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<blockquote data-quote="LVJ76" data-source="post: 2481980" data-attributes="member: 108965">I&#039;d say from February to November, you might remember the 2016 February Javelina Hunt, it was 90° on Saturday just south of Tucson. I remember my brother and I just melting out there. &nbsp;Before temp stable powders were available we just knew how to use the older powders, like IMR-4350, which is still used by many. I&#039;ve mentioned a couple of times before how the heat affects the POI in this powder which I used for many years in temps above 100°. These loads were developed in high temps. Now the POI change wasn&#039;t only over 85°, if I sighted in at 8 am at say 55°, in the afternoon at 75° there was still a POI change.Now the reason you develop these loads in the summer is so you don&#039;t have pressure issues later on, but it will still have an effect on POI.&nbsp; Now I am using for IMR-4451 and don&#039;t have to worry about changes in pressure or POI.</blockquote>

[QUOTE="LVJ76, post: 2481980, member: 108965"] I'd say from February to November, you might remember the 2016 February Javelina Hunt, it was 90° on Saturday just south of Tucson. I remember my brother and I just melting out there. Before temp stable powders were available we just knew how to use the older powders, like IMR-4350, which is still used by many. I've mentioned a couple of times before how the heat affects the POI in this powder which I used for many years in temps above 100°. These loads were developed in high temps. Now the POI change wasn't only over 85°, if I sighted in at 8 am at say 55°, in the afternoon at 75° there was still a POI change. Now the reason you develop these loads in the summer is so you don't have pressure issues later on, but it will still have an effect on POI. Now I am using for IMR-4451 and don't have to worry about changes in pressure or POI. [/QUOTE]

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