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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
140g NBT @ 800 yards
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<blockquote data-quote="remingtonman_25_06" data-source="post: 139400" data-attributes="member: 1403"><p>Alright heres the deal guys, I have a great load worked up using the 140g NBT and RL-22 in my 7 RM giving consistent 3250-3275fps and 1/2 MOA grouping at 100-200-400 yards so far. I went shooting the other day and wanted to zero my 140's as I was going to start using them up on yotes and rocks etc..It was cold, about 30-32 degrees, im around 700ft above sea level. I got my crony and rifle set up at 200 yards to check velocity and accuracy, and also to zero at 200 yards instead of 100. First couple shots were little bit off due to being sighted in with different bullets, but were within an inch of each other. I adjusted the scope and put 2 shots within an inch dead center, maybe 1/4" above. Velocity was very close on this outing giving something like 3275, 3276, 3282. Couldn't really figure it out because when I worked up this load it was in the fall around 60-70 degrees and only produced 3250fps on couple different outings, so dont know whats up there. Anyways I got everythign zeroed, rifle checked for velocity, now pack everything back up and drive back to 800 yards and work on the 15" square gong. According to Nosler, the 140g NBT has a BC of .485, all I can say is I wish that was the case, but I dont think so...According to my program, I needed to have 59 clicks or so, or 15 MOA "UP" to be dead on at 800 from my 200 yard zero. I had my dad as a spotter, I dialed up 59 clicks, there was very little to no wind so I left it alone for now. First shot was way way low, no surprise there I thought. Might have pulled a little, cold bore shot..shot #2 landed in the same spot. My dad said it appeared to be about 5-6 feet low. I ended up having to add 3.5 MOA or about 14 clicks more to be dead on at 800. Anybody got any ideas as to whats going on?? I didn't think it would be that far off, but if I drop the BC down to even .400, its still doesn't match up at all. I know the BC of the 140g BT cant be in the .3's. Pressure doesn't really seem to have that much of an effect on things looking at the ballistic side of things, maybe a couple clicks yes, not 12-14!! Could it be the cold air, low elevation?? I dont know, I'm stumped, but I've noticed a lot lately that at 800 yards, I"m shooting anywhere from 2-4 MOA low with various comboes. I'm zeroing at a known distance, with known velocitys, so just dont know what else could be wrong for it to be that far off!? BTW, after noting where I needed to be click wise, hitting the 15" plate was piece of cake. NOthing substitutes getting out in the field and shooting, cant rely on the good ol computer for everything...</p></blockquote><p></p>
[QUOTE="remingtonman_25_06, post: 139400, member: 1403"] Alright heres the deal guys, I have a great load worked up using the 140g NBT and RL-22 in my 7 RM giving consistent 3250-3275fps and 1/2 MOA grouping at 100-200-400 yards so far. I went shooting the other day and wanted to zero my 140's as I was going to start using them up on yotes and rocks etc..It was cold, about 30-32 degrees, im around 700ft above sea level. I got my crony and rifle set up at 200 yards to check velocity and accuracy, and also to zero at 200 yards instead of 100. First couple shots were little bit off due to being sighted in with different bullets, but were within an inch of each other. I adjusted the scope and put 2 shots within an inch dead center, maybe 1/4" above. Velocity was very close on this outing giving something like 3275, 3276, 3282. Couldn't really figure it out because when I worked up this load it was in the fall around 60-70 degrees and only produced 3250fps on couple different outings, so dont know whats up there. Anyways I got everythign zeroed, rifle checked for velocity, now pack everything back up and drive back to 800 yards and work on the 15" square gong. According to Nosler, the 140g NBT has a BC of .485, all I can say is I wish that was the case, but I dont think so...According to my program, I needed to have 59 clicks or so, or 15 MOA "UP" to be dead on at 800 from my 200 yard zero. I had my dad as a spotter, I dialed up 59 clicks, there was very little to no wind so I left it alone for now. First shot was way way low, no surprise there I thought. Might have pulled a little, cold bore shot..shot #2 landed in the same spot. My dad said it appeared to be about 5-6 feet low. I ended up having to add 3.5 MOA or about 14 clicks more to be dead on at 800. Anybody got any ideas as to whats going on?? I didn't think it would be that far off, but if I drop the BC down to even .400, its still doesn't match up at all. I know the BC of the 140g BT cant be in the .3's. Pressure doesn't really seem to have that much of an effect on things looking at the ballistic side of things, maybe a couple clicks yes, not 12-14!! Could it be the cold air, low elevation?? I dont know, I'm stumped, but I've noticed a lot lately that at 800 yards, I"m shooting anywhere from 2-4 MOA low with various comboes. I'm zeroing at a known distance, with known velocitys, so just dont know what else could be wrong for it to be that far off!? BTW, after noting where I needed to be click wise, hitting the 15" plate was piece of cake. NOthing substitutes getting out in the field and shooting, cant rely on the good ol computer for everything... [/QUOTE]
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140g NBT @ 800 yards
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