Armory Sponsor
Posted: 6/12/2013 9:45:59 AM EDT
|
Hope this is the right section, if not please move.
I am getting into loading rifle, (been loading pistol for a couple years now) Well anyway. The only powder I have been able to get my hand on is the Alliant AR-Comp powder. Since neither one of my reloading manuals have anything on this powder, I went to Alliant website. Now they list a couple different bullet weight and what charges they used. Ok good starting point. He is where I run into another problem. Projectiles - The only ones I have been able to put my hands on is the Sierra Varminter 63gr SMP. I sent Alliant an email stating the issue I was having and if they could shed some light on this. The email I received back from Alliant. They told me was to take the bullet and powder weight and split it down the middle then reduce by 10% and work up from there if need be. This scared me a little. My question is. Is this a common practice when using odd weight bullets? I did this anyway. Here is what I came up with. What Alliant had listed on there site. 55g HPBT - 25.6gr 68g HPBT - 23.5gr The split in powder weight is 2.2gr's. Split the 2.2 in half and get 1.1gr's The split in bullet weight is 13g. So 61g bullet is in the middle. So with a little math, I came up with 61g bullet with 24.5gr's of AR-Comp. From there with a little more math I was able to come up with powder weight for each bullet, from there I reduced by 10%, thus giving me 22.5gr's of AR-Comp to start with. With the extra math I was able to get powder weight for the 63g bullet I have. What I came up with for the 63g bullet is 24.2gr's of AR-Comp. I reduced this by 10%, this gave me a starting load of 21.78. I round down to 21.5 to start. I did make up a couple round of ammo. I load 10rd's with 21.5gr, next load was 10rd's with 22.8gr, Next was 10rd's with 23.0gr and 23.5gr. Am I on the right track here? Rifle info - Daniel Defense M4 with a 18'' 1n7 twist barrel. All LC brass. Bullet OAL is 2.260 Primers - CCI SRP #400 Has anybody worked any load using this powder? If so what bullet and weight and charge weight? I sure hope you all can make out what I'm trying to say. If not let me know and I will do what I can to better explain. Thanks Bryan |
|
Bryan,
AR-Comp is a more temp insensitive version of RL-15. Using this as a starting point, I would have started with a min charge of RL-15, then reduce 10% and work up. IOW, I would have started at 22.0gr of AR-Comp with the 63gr SMP. What primer are you using? Bill |
|
Quoted:
Bryan, AR-Comp is a more temp insensitive version of RL-15. Using this as a starting point, I would have started with a min charge of RL-15, then reduce 10% and work up. IOW, I would have started at 22.0gr of AR-Comp with the 63gr SMP. What primer are you using? Bill Ok cool, I didn't know AR-Comp is comparable to RL-15. That is good to know. Will look up RL-15 info later today when I get a chance. I am using CCI SRP #400 (Edited first post) Bryan |
|
Quoted:
Quoted:
Bryan, AR-Comp is a more temp insensitive version of RL-15. Using this as a starting point, I would have started with a min charge of RL-15, then reduce 10% and work up. IOW, I would have started at 22.0gr of AR-Comp with the 63gr SMP. What primer are you using? Bill Ok cool, I didn't know AR-Comp is comparable to RL-15. That is good to know. Will look up RL-15 info later today when I get a chance. I am using CCI SRP #400 (Edited first post) Bryan The load data overlaps, but is NOT interchangeable. This is why Alliant told you what they did. CCI-400 is not a primer to push very hard. ETA: Welcome to ARFcom! |
|
Quoted:
Quoted:
Quoted:
Bryan, AR-Comp is a more temp insensitive version of RL-15. Using this as a starting point, I would have started with a min charge of RL-15, then reduce 10% and work up. IOW, I would have started at 22.0gr of AR-Comp with the 63gr SMP. What primer are you using? Bill Ok cool, I didn't know AR-Comp is comparable to RL-15. That is good to know. Will look up RL-15 info later today when I get a chance. I am using CCI SRP #400 (Edited first post) Bryan The load data overlaps, but is NOT interchangeable. This is why Alliant told you what they did. CCI-400 is not a primer to push very hard. ETA: Welcome to ARFcom! Thanks for the Welcome. What do you mean by the CCI #400 is not a primer to push very hard? |
|
Quoted:
Thanks for the Welcome. What do you mean by the CCI #400 is not a primer to push very hard? The primer cup thickness of the CCI-400, Remington 6 1/2 and the Winchester SRP (the newer non plated ones), are not thick enough for maximum .223 pressures, let alone trying to duplicate 5.56. If you wan to do that, go with Remington 7 1/2's, CCI-450's, or CCI-41's. |
|
Quoted:
Quoted:
Thanks for the Welcome. What do you mean by the CCI #400 is not a primer to push very hard? The primer cup thickness of the CCI-400, Remington 6 1/2 and the Winchester SRP (the newer non plated ones), are not thick enough for maximum .223 pressures, let alone trying to duplicate 5.56. If you wan to do that, go with Remington 7 1/2's, CCI-450's, or CCI-41's. Thanks for the info. Will make note of this. Bryan |
Armory Sponsor