The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Rifles Big Bores R-15 temp sensitivity + barrel lengthGo | New | Find | Notify | Tools | Reply | |
| One of Us |
How sensitive is R-15 to the cold, say 50 degrees temp change from 30degrees to 80degrees will there be much of a velocity change. What kind of velocity change would you expect to get going from a 25inch barrel on a 500 Jeffery to a 22 inch barrel? My quess is 25fps change per inch but again that's a quess. "An individual with experience is never at the mercies of an individual with an argument" | ||
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If it's any help, I chronoed my 470 loads back last spring and at 60 degrees the mv was 2040-2050, at 70-75 degrees the mv was 2140-2150 and at 85+ the mv was 2175-2200. That was 87gr of RL15, Kynoch wad and 500gr Woodleigh softnose. | |||
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I must say that RL 15 has been one of the worst for temp changes that I've seen. No big deal in a double or big bore in Africa, but I like different powders for the states when hunting in colder weather.....like Varget and H4350...if they work close to my RL 15 loads. Gary DRSS NRA Lifer SCI DSC | |||
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| One of Us |
Agreed Gary, Varget is one of the least temperature powders on the market today and it does mimic RL-15 very well. "An individual with experience is never at the mercies of an individual with an argument" | |||
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This is consistent with what I've seen in temp diffs of 60degrees vs 30degrees F. Antlers Double Rifle Shooters Society Heym 450/400 3" | |||
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The Accurate Reloading Forums THE ACCURATE RELOADING.COM FORUMS Rifles Big Bores R-15 temp sensitivity + barrel length
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