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80gr eldm 223

I am beginning to think that my 8 twist shoots the 77 smk's better than the 80 smk's. But it might be because my lands have moved and I need to rework my load
 
rebs said:
I am beginning to think that my 8 twist shoots the 77 smk's better than the 80 smk's. But it might be because my lands have moved and I need to rework my load
Click to expand...
That will make a difference for sure
 
DLT,

They work well in my 8 twist rifles, even better than the SMKs, JLKs, and Berger 80s out to 1k. 24 to 26 inch barrels. N-550 or PP 20MR, work up to 26 grains with WSR or CC1 41s, 2.555 COL.

HTH,
DocBII
 
DLT said:
Will the hornady 80gr eldm stabilize in a 8 twist 223 ? Box says 7 twist
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The box says 7-twist for a reason.

Here's why...maybe you can get them to stabilize in an 8-twist barrel under optimal conditions, but that defeats the whole purpose of going with the higher BC bullet in two ways: 1) a sub-optimal twist rate makedly reduces the effective BC, which is the whole reason for using the longer, heavier, higher BC bullet in the first place; 2) you likely won't be able to run the heavier bullet at the same velocity as a shorter lighter bullet in a given barrel length. So performance takes a hit.

People have reported insufficient stability issues from 8-twist barrel even with the much shorter 75 ELDM, which also states to use a 1:7 twist rate right on the box. Stability issues with the longer 80 ELDM and a 1:8 twist barrel will likely be much worse. Maybe you can get it to remain stable all the way to to the target with an 8-twist, maybe not. It's still not going to be delivering the intrinsic BC you paid for, not even close. You'd be much better off using one of the shorter/lighter ELDMs such as the 73 gr, or even the the 75 gr, although the 75 is not going to be optimal in an 8-twist barrel, either. It's a pretty safe bet that when the bullert manufacturer themselves states to use a certain minimum twist rate, you should probably be using that twist rate.
 
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The 75ELD used to say 1:8 twist on the box. Now they’ve changed it. Maybe because their data lists it at a 2.380 COA length and keeping that below 55,000 psi is difficult to get the velocity to 1.5 stability. I load them and the 80ELD to 2.545 and shoot them between 2970-2950 and get 2-3 inch groups at 700 yards. I’m hoping to get a chance to take them out to 800, 900 and 1000 yards to really test the 8 twist stability. I was going today but with all the rain this week the long range wasn’t available. I’ll report my findings hopefully after next weekend.
 
This thread getting a little old but wanted to point out that elevation plays a much bigger role in stability than velocity… play with some calculators and it ll be real apparent.
 
Tried a straight sub for the 80 MK when supplies where short. No dedicated workup. They were bad enough that I ordered a couple boxes of Berger 80.5s. Shooting a Krieger 8 twt.

Frank
 
William Vogel said:
The 75ELD used to say 1:8 twist on the box. Now they’ve changed it. Maybe because their data lists it at a 2.380 COA length and keeping that below 55,000 psi is difficult to get the velocity to 1.5 stability. I load them and the 80ELD to 2.545 and shoot them between 2970-2950 and get 2-3 inch groups at 700 yards. I’m hoping to get a chance to take them out to 800, 900 and 1000 yards to really test the 8 twist stability. I was going today but with all the rain this week the long range wasn’t available. I’ll report my findings hopefully after next weekend.
Click to expand...

That is plenty velocity for an 8 twist.
 
Bullet makers have learned to increase BC by shortening bearing surface. Bearing surface length is a significant factor in accuracy, but is not a component of stability calculators.
My 6mm 1:8 barrel shoots Berger 105gr very well, but 95gr Hunting VLDs make shotgun patterns. The 95s list a very high BC/weight, but the bearing surface is tiny.
This is why 77SMK will shoot more accurately than 75ELDMs at marginal velocities.
Don't be suckered reaching for BC.
 
ASbobcat said:
Bullet makers have learned to increase BC by shortening bearing surface. Bearing surface length is a significant factor in accuracy, but is not a component of stability calculators.
My 6mm 1:8 barrel shoots Berger 105gr very well, but 95gr Hunting VLDs make shotgun patterns. The 95s list a very high BC/weight, but the bearing surface is tiny.
This is why 77SMK will shoot more accurately than 75ELDMs at marginal velocities.
Don't be suckered reaching for BC.
Click to expand...

That's odd. I've shot those 95 VLDs all the way up to 3400 feet per second in an eight twist and they shot teeny tiny little holes.

Never heard that one before. That that bullet wouldn't shoot in an eight twist.
 
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