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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy lost on warmer weather
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<blockquote data-quote="Mike Matteson" data-source="post: 2954842" data-attributes="member: 101791"><p>Sorry being so lone getting back. Part of it is that your max load and are hot loads to start with. In Mexico-North I worked up a load for my 308NM a great many years ago in the winter there. (if you want to call a winter) Weather changed about 50 degree between times. I had a 165gr Nosler at 3400fps and excellent grouping in the winter time. It got to be in the early summer or June, and The first one round down the tube that that type of powder load, just to see if anything had changed. I below a primer out of my case and had a hell-of-time getting my bolt open. One thing for sure I hadn't done any checking on how powders reacted to temp. A close friend with me that day brought that up. I took 49 out of 50 cases apart back at home. Changed to H4350 and lost a 100fps, but never had a problem after that. I hunt in weather from -20 to 110+. </p><p>Both times I had work my load up to about 5grs above the max shown on any reloading manual. I know that hot and I load that way in all my rifes. I do work up loads to achieve that those increase powder loads. That was the first time I ever when about the reloading manual callout. I stop at or below creatoring the primer. Lord help me if I am showing ejector marks on the case. I stop before getting there. Now I do run ups on my powder loads of anywhere from between .25grs to .5 grs in single loads to just watch for how my primer are reacting to the different powder loads. I combine that in ladder test now. </p><p>A 30fps variation is about 8.5" @ 1000yds. A 50fps variation would change your bullet by as much as 14" @ 1000yds. So tell me where you want to be at. </p><p>I Learned a lot here over the past few years.</p></blockquote><p></p>
[QUOTE="Mike Matteson, post: 2954842, member: 101791"] Sorry being so lone getting back. Part of it is that your max load and are hot loads to start with. In Mexico-North I worked up a load for my 308NM a great many years ago in the winter there. (if you want to call a winter) Weather changed about 50 degree between times. I had a 165gr Nosler at 3400fps and excellent grouping in the winter time. It got to be in the early summer or June, and The first one round down the tube that that type of powder load, just to see if anything had changed. I below a primer out of my case and had a hell-of-time getting my bolt open. One thing for sure I hadn't done any checking on how powders reacted to temp. A close friend with me that day brought that up. I took 49 out of 50 cases apart back at home. Changed to H4350 and lost a 100fps, but never had a problem after that. I hunt in weather from -20 to 110+. Both times I had work my load up to about 5grs above the max shown on any reloading manual. I know that hot and I load that way in all my rifes. I do work up loads to achieve that those increase powder loads. That was the first time I ever when about the reloading manual callout. I stop at or below creatoring the primer. Lord help me if I am showing ejector marks on the case. I stop before getting there. Now I do run ups on my powder loads of anywhere from between .25grs to .5 grs in single loads to just watch for how my primer are reacting to the different powder loads. I combine that in ladder test now. A 30fps variation is about 8.5" @ 1000yds. A 50fps variation would change your bullet by as much as 14" @ 1000yds. So tell me where you want to be at. I Learned a lot here over the past few years. [/QUOTE]
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Accuracy lost on warmer weather
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