Posted: 2/10/2016 1:38:26 PM EDT
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I have been reloading for many years and wanted to test the potential of the LPR Mod 1, if I had to run an array of different brass from my rifle using the same bullet. I loaded all of these off a Dillon 650 and will say there is possible variation of .3-.4 in powder throws.
During the prep phase of using range pick up brass, is to remove the primer crimp, this was done using the Swage It http://swageit.com/ all I have to say is it works and it works efficiently. The only thing you might come across are the screws backing out a little over time, so check that as you go. I crimped the range brass using a Lee Crimp die (light crimp) as well as used a RCBS small base die to get everything back to spec and a Giraud Tri-Way trimmer to cut the brass back to spec as well. Components: Hornady 75gr BTHP IMR 8208 XBR Various Brass Virgin Lapua Brass Tula Small Rifle Primers 
Equipment Used: Magneto Speed V3 KAC LPR Mod 1 Vortex Razor Gen 2 Crux Nemesis Suppressor Test One: 23grs of 8208 in "virgin" Lapua Brass Velocity: 2613, 2614, 2622, 2581, 2582 Velocity Average: 2602 ES: 41 Group size: .65 MOA @ 100 Yards Test Two: 22grs of 8208 in Various Brass FC: 2542 PPU: 2524 Hornady: 2534 Lake City 07: 2531 CJ 92: 2486 WCC: 2500 Win: 2372 PMC: 2487 Average Velocity: 2497 ES: 170 Group Size: .91 MOA @ 100 Yards The surprising part was how low the Winchester brass velocity was, aside from that round fired the ES would have been, 56. This would be very acceptable for me and I would like to see someone else test this and see what results you get with using random brass. |
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Interesting... I had a reloading class from a guy who worked in a small arms company in Israel. He spent a very large amount of effort on weight sorting brass in an attempt to get brass with the same volume. He stated you needed the same case volumes to get the same load densities which leads to the best accuracy. In making his argument he showed data from virgin 338 LM brass made by Lapua - he weighed and sorted them and then used distilled water to determine the volume. In this case it worked out that weighing brass (of the same head stamp) was an excellent way to determine case volumes. The further into the class we went the more I realized this guy was all about load density and stated if you could produce the same load densities across a batch of mixed head stamp brass you would end up with very accurate rounds. This would require you to determine the case volume of all your cases and the density of your powder - much more time consuming. I think your data kind of proves this theory but you can't really know unless you found the volume of all the fired cartridges. I would expect the higher velocity cases to the smaller volumes...
Anyhow, this really isn't the right section to discuss reloading... And I'd really love to hear more about how your LPR shoots various loads? I've got the itch for an accurate 5.56 semi-auto and I have a KAC already so I'm interested in the LPR. I know they are out in the wild but I don't see many reviews on them - I'd like to know how well it shoots before I go down this rather spendy path... Spooky |
| My LPR shoots 5.56 Black Hills 77 gr. SMK consistently 3/4 inch groups at 100 yards. Two weeks ago a buddy shot the same rifle, same load, at 200 yards and had a 3/4 inch group and a 9/10 inch group. Mine at 200 was 1 1/2 inches. It is a good shooter for sure. It shoots so well with black Hills it's hard to spend time trying to better it. Good luck and keep the thread updated. |
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Quoted:
I have been reloading for many years and wanted to test the potential of the LPR Mod 1, if I had to run an array of different brass from my rifle using the same bullet. I loaded all of these off a Dillon 650 and will say there is possible variation of .3-.4 in powder throws. During the prep phase of using range pick up brass, is to remove the primer crimp, this was done using the Swage It http://swageit.com/ all I have to say is it works and it works efficiently. The only thing you might come across are the screws backing out a little over time, so check that as you go. I crimped the range brass using a Lee Crimp die (light crimp) as well as used a RCBS small base die to get everything back to spec and a Giraud Tri-Way trimmer to cut the brass back to spec as well. Components: Hornady 75gr BTHP IMR 8208 XBR Various Brass Virgin Lapua Brass Tula Small Rifle Primers http://i.imgur.com/DaDYH4u.jpg Equipment Used: Magneto Speed V3 KAC LPR Mod 1 Vortex Razor Gen 2 Crux Nemesis Suppressor Test One: 23grs of 8208 in "virgin" Lapua Brass Velocity: 2613, 2614, 2622, 2581, 2582 Velocity Average: 2602 ES: 41 Group size: .65 MOA @ 100 Yards Test Two: 22grs of 8208 in Various Brass FC: 2542 PPU: 2524 Hornady: 2534 Lake City 07: 2531 CJ 92: 2486 WCC: 2500 Win: 2372 PMC: 2487 Average Velocity: 2497 ES: 170 Group Size: .91 MOA @ 100 Yards The surprising part was how low the Winchester brass velocity was, aside from that round fired the ES would have been, 56. This would be very acceptable for me and I would like to see someone else test this and see what results you get with using random brass. Good post. I wish IMR would publish 5.56 only data like ramshot does. I loaded the XBR up to 23.4 with the 77gr SMK maglength with no pressure signs but did not go higher. Average was 2634 out of an unsuppressed 18" barrel. Your deviation in powder throw seems high if you are using the standard dillon measure on the 650, even with 8208. I have only loaded a pound of it on the 650, but it seemed to average .2 grain throw deviation on the throws I weighed. |
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Been playing with some loads for my LPR lately. It seems my barrel is a little faster than average. A 77 TMK or SMK ahead of 22.8 grains of 8208 XBR in a LC case with a BR4 showd 2670 FPS on the Labradar with an ES of 22 and an SD of 8 for ten shots. Going up to 23 grains puts me at 2694 FPS.
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Quoted:
Been playing with some loads for my LPR lately. It seems my barrel is a little faster than average. A 77 TMK or SMK ahead of 22.8 grains of 8208 XBR in a LC case with a BR4 showd 2670 FPS on the Labradar with an ES of 22 and an SD of 8 for ten shots. Going up to 23 grains puts me at 2694 FPS. Sounds like an exceptional barrel unless it is 120F ambient. My Douglas 18" mk12 is 150fps slower with the same bullet/charge weight (wolf primer). |
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Quoted:
Sounds like an exceptional barrel unless it is 120F ambient. My Douglas 18" mk12 is 150fps slower with the same bullet/charge weight (wolf primer). Quoted:
Quoted:
Been playing with some loads for my LPR lately. It seems my barrel is a little faster than average. A 77 TMK or SMK ahead of 22.8 grains of 8208 XBR in a LC case with a BR4 showd 2670 FPS on the Labradar with an ES of 22 and an SD of 8 for ten shots. Going up to 23 grains puts me at 2694 FPS. Sounds like an exceptional barrel unless it is 120F ambient. My Douglas 18" mk12 is 150fps slower with the same bullet/charge weight (wolf primer). Everything was shot between 68° and 75°. We've had a nice spring this year. 
Now that I've got a chronograph I don't mind using, I may take it up to 23.4 again just to see what it shows. I hit a flat spot last time around 23.1 where velocity actually dropped - 23.0-23.2 all showed the same velocity within +- 12 FPS. |
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Quoted:
Everything was shot between 68° and 75°. We've had a nice spring this year.
Now that I've got a chronograph I don't mind using, I may take it up to 23.4 again just to see what it shows. I hit a flat spot last time around 23.1 where velocity actually dropped - 23.0-23.2 all showed the same velocity within +- 12 FPS. Also experienced little change from 23.0-23.2. It started to jump again at 23.4. I did not go higher as I started to see pressure signs that showed up with much heavier charges and higher velocities in TAC or 2000mr. Staying posted for your results if you go higher. While I can't encourage it, I find the data that most manufacturers publish for .223 to be conservative in a 5.56 chamber. |