Originally Posted by lazylabs
Following quote from LV
"Now, the Gen IIs have a much less bearing surface and they can be pushed about 249 fps faster than the 300 SMK AND as a bonus they have a much higher BC as indicated by the significant differences in drop we saw"
"the bulletsmith modified the bullets to use some of the aerodynamic design and technology employed on our Submarine launched ICBMs"
I don't really care about subs shooting BM's.... other than bearing surface length was there any jacket/core/tip changes made that will make this a reliable hunting bullet with suitable expansion at lower velocities?
I recieved some gen I test bullets and shot them in my 338/378, with the limited amount of testing I did not find any horrific change in group size, I also did not shoot them at a distance to test drop against the SMK. I am sure everyone would like to have a working 265 but the combative nature of these threads makes it hard...... What alloy is the AL tip? If it was a softer AL maybe it would flatten instead of turn sideways? What has been tested? Have you tried different jacket thicknesses? Just hoping to get back to a technical solution for some lighter 338's!!!!
The differences between the Gen 1 and the Gen IIs are just the geometry of the bullet profile. They will not expand at reduced velocities with reduced gyro stability spin and they are not designed for slow cartridges. When launched at full velocity potential for the cartridge, you will find that they expand very well. With the unaltered design of the jacket, a launch speed of 3000 fps should suffice for proper expansion. For those wishing to launch at slower speeds, then the tip would have to be modified internally to promote expansion at slower muzzle velocities. They will work at reasonable starting velocities...... Just let Mr Henson know at what muzzle velocity you are expecting to shoot them.
The aluminum tips have been tested in various hardnesses. Again, if the launch speed and spin are correct, this bullet will drive right through the target as posted on the various meat tests.
The test conducted by shooting at a significant reduced initial velocity also initiated minimal gyro spin. When the bullet contacted the target, it did not have enough stability to drive through. Had the test been conducted at the yardage that was being simulated, then the results would have been different since the gyro spin would not have decayed to the starting point of the reduced velocity testing.
On the Jackets, we have only tested the current jacket thickness. Again, they expand predictably and reliably when lauched at the proper velocity and spin rate.
On your group sizes, I don't have enough information to be of much help other than the following procedure (which we previously published here and also on the reverse of the bullet invouce sheets) that we use to tune loads:
We went about the load development of these bullets in the same fashion as we have in the past will all the bullets we have tested (ie GS customs, Lost Rivers, Sierras, Noslers, Swifts, Wildcats and Bergers). Specifically, we conduct a pressure test of the selected powder charges at -.030 off the lands and then slowly increase the powder charges until we reach the point that satisfies us and provides good brass life. We call this the -.030 pressure test.
After the pressure testing, we take that EXACT same powder charge and then test it for ACCURACY at -.030, -.040, -.050, -.060, and -.070 off the lands (with Davidson Ogive Tool and micrometer seating dies) and as a side note, we ALWAYS use a mirage shade to minimize mirage influences due to the barrel rejecting heat. So far in the many tests of all of the above bullets, a load or loads have surfaced that would allow the harmonics of the barrel to work in concert with the powder charges, cases, primers, bench equipment and shooter to yield tiny groups.
Note: when we identify a loading, we then shoot it several times to verify the results. Additionally, when a seating depth is identified, we then shoot it again along with bullets seated +.005 and -.005 from the identified seating depth and that will give us the range of the sweet spot so we can load for the center of it vice just the extreme edges. The final loading is tested for accuracy at 400 yards as well during the 400 yard zero process.
If this does not help, call me on my company phone 678-882-6575 and I will be more than willing to help you.