Getting over 3200 shouldn't be a problem in your SST with multiple powders.
My rifle has always liked being jumped at 15k but it shot well at 20k also. The second 25SST I worked with shooting RL26 preferred 18k.
The speed shift is definitely puzzling me right now as well. Between moving shops and the spines on my notebooks falling apart I'm missing a page or 2 no doubt. Also if I'm shooting off my concrete porch if Ambient air temp is 105* then the porch temp I'd probably say is 130-140* and I have a feeling that's were I'm seeing the increased velocity. Been meaning to build a platform to shoot off. Another thing with this rifle is accuracy falls of noticeably after 30 rounds for whatever reason so I always cleaned it before it gets past that point and I noticed my POI would rise on targets. It's at about 30 now so I'm going to keep shooting it this time and see what the velocity does. When I was over jobs on the frac/sand side ever summer I had guys fall out from heat stroke. One day I took a infrared thermometer out to one of my locations. Air temp was 106*, I measured the ground temp (caliche) 140*, I measured the dance floor (polymer pads where we stored sand boxes) where my hands were working 160*! I went over by my belt operator and measured the temp by his head on the belts 120*. So I've found when if I'm shooting off the porch it's actually significantly hotter than the ambient air temp and that might have caused the increased velocity as well.
Here is 63.16grs in a virgin case after tapping it down. As you can see it's up in the neck and the bullet is pushing it down. I made a 10" drop tube out of an arrow shaft yesterday but it's not long enough to help. In the past with n570 I've just set my loading block on my thumblers tumbler base to vibrate powder down.
My rifle has always liked being jumped at 15k but it shot well at 20k also. The second 25SST I worked with shooting RL26 preferred 18k.
The speed shift is definitely puzzling me right now as well. Between moving shops and the spines on my notebooks falling apart I'm missing a page or 2 no doubt. Also if I'm shooting off my concrete porch if Ambient air temp is 105* then the porch temp I'd probably say is 130-140* and I have a feeling that's were I'm seeing the increased velocity. Been meaning to build a platform to shoot off. Another thing with this rifle is accuracy falls of noticeably after 30 rounds for whatever reason so I always cleaned it before it gets past that point and I noticed my POI would rise on targets. It's at about 30 now so I'm going to keep shooting it this time and see what the velocity does. When I was over jobs on the frac/sand side ever summer I had guys fall out from heat stroke. One day I took a infrared thermometer out to one of my locations. Air temp was 106*, I measured the ground temp (caliche) 140*, I measured the dance floor (polymer pads where we stored sand boxes) where my hands were working 160*! I went over by my belt operator and measured the temp by his head on the belts 120*. So I've found when if I'm shooting off the porch it's actually significantly hotter than the ambient air temp and that might have caused the increased velocity as well.
Here is 63.16grs in a virgin case after tapping it down. As you can see it's up in the neck and the bullet is pushing it down. I made a 10" drop tube out of an arrow shaft yesterday but it's not long enough to help. In the past with n570 I've just set my loading block on my thumblers tumbler base to vibrate powder down.
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