Justice1327
Well-Known Member
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25 SHERMAN (THE LATEST LASER)
- Thread starter elkaholic
- Start date
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Range session today with N570 and Berger 135 LRHT
TULA LRM primer and Peterson brass
62.2 3172
62.4. 3251
62.6. 3243
62.8 3249
63.0 3260
63.2 3259
63.4 3298
63.6 3294
63.8 3298
64.0. 3316
I did get sticky extractions on the last three rounds or so. Some flattening of primers, but no ejector marks.
TULA LRM primer and Peterson brass
62.2 3172
62.4. 3251
62.6. 3243
62.8 3249
63.0 3260
63.2 3259
63.4 3298
63.6 3294
63.8 3298
64.0. 3316
I did get sticky extractions on the last three rounds or so. Some flattening of primers, but no ejector marks.
Michael Hirschi
Active Member
Seems like some good velocities, What length is your barrel?
Michael Hirschi
Active Member
25 Sherman LA, Remington 700 long action preferred carbon barrel 22". I did a similar project with VT N570 powder last week. I was pretty unsure of what I was going to see. My first time really doing this. I will definitely as I see signs of pressure, decrease the amount of powder I step up each time. This first time I started with 1 grain improvements then backed down in some 1/2 grain increments. I started at 56 grains and worked up to 68 grains. I don't know what I did wrong but the Garmin chronograph didn't catch my first shot.
I used Hornady 134 eldm bullets, CCI Large rifle magnum primers and Nosler brass.
N570
56
57-2674 fps
58-2673 fps
59-2753 fps
60-2784 fps
61-2871 fps
62-2894 fps
63-2963 fps
64-2993 fps
65-3043 fps
66-3122 fps
67-3154 fps
68-3183 fps ejector mark
67.5- 3176 fps
67-3161 fps slight ejector mark
67- 3177 fps
66.5-3142 fps
I felt like I accomplished something good. But I'm really a greenhorn at this stuff. Let me know what you think.
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Justice1327
Well-Known Member
What distance is this shot at? Why are the lower powder charges shooting higher or what am I missing?
Michael Hirschi
Active Member
It was shot at 100 yds. Aim point is the top of the upside down V. I was surprised also that as I increased velocity it flattened out I guess.
lancetkenyon
Well-Known Member
Not a 25 Sherman, but a measly little 25SST. 26" 1:7.5" w. 131 SMKs over H1000. These are pronghorn CRUSHERS. They get out to 1389 yards REALLY quickly.
Michael Hirschi
Active Member
The target rings are 1/2". I use a leather rear sandbag and my own homemade front rest out of a scissor jack.
Attachments
lancetkenyon
Well-Known Member
Barrel harmonics.
Michael Hirschi
Active Member
That is a nice looking missile launcher. What is significant about 1389 yds. , I know it an extremely long shot for me.
To me, that looks like an unusually large POI distribution for 100 yards. I don't have experience with this exact bullet and cartridge, but I expect to see 1-1.5MOA groups when shooting a ladder test at 100 yards in all of my rifles. I don't normally do 1 grain increments though so maybe that is the difference. How many rounds are on this barrel at the beginning of the test?
Edit: I did go look back through some old 10 shot ladder targets and I do have some that seem to string out like yours did, just not quite as extreme. I haven't done 10 shot ladders for quite a while so I had to refresh my memory. I have seen quite a few ladders that produce sub MOA groups at 100 yards though.
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Michael Hirschi
Active Member
My barrel also is 1-7.5 twist
Michael Hirschi
Active Member
That's a 12 grain increase through the ladder test. It's also over 500 fps in velocity increase. My first time doing that. I didn't know what to expect. If you look at the bottom of the group 66-68 that would fit your description of 1-1.5 MOA
