Went out to the range this morning to form up some cases with Sierra 110 HP bullets and try out some new components on my rifle. Changed out the Wilson three prong flash hider on my upper with a D.D. flash hider. Assembled a new lower using a Aero Precision Gen. 2 stripped lower. The Gen. 2 has an enhanced magwell flair and a nylon tipped tension screw that engages the uppers rear takedown lug. Installed a RRA Varmint trigger group. 3.5-4 pound pull. Here is how she looks.
Also giving Accurate LT-30 powder a go round. Since I was just forming up cases, I did not chrono anything at this time. Everything formed up fine. No stamping or any other issues. Considering I was just using LT-30 7.62X39 load data, these puppies shot well.
Five shot group.
Six shot group.
Still need to reel in shots # 4 or 5. They seem to get away from me. Going to form up some more cases next weekend and then get back to my ladder tests. Again thanks for everyones help.
Did some load testing today. Loaded up cartridges with LT-30 and RL-7 powders topped with Lapua 123 gr. FMJ bullets. The LT-30 was a bust with the Lapua 123 gr. bullets. Although it is sold as giving greater velocity than H4198 in 30BR. In my A-30 it was quite slower than H4198 using the same components. It does a great job in forming up the shoulder with Sierra 110 gr. HP bullets. So I will use the remaining powder I have doing that. RL-7 was a completely different story. With RL-7 I was able to get average velocities over 2500 fps. I also got single digit S.D.'s with 4 out of 5 test loads. I had never had that happen when load testing before. And probably never will again. Here are the targets, 5 round groups.
The 2514 fps load worked out well for both accuracy and S.D.. Of course I did send round #4 out to left field as usual. Greg has been telling us that RL-7 is the powder for this caliber. I'm blessed that my local B.P.S. carries RL-7. Was able to pick up two more pounds yesterday. Next load test will be with some 125-130 gr. hunting bullets I have.
Now Greg was nice enough to supply me with some sub-sonic load data using RL-7 powder and Speer 200 gr. Hot-Cor bullets. I only made up nine cartridges, three cartridges with three different loads. Being I have never shot sub-sonic before. I needed to see what the difference would be between P.O.A and P.O.I.. Here are the targets at 50 yards
First shots, lightest load was center target. As you can see about 5-6" below P.O.A.. The Leupold scope I have on this rifle has a Mil-dot reticle. With using the second dot below the crosshairs I was able to adjust for the drop. I need a mulligan on the 1061 fps group. I know I messed up lining up the Mil-dot. With the 18" midlength barrel and adjustable gas block that was set restricted, the shot cases would not eject. I will have to spend a day just shooting sub-sonic with the gas block open all the way and see what happens. At least with a right hand side charging upper I was able to shoot the rifle like a straight pull bolt action.
Again thanks for everyone's help along this journey. And will post my results for the next set of load tests I do in a few weeks.
Rl 7 works great . AA2200 is good too just speed is a tini bit slower and takes more of it. Your speeds are in par with my 125 prohunters. Give them a try with RL 7.
Thanks Madcat. This is with an 18" midlength barrel. The charges with RL-7 range between 27.4-28.2 gr. in .2 gr. increments. None of the loads are compressed with the Lapua 123 gr. FMJ bullets. That's one reason I went with the 18" barrel, so I could hit over the magic 2500 fps without having to push the charge. I do have AA2200 powder to try later on. Now that I have my case forming teething problems taken care of. I can work on more load development. Next round I'm thinking Nosler 125 gr. Ballistic Tip bullets. Again thanks for posting your loads, always good info.
Another day in Paradise here in sunny Florida. Temps at time of testing ranged between 86-92 degrees. Not too bad, had a nice breeze going. Was trying to finish up chrono testing for the Lapua 123 gr. FMJ bullets. But got some erroneous speed readings from my Chrony. I loaded 10 once fired Federal with the Lapua bullets to form the shoulders and foul the barrel. Loaded 20 cartridges, five rounds each from 28.6-29.2 gr. of RL-7 in .2 gr. increments for both Lapua 123 gr. FMJ's and Sierra 125 gr. Pro-Hunter's.
Here are the targets I shot today. First, Cartridges with Lapua 123 gr. FMJ, Federal AR Match small primers, RL-7 powder, Federal brass, second firing.
Second; Cartridge, Sierra 125 gr. Pro-Hunter, Federal AR Match small primers, RL-7 powder, Federal brass, third firing.
The Sierra 125 gr. Pro-hunter bullets had the best group of the day behind 29 grains of RL-7. The group in the upper right corner center to center is .722". I'm going to have to check out my Chrony and try these again. But It was nice to get these cartridges loaded to a full charge. I still have some more brass to form up and also need to test the Nosler 125 gr. Ballistic Tipped bullets. So I have my work cut out for me.
To be honest I'm not sure if my chrono is reading right or not. I started about where I left off with the Lapua bullets but jumped the charge .4 gr. on the ladder test. First two strings matched in progression what I shot last time out. Then on/after the third string the velocity dropped off 100 fps. So I'm not sure whether last time out was faulty or this time out. I did run the Sierra 125 gr. pro-hunter's through and gave me an average velocity of 2558 fps. for the five shot group. Mr. DeMille, I'm ready for my closeup.
Going to retry these test again next week and see what the results are.