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Testing the 135gr Afterburner
In Bullets
Testing the 135gr Afterburner
In Bullets
warty110
Sep 04, 2022
I get what you’re saying completely, and had the same thought process. So I looked at several of those options too, and I just didn’t find anything that I thought looked like it would ultimately be worth dealing with groups opening a bit with temp swings. I looked at CFE 223 first, since it’s well known to produce top speeds with a lower rate of pressure, and it’s 8.4% compressed at max load, at 51.5gr (wow) and at 3030fps. I know it’s very dense stuff so that’s why it’s over 51gr and only 8.4% compressed. It would be a better option that RL-15.5 as far as top speed potential vs compression. Also, FWIW, I know compressed loads don’t translate or mean anything in regards to pressure. It’s not like compressing a gas or liquid. It just makes seating the bullet to a consistent depth (COAL), difficult and very frustrating lol. Here’s a look at max loads with several other options (because this gives you an idea of top speed potential and worse case scenario for case fill/compression): •H335 shows max 45.6gr at 2982fps and 95.9% fill •H4895 is max 45.9gr at 3005fps and 105.3% fill •BL-C(2) is max 49.2gr at 3023fps and 103.5% fill (node around 2971fps and 101.7%) •aa2460 is max 46.3gr at 2951 and 98.7% fill •aa2200 is 45.1gr at 2923fps and 101.9% fill •aa2495 is 45.4gr at 3009fps and 106.5% fill •aa2520 is max 47.8gr at 3005fps and 104.0% fill •TAC is 48.1gr at 2943fps and 102.4% fill •X-terminator is 46.5gr at 2935fps and 100% fill •IMR 3031 is max 44.9gr at 3040fps and 110.2% fill (node around 2975 and 107.5%) •Win 748 is max 47.3gr at 3025fps and 100.9% fill (node around 2958fps) •N140 is max 46.4gr at 2952fps and 108.6% fill •N130 is max 41.5gr at 2884fps and 101.9% fill •N540 is max 47.8gr at 2977fps and 108.5% fill •N530 is max 44.4gr at 2978fps and 101.3% fill •AR Comp is max 44.2gr at 2996fps and 104.2% fill •RL-15 is max 47.6gr at 3014fps and 109.2% fill •IMR 4064 is max 46.2gr at 2959fps and 112.3% fill I looked at a few others too, like IMR 4166 Hybrid 100V, etc and they were so compressed or so slow on MV potential I abandoned them immediately. Also, some, like aa2230 and Ramshot X-Terminator are the exact same powder, just labeled differently. So I didn’t look at both options. Anyway, you can see that according to the predictions, none of those, when you factor in potential node area and still the case fill and then temp sensitivity, look like they’d be worth it compared to IMR 8208 at only around 30-60fps slower at the top node. If I had a ton of the bullets, primers, brass, and tune, I’d be willing to test all the promising combinations, but unfortunately I don’t. So, I have to work with what looks to be the best and I still think 8208 or Benchmark are it, all things considered. I also fully understand QL is a prediction and real results could and likely would be quite different, but this at least gives me an idea on potential with all else equal and calculated as best as possible so far.
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warty110

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