90gr from 1/8 223
- Thread starter kzin
- Start date
kzin,
Depending on the ALTITUDES you will be shooting at. The 80gr VLD, 80.5 FULLBORE or 82gr LRBT bullet may work. http://www.bergerbullets.com/twist-rate-calculator/ . Try it and let me know what Stability Factor (SG) you get and what yardage you will be shooting out too and we can go from there.
Thanks but I'm not really at the serious load development stage. Posts 3 and 4 were about what I was looking for now.
I need to rearrange my home and make a reloading area first
Yes you can brother. I do it no with a 1/7 twist 30" 4 groove shooting 2760 accurately.
Yeah, but just out of curiosity how bad is "'won't work"?
Can't hit the 10?
the black?
the backer?
Shot a good group at 200 yards
Tested @ 600 on paper all over the Target ..last round of 10 hit the up right on target carrier
2700 FPS out of 28 “ barrel
Sierra 80s work good
Interesting you say they were good at 200.
One of the things I was thinking about is using them for reduced course 200yd when the wind is nasty.
Hey That would work
I was trying to work up a load for my Son at 600 for FTR
Best of Shooting for You
Ned Ludd
Silver $$ Contributor
The answer to your question largely depends on the specific bullet you're talking about, the exact OAL of the specific Lot you have, and the velocity you can actually achieve. According to Berger's Twist Rate Calculator using atmospherics appropriate to my location (75 degrees, 1000 ft elevation), the Berger 90 VLD at 2850 fps would have an Sg of 1.13. That's getting pretty close to "keyholing" territory. However, for the [much] shorter (OAL of ~1.250" vs ~1.170") Sierra 90 gr bullet, the predicted Sg is 1.37, which although you'd be giving up a fair bit of the intrinsic BC of the bullet, should make it to the target just fine. The bottom line is that even with the Sierra 90 gr bullet, you'd still be running close to the margin with an 8-twist barrel, such that even very minor length and velocity variances could make a difference. Hornady has a new 88 gr .224 bullet (ELD-M), but the OAL with the plastic tip (~1.242") is almost as long as a 90 VLD, so I don't think you'd be much better off there, either.
If you're not willing to install a 7-twist barrel, you only real option is to shoot one of the 80-grain offerings that are appropriate with an 8-twist barrel, and accept the fact that the BCs simply aren't going to be as high as with the 90s. Berger's 80.5 Fullbore is an outstanding bullet and will work well in an 8-twist, you might give it a try.
If you're not willing to install a 7-twist barrel, you only real option is to shoot one of the 80-grain offerings that are appropriate with an 8-twist barrel, and accept the fact that the BCs simply aren't going to be as high as with the 90s. Berger's 80.5 Fullbore is an outstanding bullet and will work well in an 8-twist, you might give it a try.
XTR
F-TR obssessed shooting junkie
Have you looked at the drift difference between say a 90VLD vs most of the 80s at 200 with achievable velocities? In full value 10MPH wind you are talking about a bullet diameter of drift difference, which is probably less than your ability to hold or your platforms precision capability. On a 3 MPH shift that you completely miss that's in the range of 0.1 inches on the target, and that doesn't take in to accouint the loss of BC on with the 90s due to lack of stability. You won't be able to tell the difference, or if you do it will not be in favor of the 90s, and you'll need to have the rifle set up to shoot 90s, which makes it limited with lighter bullets.. Stick with the 80s esp. if you are shooting reduced courses.
Wut?
I'm seeing about 1.3 inches difference at full value 10mph between 77s and 90s at 200 on the online calculator. Are 80s that much closer to 90s than 77s? Don't have time right now to look up 80s specs and punch them in.
I have a 1/7 30" savage ftr that should shoot 90s fine. I was just wondering how bad it would be to run some through my 26" 1/8 AR or even my 20" 1/8 AR. I currently shoot FGM 77s most of the time out of all 3.
Long term I think I want a 1/6.5 20" 224 Valkyrie AR for 90s but from what I'm hearing I'm not in a rush to go there yet.
Jdne5b
Gold $$ Contributor
Thats for a 10mph full value. XTR is talking about a switch.
Run the 77 at 10mph and 7mph. Whats the change?
Run the 90 at 10mph and 7mph. Whats the change?
Now what is the difference between the two?
Thats the number that really matters, and is what Wade is getting at.
Run the 77 at 10mph and 7mph. Whats the change?
Run the 90 at 10mph and 7mph. Whats the change?
Now what is the difference between the two?
Thats the number that really matters, and is what Wade is getting at.
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