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Discussion in 'Technical Articles - Discussion' started by ADMIN, Jul 30, 2017.
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I enjoyed this article! I like the idea of having a single go to rifle for all situations. I feel like I spend less time shooting and enjoying my builds than building riles and developing loads. I think rather than constantly chasing the new and better, all the while compromising on small things here and there, I should just build one ultimate rifle and burn the barrel up. I love the writers choice of components and only question one thing... What is the reasoning behind using 130gr instead of 140gr bullets? I am starting load development on a 6.5 SAUM right now and am planning on running 140s, i might reconsider if there is a solid case for the 130s.
Thanks for the compliments and questions. I wrote X-ray and asked him to send me his response to your question. This is what he sent me to answer your questions.
What is the reasoning behind using 130gr instead of 140gr bullets? I am starting load development on a 6.5 SAUM right now and am planning on running 140s, i might reconsider if there is a solid case for the 130s.
It's a great question.
There is no real good reason for choosing 130's over 140's other then personal preference. There are a couple of reasons why I personally chose the bullets that I did to shoot.
1. It was what I had on hand.
2. BC/Velocity ratio
I'm currently shooting the 130 JLK which for the weight class has an exceptional BC of 0.620 G1. So with the combination of velocity and weight it just makes sense to be pushing the 130 class bullet. I've since gathered several more bullets to play with ranging from the 143grn ELD-X, to 127grn Barns LRX, 129grn Accubond LR, 130grn Swift Scirocco 2.
Quickload data for my rifle and 130 JLK sits me at a node of 61.5grns H1000, Fed215M, Norma brass, and at 3034fps with the 24"barrel.
Now, if i messed with the 143 ELD-x bullet which has the same suggested BC as the 130 JLK, being pushed at the same velocity, it's basically the same end game besides gaining a little bit of energy down range. I plugged in a 140grn Amax as a comparison and QL is giving me an estimate of 2983fps, it'll be pretty close to the same with the 143 ELD-X. The reason I'm not giving you the 143grn ELD-X load is because my ammo box with the 143's are all boxed up and in storage for the moment.
Given the 140 amax numbers i'd be 1 MOA of elevation more, .2MOA more wind and about 30ft/lbs of energy more with them over the 130's. So that's my reasons, take them at face value as your numbers/ barrel/ components might differ, it's all personal preference in the end.
I had no idea that the 130 JLK had such a spectacular BC! It makes no since to run a heavier bullet if there is no gain in BC! I just assumed that a 140 gr bullet of similar design would always have a higher BC. After looking at JLK's website it looks like the 140gr 6.5 and the 130gr 6.5 are dimensionally identical with the weight difference coming from the smaller lead core inside the 130gr. i will have to order some JLK's and give them a try. Thanks for the response!
You're welcome. Thanks for the questions. Glad to be able to help you.