Post by Richard on Jan 23, 2020 14:14:23 GMT -5
Just some normal stuff….
Tuesday morning here in western NC brought range temperatures down to 22* with a little variable wind/breeze but skies were clear. The first group #1 was “more or less” to foul the barrel some and again, I using the “cheaper” Speer 300 gr. soft point bullets to “little by little”, get rid of them. Due to some LabRadar issues, the first five of six shots was not captured. I am still working out details, even after speaking with a LR tech on the phone. So, here I am trying to get the right distance of the LR in relation to the barrel/muzzle/brake along with the right settings in the program itself; using the inexpensive bullets, also has its advantages. Even with all the messing around, I was able to get six shots in .926”…………and, then, captured the sixth and remaining 20 shots. This, using a 10/62 duplex of N-110 and N-120.
Sticking with the same duplex, I substituted the 300 gr. Fury Star for the Speer and you can see how the group greatly improved. Was it the fact that the barrel had now been fouled or is it just the change to a better bullet? I tend to feel the Fury made the difference. Vel. av. Was 2960 and ES at 29. 4 shot-.440” and 5 at .637”.
Prior to shooting at 300 yards, I loaded one 350 AeroMax with 91 gr. of 8208 (2915 fps) and fired at 100 yards. Based on its POI, I put four 1/8 clicks of elevation in the scope and and reset the turret to zero.
The above load was now shot at 300 yards with av. vel. at 2916 but ES at 30 (larger than I would like). Still, it managed to keep three shots in .668” and all five in 1.6”
NOTE: when you run the ballistics on a bullet like this at the velocity its traveling, the vertical at 300 yards is under ¼” so that’s why the group size does not really suffer. Now at 5 or 600 yards, vertical would become more apparent!
Group #4: Here I switched to the 325 gr. AeroMax and upped the charge to 93 gr. of 8208. Velocity now went up to 3006 fps with a 38 fps ES……….again, not what I would like? Never the less, thre shots went inot 1.0” and all five in 1.8”. The group also formed in the same location as the 350’s! So, higher velocity but lower BC gave no change in POI with group size only slightly better? With the wind and mirage (we get from shooting from inside the s\heated range to the cold air on the barrel), both groups pretty similar.
Group #5….this time I switched to the 300 gr. AeroMax with the same 93 gr. of 8208 (I would like to take this one up to 94 or 95 gr. in the future) and it produced 3060 fps with a 21 fps ES. With this combination, 3 shots gave me .795”, four in 1.1” and all 5 in 1.7”. As in the above, all impacting in the same area……….higher velocity but lower BC!
These three groups need to be shot again when the weather is warmer and wind is less.
So why the larger ES’s? Good question? The AeroMax bullets all were pretty equal in seating pressure? The Speer, on the other hand, varied some in pressure but if you look at the last two shots in the second group, shots 4 and 5 were identical in velocity! AND, both seated with NO pressure? I put my solid brass ram rod on top of the bullet, “let go,” and it drove the bullet down on the powder………..that loose, and yet the same velocity! Go figure? Those two bullets, while not touching?, were both the two lowest, vertical wise!
Tuesday morning here in western NC brought range temperatures down to 22* with a little variable wind/breeze but skies were clear. The first group #1 was “more or less” to foul the barrel some and again, I using the “cheaper” Speer 300 gr. soft point bullets to “little by little”, get rid of them. Due to some LabRadar issues, the first five of six shots was not captured. I am still working out details, even after speaking with a LR tech on the phone. So, here I am trying to get the right distance of the LR in relation to the barrel/muzzle/brake along with the right settings in the program itself; using the inexpensive bullets, also has its advantages. Even with all the messing around, I was able to get six shots in .926”…………and, then, captured the sixth and remaining 20 shots. This, using a 10/62 duplex of N-110 and N-120.
Sticking with the same duplex, I substituted the 300 gr. Fury Star for the Speer and you can see how the group greatly improved. Was it the fact that the barrel had now been fouled or is it just the change to a better bullet? I tend to feel the Fury made the difference. Vel. av. Was 2960 and ES at 29. 4 shot-.440” and 5 at .637”.
Prior to shooting at 300 yards, I loaded one 350 AeroMax with 91 gr. of 8208 (2915 fps) and fired at 100 yards. Based on its POI, I put four 1/8 clicks of elevation in the scope and and reset the turret to zero.
The above load was now shot at 300 yards with av. vel. at 2916 but ES at 30 (larger than I would like). Still, it managed to keep three shots in .668” and all five in 1.6”
NOTE: when you run the ballistics on a bullet like this at the velocity its traveling, the vertical at 300 yards is under ¼” so that’s why the group size does not really suffer. Now at 5 or 600 yards, vertical would become more apparent!
Group #4: Here I switched to the 325 gr. AeroMax and upped the charge to 93 gr. of 8208. Velocity now went up to 3006 fps with a 38 fps ES……….again, not what I would like? Never the less, thre shots went inot 1.0” and all five in 1.8”. The group also formed in the same location as the 350’s! So, higher velocity but lower BC gave no change in POI with group size only slightly better? With the wind and mirage (we get from shooting from inside the s\heated range to the cold air on the barrel), both groups pretty similar.
Group #5….this time I switched to the 300 gr. AeroMax with the same 93 gr. of 8208 (I would like to take this one up to 94 or 95 gr. in the future) and it produced 3060 fps with a 21 fps ES. With this combination, 3 shots gave me .795”, four in 1.1” and all 5 in 1.7”. As in the above, all impacting in the same area……….higher velocity but lower BC!
These three groups need to be shot again when the weather is warmer and wind is less.
So why the larger ES’s? Good question? The AeroMax bullets all were pretty equal in seating pressure? The Speer, on the other hand, varied some in pressure but if you look at the last two shots in the second group, shots 4 and 5 were identical in velocity! AND, both seated with NO pressure? I put my solid brass ram rod on top of the bullet, “let go,” and it drove the bullet down on the powder………..that loose, and yet the same velocity! Go figure? Those two bullets, while not touching?, were both the two lowest, vertical wise!
