcode-body">I trying to understand why Hornady would indicate that twist rate on the 100 count Amax bullet box label. Curious, I looked and 1-7.5 barrels are available, Brunos has Kreiger barrels in stock at that twist rate. </div></div>
There's a lot of reasoning behind this simple answer, but here it is:
C.Y.A.
They are printing it for margin of safety. The 140 Amax is always going to be stable at rifle speeds from any caliber with a 7.5tw in any atmospheric conditions.
My experience with the bullet says that it's the same for an 8tw + 140 Amax combo. I've shot and seen a lot shot from 8.5tw and they work until the DA's drop below ~ -1400, which is for most of January around me. An 8.75tw will stabilize the 140Amax in DA's over 1000-1200' from a 260 Rem but after that they get unreliable. The 140BTHP Hornady though is 0.04" shorter overall and works from it.
If you have an 8 or 8.5tw rifle barrel you'll be just fine with them anywhere in CONUS.
Re: Hornady 140gr Amax Twist Rate
6.5mm 140gr A-Max @ 2700fps, from an 8 twist barrel, at sea level elevation and 0°F as a stability factor of 1.49.
6.5mm 140gr A-Max @ 2700fps, from an 8 twist barrel, at sea level elevation and 0°F as a stability factor of 1.49.
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