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Rifles, Reloading, Optics, Equipment
Reloading
Norma MRP temp sensitive?
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<blockquote data-quote="Mike Matteson" data-source="post: 3095839" data-attributes="member: 101791"><p>I became aware of temp stable powder in the 1998 or so. I had a primer come out of the case with IMR 4381 or IMR 4350. Temp change was about 50 to 70 dgr. (Not sure just how much) I am not saying that I wasn't loading hot, because I was. I became aware of Hodgdon powers at that time. Two other factor is: Mostly I use H4350 because it one that doesn't change much in a wide swing of temps. It's doesn't change much in temp from on end to another -20 to 110. 50fps changes your POI by 14" @ 1000 yds. I do believe that most shooter don't realize the problem in changes in velocity or SD. I see from time to time people here showing case with ejector makes on there case. When were those load develop and what temp. </p><p>The other is I develop a load that I can shot in cold bore shots in all type of weather, and I hold my range to 500yds. i use rifle that the velocities petty much match each others. That way, I don't have to think about which rifle or the POI is at. </p><p>At the time I used IMR powders I got better velocity from them, and accuratic was very good also. IMR4831 changes about 1fps and IMR changes about 2/3fps. So if you are not aware of those possible problems, you can be in a huge hurt locker. </p><p>At that time I gave away about 16lbs of IMR powders and haven't used them going forward. </p><p>Like I say use what you want. Just want people to be aware of the possible problems.</p></blockquote><p></p>
[QUOTE="Mike Matteson, post: 3095839, member: 101791"] I became aware of temp stable powder in the 1998 or so. I had a primer come out of the case with IMR 4381 or IMR 4350. Temp change was about 50 to 70 dgr. (Not sure just how much) I am not saying that I wasn't loading hot, because I was. I became aware of Hodgdon powers at that time. Two other factor is: Mostly I use H4350 because it one that doesn't change much in a wide swing of temps. It's doesn't change much in temp from on end to another -20 to 110. 50fps changes your POI by 14" @ 1000 yds. I do believe that most shooter don't realize the problem in changes in velocity or SD. I see from time to time people here showing case with ejector makes on there case. When were those load develop and what temp. The other is I develop a load that I can shot in cold bore shots in all type of weather, and I hold my range to 500yds. i use rifle that the velocities petty much match each others. That way, I don't have to think about which rifle or the POI is at. At the time I used IMR powders I got better velocity from them, and accuratic was very good also. IMR4831 changes about 1fps and IMR changes about 2/3fps. So if you are not aware of those possible problems, you can be in a huge hurt locker. At that time I gave away about 16lbs of IMR powders and haven't used them going forward. Like I say use what you want. Just want people to be aware of the possible problems. [/QUOTE]
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Reloading
Norma MRP temp sensitive?
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