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Rifles, Reloading, Optics, Equipment
Reloading
H4350 hotter than normal?
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<blockquote data-quote="RogerPA" data-source="post: 1380502" data-attributes="member: 70741"><p>Regarding "tbrice23"'s comment on massive increases in pressure/velocity in sub-freezing temps: I've been searching for a reference to this observation! Just this week, while shooting the exact batch of loads created and tested this past fall in 50 degree temps, I decided to fire a few rounds in the 4 degree temps. The rifle is a Christensen 26 Nosler, with 72.0 grains of Retumbo, Federal 215M primer, and 130 gr. Berger VLD hunting bullet. I'll spare you the intimate details, but the bottom line is a modest load that in the fall shot under 1/2" moa without a hint of pressure issues, in the 4 degree temps is a load that's hard to open the bolt on, and has two bright extractor rings printed on the headstamp. (I even pulled a couple of rounds just to make sure nothing funky happened. Every load was exactly 72.0 grains, and every bullet pulled weighed 130 grains.). I'm familiar with excessive heat causing pressure variations, but not so much with cold. Is this a common occurrence that doesn't get much press? Or perhaps a phenomenon related to certain barrels and/or powder? Thank you for sharing whatever experience you've gained in this regard.</p></blockquote><p></p>
[QUOTE="RogerPA, post: 1380502, member: 70741"] Regarding "tbrice23"'s comment on massive increases in pressure/velocity in sub-freezing temps: I've been searching for a reference to this observation! Just this week, while shooting the exact batch of loads created and tested this past fall in 50 degree temps, I decided to fire a few rounds in the 4 degree temps. The rifle is a Christensen 26 Nosler, with 72.0 grains of Retumbo, Federal 215M primer, and 130 gr. Berger VLD hunting bullet. I'll spare you the intimate details, but the bottom line is a modest load that in the fall shot under 1/2" moa without a hint of pressure issues, in the 4 degree temps is a load that's hard to open the bolt on, and has two bright extractor rings printed on the headstamp. (I even pulled a couple of rounds just to make sure nothing funky happened. Every load was exactly 72.0 grains, and every bullet pulled weighed 130 grains.). I'm familiar with excessive heat causing pressure variations, but not so much with cold. Is this a common occurrence that doesn't get much press? Or perhaps a phenomenon related to certain barrels and/or powder? Thank you for sharing whatever experience you've gained in this regard. [/QUOTE]
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Reloading
H4350 hotter than normal?
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