Range Report JLKs 130 grians
- Thread starter dar1246
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Re: JLKs 130 grians
Swampworks states that the 130 gr. JLK has a BC of .620. The Lapua scenar 139 has a published BC of .615. The 130 should have higher velocities out of the same gun when loaded to the same pressures so it should have a slight advantage in flight as far as wind drift and drop goes. However, Swampworks notates "??" after the published BC for the 130 on their website. I could not find any explanation for the "??" so I'm thinking that the published BC is an estimate on their part.
I can only guess that the differences would probably be so small that it would come down to which bullet is more accurate in your rifle and the cost and availability of the bullets.
Swampworks states that the 130 gr. JLK has a BC of .620. The Lapua scenar 139 has a published BC of .615. The 130 should have higher velocities out of the same gun when loaded to the same pressures so it should have a slight advantage in flight as far as wind drift and drop goes. However, Swampworks notates "??" after the published BC for the 130 on their website. I could not find any explanation for the "??" so I'm thinking that the published BC is an estimate on their part.
I can only guess that the differences would probably be so small that it would come down to which bullet is more accurate in your rifle and the cost and availability of the bullets.
Re: JLKs 130 grians
I shoot a lot of JLK's in .223 and .308. In my experience they don't like to jump, and they love speed. Don't get hung up on BC: compare, using your ballistics program, two bullets at the same velocity, one with a BC of .615 and the other .620. Not much difference, right? As was said above, the advantage of the lighter bullet with roughly the same BC is that you can push it faster. And that's where you gain, big-time. Seat JLK's to the lands and start them there. In good barrels the JLK's I have tried are better than Scenars, meaning that they take less wind and score better on target when shot at the same velocity.
I shoot a lot of JLK's in .223 and .308. In my experience they don't like to jump, and they love speed. Don't get hung up on BC: compare, using your ballistics program, two bullets at the same velocity, one with a BC of .615 and the other .620. Not much difference, right? As was said above, the advantage of the lighter bullet with roughly the same BC is that you can push it faster. And that's where you gain, big-time. Seat JLK's to the lands and start them there. In good barrels the JLK's I have tried are better than Scenars, meaning that they take less wind and score better on target when shot at the same velocity.
Re: JLKs 130 grians
You can compare the ballistics in JBM using the Litz models.
The Scenar has almost the lowest BC of all the 139-142 gr. 6.5mm options when these are derived the same way.
130 Berger VLD 0.552
140 JLK 0.639
140 Berger VLD 0.612
140 Berger LR BT 0.592
142 SMK 0.588
140 AMAX 0.584
140 Berger BT 0.559
139 Scenar 0.557
140 Nosler 0.550
A 260 shooting the 140 JLK @ 2850 fps. has the same drop as a 6.5-284 shooting the 139 Scenar @ 2950 fps., and actually beats it in wind drift.
You can compare the ballistics in JBM using the Litz models.
The Scenar has almost the lowest BC of all the 139-142 gr. 6.5mm options when these are derived the same way.
130 Berger VLD 0.552
140 JLK 0.639
140 Berger VLD 0.612
140 Berger LR BT 0.592
142 SMK 0.588
140 AMAX 0.584
140 Berger BT 0.559
139 Scenar 0.557
140 Nosler 0.550
A 260 shooting the 140 JLK @ 2850 fps. has the same drop as a 6.5-284 shooting the 139 Scenar @ 2950 fps., and actually beats it in wind drift.
Re: JLKs 130 grians
Oh sorry, you want the JLK 130... no data for that. But, I would think it would be slightly higher than the 130 Berger.
Oh sorry, you want the JLK 130... no data for that. But, I would think it would be slightly higher than the 130 Berger.
Re: JLKs 130 grians
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dar</div><div class="ubbcode-body">How do these compare to the 139 lapuas? </div></div>
They're better.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dar</div><div class="ubbcode-body">How do these compare to the 139 lapuas? </div></div>
They're better.
Re: JLKs 130 grians
Which is better depends on the round. In a 6.5x47 the 130 is better in my experience. In a 260, some prefer the 139, but I know two top winning shooters firing 260 that load the 130 Norma. There must be a reason they do that.
Which is better depends on the round. In a 6.5x47 the 130 is better in my experience. In a 260, some prefer the 139, but I know two top winning shooters firing 260 that load the 130 Norma. There must be a reason they do that.
Re: JLKs 130 grians
I dont hear much about Norma. I know they have good brass. I would assume the bullets would be the same quiality.
I dont hear much about Norma. I know they have good brass. I would assume the bullets would be the same quiality.
Re: JLKs 130 grians
130 Norma Golden Target is fine; I prefer it to Berger and JLK. Accurate and less ticky.
130 Norma Golden Target is fine; I prefer it to Berger and JLK. Accurate and less ticky.
