wilkup
Well-Known Member
No worries Rich. It's a 23" Bartlein barrel.
7 mm SHERMAN SHORTMAG vs 7 SAUM
- Thread starter elkaholic
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elkaholic
Well-Known Member
That's what I was thinking it was 23-24? That is SMOKIN and it shows that the SS case does not lose NEAR the velocity per inch as larger capacity cases with the same bore. You just can't beat efficiency!....Rich
wilkup
Well-Known Member
*New Test Loads*
Temperature: 87 degrees
Humidity: 44%
Pressure: 29.89 steady
Elevation: 900'
2.75" COAL
Sierra 140gr Spitzer Boat Tail
23" Bartlein 5r barrel
Alliant Reloader 19
All loads are average of 3 rounds
60.0gr - 2,979fps (3,000; error; 2958)
62.0gr - 3,100fps (3,086; 3,087; 3,127)
63.0gr - 3,156fps (3,185; 3,130; 3,152)
64.0gr - 3,194fps (3,190; 3,162; 3230)
65.0gr - 3,318fps (3,199; 3446; 3,310) (Compressed load)
66.0gr - 3,307fps (error; 3,307; error) (Compressed load)
I think a faster powder might be better for this weight bullet. Any ideas on where to go from here? I had no pressure signs from brass or bolt lift and feel if there were a higher capacity, I'd be able run these quite a bit faster.
Temperature: 87 degrees
Humidity: 44%
Pressure: 29.89 steady
Elevation: 900'
2.75" COAL
Sierra 140gr Spitzer Boat Tail
23" Bartlein 5r barrel
Alliant Reloader 19
All loads are average of 3 rounds
60.0gr - 2,979fps (3,000; error; 2958)
62.0gr - 3,100fps (3,086; 3,087; 3,127)
63.0gr - 3,156fps (3,185; 3,130; 3,152)
64.0gr - 3,194fps (3,190; 3,162; 3230)
65.0gr - 3,318fps (3,199; 3446; 3,310) (Compressed load)
66.0gr - 3,307fps (error; 3,307; error) (Compressed load)
I think a faster powder might be better for this weight bullet. Any ideas on where to go from here? I had no pressure signs from brass or bolt lift and feel if there were a higher capacity, I'd be able run these quite a bit faster.
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elkaholic
Well-Known Member
Maybe some RL22 or 23. I find it strange that 66 grs. showed less velocity than 65 though with no pressure signs? I agree that there should not have been pressure signs with that load. Also there was a huge jump from 64-65. Are you sure those aren't reversed?......Rich
wilkup
Well-Known Member
All brass looks good, tight primer pockets and no ejector marks. I'm not sure what the deal with the compressed loads were... 66gr was just below the top of the case after a lot of tapping, 65gr was still full but didn't require the case tapping to set bullet for seating. I've included all recordings along with average in previous post, for more information.
wilkup
Well-Known Member
What sort of speeds did you get with RL17?
59.0 RL-17 3250 fps 26 inch barrel 140 accubond ws2 coating. the load was not compressed. one thing I did notice was a lot of barrel heat.
Idaho Trecker
Well-Known Member
I'd give hybrid 100v a try if you want to go with a faster burn rate. It's better in the temperature sensitivity department than rl 17. In my 300 ss testing it was between 100v and rl 17 until I finally tried rl 26 in it. I was getting great accuracy speed and es with 100v. I saw a mention of barrel heat with rl 17 which I haven't really noticed before with that powder but have with Superformance. That might be another option for you but again it's pretty temp sensitive.
wilkup
Well-Known Member
I'm going to try using RL26, starting at 62.0 and run up from there in 1.0 gr increments. I can fit about the amount in with RL 26 as I could with RL19, I just got pressure signs above 63.5gr with the Berger 180 hybrid.
wilkup
Well-Known Member
wilkup
Well-Known Member
Very little barrel heat from the RL26 loads, might wanna check it out =)
I was comparing RL-17 to IMR 4350 with the 140 accubond it felt warmer to touch and took longer to cool between shots. I do use RL-26 with 180 hybrids it works great nowhere near as fast as the 7mm SS and a lot longer that's why I am looking to rebarrel over winter
