Can you seat a 180 Berger VLD in a 7mm-08 case to about ~2.840"-2.860" and the ogive not go below the case neck? I was curious if this would work feeding from an AI mag and the bullet be out far enough to touch the lands and still feed from a mag?
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Re: 7mm-08 with 180 VLD- doable?
You can figure this out mathematically:
length of bullet below neck/shoulder = bullet length - neck length - (COAL - case length)
= 1.525 - 0.284 - (2.860 - 2.035)
= 0.416
Numbers taken from Lyman 49th and Bryan Litz's book.
You can figure this out mathematically:
length of bullet below neck/shoulder = bullet length - neck length - (COAL - case length)
= 1.525 - 0.284 - (2.860 - 2.035)
= 0.416
Numbers taken from Lyman 49th and Bryan Litz's book.
Re: 7mm-08 with 180 VLD- doable?
Chad,I wanted to add an additional question. What velocities would one expect out of a 27" barrel?
Steve
Chad,I wanted to add an additional question. What velocities would one expect out of a 27" barrel?
Steve
Re: 7mm-08 with 180 VLD- doable?
Sorry, you said ogive above neck...
Ogive starts at 0.734 above the base of the bullet. So:
0.734 - 0.416 - 0.284 = 0.034
It's positive, so it's still above the case mouth.
Sorry, you said ogive above neck...
Ogive starts at 0.734 above the base of the bullet. So:
0.734 - 0.416 - 0.284 = 0.034
It's positive, so it's still above the case mouth.
Re: 7mm-08 with 180 VLD- doable?
Nice- Thanks, K! If you trim to minimum length, then you'll be .044" above ogive. There's not a lot of room to chase the lands though. That's pretty close. At 2.860", I'm at mag length with the metal front plate still in the mag. Thanks!
Chad
Nice- Thanks, K! If you trim to minimum length, then you'll be .044" above ogive. There's not a lot of room to chase the lands though. That's pretty close. At 2.860", I'm at mag length with the metal front plate still in the mag. Thanks!
Chad
Re: 7mm-08 with 180 VLD- doable?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: steve123</div><div class="ubbcode-body">Chad,I wanted to add an additional question. What velocities would one expect out of a 27" barrel?</div></div>
Should be around 2600-2650.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: steve123</div><div class="ubbcode-body">Chad,I wanted to add an additional question. What velocities would one expect out of a 27" barrel?</div></div>
Should be around 2600-2650.
Re: 7mm-08 with 180 VLD- doable?
I see the appeal of it, the BC is listed as 0.659 in Bryan's book. It is the highest BC 7mm bullet listed.
Although, the 175 SMK is listed at 0.639. It will probably be very close in ballistics and will be far more tolerant of jump. Its only 1.453" long, so you will also gain some case capacity and the ogive will be farther out.
I highly recommend getting Bryan's book if you haven't already. It lets you compare the ballistics of different cartridges with different bullets apples-to-apples with BCs that were derived in the same way.
Here's a nice example:
6.5-284 139 Lapua Scenar (BC=0.557) 2970 fps muzzle
1000 yards: -274" drop, 70" wind (10 MPH)
260 Rem. 140 JLK (BC = 0.639) 2820 fps. muzzle
1000 yards: -286" drop, 64" wind (10 MPH)
Your 7mm VLD with 2600 fps muzzle
1000 yards: -341" drop, 70" wind (10 MPH)
All three are the same as far as wind drift goes. The 260 and the 6.5-284 are equal in practical terms (in this case). This is why there is more to long range ballistics than just caliber and barrel length. A simple bullet choice can obliterate any advantage the "better" caliber/setup is perceived to have.
Really, Bryan's book is a Godsend for doing this type of analysis. And I have verified enough of his BC's myself to be confident in his work.
I see the appeal of it, the BC is listed as 0.659 in Bryan's book. It is the highest BC 7mm bullet listed.
Although, the 175 SMK is listed at 0.639. It will probably be very close in ballistics and will be far more tolerant of jump. Its only 1.453" long, so you will also gain some case capacity and the ogive will be farther out.
I highly recommend getting Bryan's book if you haven't already. It lets you compare the ballistics of different cartridges with different bullets apples-to-apples with BCs that were derived in the same way.
Here's a nice example:
6.5-284 139 Lapua Scenar (BC=0.557) 2970 fps muzzle
1000 yards: -274" drop, 70" wind (10 MPH)
260 Rem. 140 JLK (BC = 0.639) 2820 fps. muzzle
1000 yards: -286" drop, 64" wind (10 MPH)
Your 7mm VLD with 2600 fps muzzle
1000 yards: -341" drop, 70" wind (10 MPH)
All three are the same as far as wind drift goes. The 260 and the 6.5-284 are equal in practical terms (in this case). This is why there is more to long range ballistics than just caliber and barrel length. A simple bullet choice can obliterate any advantage the "better" caliber/setup is perceived to have.
Really, Bryan's book is a Godsend for doing this type of analysis. And I have verified enough of his BC's myself to be confident in his work.
Re: 7mm-08 with 180 VLD- doable?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kombayotch</div><div class="ubbcode-body">
Here's a nice example:
6.5-284 139 Lapua Scenar (BC=0.557) 2970 fps muzzle
1000 yards: -274" drop, 70" wind (10 MPH)
260 Rem. 140 JLK (BC = 0.639) 2820 fps. muzzle
1000 yards: -286" drop, 64" wind (10 MPH)
Your 7mm VLD with 2600 fps muzzle
1000 yards: -341" drop, 70" wind (10 MPH)
</div></div>
How much better would it be if it were a straight .280/7mm-06?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kombayotch</div><div class="ubbcode-body">
Here's a nice example:
6.5-284 139 Lapua Scenar (BC=0.557) 2970 fps muzzle
1000 yards: -274" drop, 70" wind (10 MPH)
260 Rem. 140 JLK (BC = 0.639) 2820 fps. muzzle
1000 yards: -286" drop, 64" wind (10 MPH)
Your 7mm VLD with 2600 fps muzzle
1000 yards: -341" drop, 70" wind (10 MPH)
</div></div>
How much better would it be if it were a straight .280/7mm-06?
Re: 7mm-08 with 180 VLD- doable?
7mm VLD with 2800 fps muzzle
1000 yards: -287" drop, 62" wind (10 MPH)
7mm VLD with 2800 fps muzzle
1000 yards: -287" drop, 62" wind (10 MPH)
Re: 7mm-08 with 180 VLD- doable?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kombayotch</div><div class="ubbcode-body">7mm VLD with 2800 fps muzzle
1000 yards: -287" drop, 62" wind (10 MPH) </div></div>
That's pretty bitchin... 27" barrel? Or?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: kombayotch</div><div class="ubbcode-body">7mm VLD with 2800 fps muzzle
1000 yards: -287" drop, 62" wind (10 MPH) </div></div>
That's pretty bitchin... 27" barrel? Or?
Re: 7mm-08 with 180 VLD- doable?
I've been really enjoying Brians book since getting it last week.
Carry on.
I've been really enjoying Brians book since getting it last week.
Carry on.
Re: 7mm-08 with 180 VLD- doable?
The velocity was just a QL approximation with the 180 VLD bullet and whatever defaults it gave for 280 Rem. Wasn't the highest velocity generated, about 50 fps less.
The velocity was just a QL approximation with the 180 VLD bullet and whatever defaults it gave for 280 Rem. Wasn't the highest velocity generated, about 50 fps less.
Re: 7mm-08 with 180 VLD- doable?
I'm thinking about building either a 7-08 or 7-06 since I have a lot fo .308 and 30-06 brass.
I'm thinking about building either a 7-08 or 7-06 since I have a lot fo .308 and 30-06 brass.
Re: 7mm-08 with 180 VLD- doable?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Buzzsaw</div><div class="ubbcode-body">Chad, what's got byou building a 7mm-08. I love the cartridge. </div></div>
Hey Buzz,
Nothing really. I like the round also, and was curious if the 180 VLD would fit in it. I know it's a long bullet. With it's high BC, if you could push it fast enough and seat it on the lands, I think it would be a good long range round.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Buzzsaw</div><div class="ubbcode-body">Chad, what's got byou building a 7mm-08. I love the cartridge. </div></div>
Hey Buzz,
Nothing really. I like the round also, and was curious if the 180 VLD would fit in it. I know it's a long bullet. With it's high BC, if you could push it fast enough and seat it on the lands, I think it would be a good long range round.
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