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Long Range Hunting & Shooting
338 RCM
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<blockquote data-quote="memtb" data-source="post: 2785029" data-attributes="member: 75451"><p>Calvin, I have some very interesting data on RL 17 used in my .375 AI. I realize that this is "apples and oranges" as I've read that powders respond differently in different cartridges and at different load stages…compressed vs non-compressed. I had heard about the extreme temperature sensitivity of RL 17…..and as that's what I use, I ran an experimen! Here are my findings.</p><p></p><p> I do all of my load development on hot days…..preferably above 90F. So, I chose a cool day to perform the test. During testing the temperatures varied very little……a cool of - 4 F to a -3 F. The rifle and ammo were left outside for several hours prior to test to achieve ambient.</p><p></p><p> I only shot a 3 shot group, allowing plenty of time between shots so the rifle would return to ambient. I do not remember the velocity spread, but the 300 yard group was pretty respectable, but here's the big surprise…..I gained an 8 fps average above my hot day load development! <img class="smilie smilie--emoji" loading="lazy" alt="🤔" title="Thinking face :thinking:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f914.png" data-shortname=":thinking:" /> Go figure! <img class="smilie smilie--emoji" loading="lazy" alt="😉" title="Winking face :wink:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" data-shortname=":wink:" /> memtb</p></blockquote><p></p>
[QUOTE="memtb, post: 2785029, member: 75451"] Calvin, I have some very interesting data on RL 17 used in my .375 AI. I realize that this is “apples and oranges” as I’ve read that powders respond differently in different cartridges and at different load stages…compressed vs non-compressed. I had heard about the extreme temperature sensitivity of RL 17…..and as that’s what I use, I ran an experimen! Here are my findings. I do all of my load development on hot days…..preferably above 90F. So, I chose a cool day to perform the test. During testing the temperatures varied very little……a cool of - 4 F to a -3 F. The rifle and ammo were left outside for several hours prior to test to achieve ambient. I only shot a 3 shot group, allowing plenty of time between shots so the rifle would return to ambient. I do not remember the velocity spread, but the 300 yard group was pretty respectable, but here’s the big surprise…..I gained an 8 fps average above my hot day load development! 🤔 Go figure! 😉 memtb [/QUOTE]
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