Re: 416 Barrett vs 408 CheyTac
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: jwoolf</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: steve123</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 6mmFan</div><div class="ubbcode-body">Hey Steve,
I recall that you said that the 375 was hard to dial in during load development. I realize that ballisticly the 375 is marginally better than the 375, but it seems that being less overbore the 408 would be easier to dial in and therefore would also hold better accuracy over a range of conditions than the 375.
Thoughts? </div></div>
It just that it took some time figure out that I needed to seat the 330 Lehighs allot further out to get them to shoot good.They are a hybrid borerider design is why.Different design compared to the Hookers/Jamison 350's. I needed to change to Retumbo for better load density since they are seated out so far.I use the 330 Lehighs out to mile because they are cheaper to shoot.
This shows how much farther I had to seat out the Lehighs.
Today we got 4 hits out of 5 shots at 2105 yards with the 350 Hookers.They do the trick for past a mile.
Steve
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seeing that picture FREAKED me out. I'm at .010 off the lands and you can't see one band outside the case with the 330gr borerider.... I mean, it looks to me like it's 1/8" off from my chambering.
Steve, do you remember the oal of the thing? Mine is at 4.443 at .010 off the lands. I cut a case and since they are solids, I pushed one into the rifle and did it a few times... backed off .010 and called it good at that length.
My LeHigh looks kind of like the other round in the picture you were comparing. You can't see anything at all protruded from the bullet. There is NO WAY your round could could be put in my chamber by even 1/8".
I hate to ask.. fearing they are here but, who chambered your rifle? Did they long throat it on purpose?... it's not even close to mine.
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I sold the rifle and I can't remember what the OACL was with the Lehigh's.
My 375CT was made by Lawton about 5 years ago. The chamber throat was originally cut for the Lost River ballistics 350 grain. I have no idea if Lawton goofed the throating or not??? LRB went out of business right before I got the rifle, wouldn't you know it???
The projectile you see on the right is a 350 grain Hooker. I'm not sure how much the throat had worn at the time of this photo but when I first worked up the load it was around 20 thou off the lands.
At the time I worked up the load for the Lehigh 330 grain, which was a couple years later, the throat was worn forward some. How much I'm not sure. Anyhow, the Lehigh 330 which is the cartridge on the left had to be seated out this far to be just off the lands. It worked out fine being that the rifle was a single shot. I found 2 benefits.
1. I got very high velocities because there was room for more powder.
and 2. I could adjust the run out to nil because the projectile wasn't in the case neck very far.
Here's two 4 shot groups(different seating depths IIRC) on the same plate at 1000Y with the Lehighs at the end of load work up. The other shots were sighters while trying to get centered on the plate. It's interesting to note that the day I shot these groups the wind had come up. A friend, shooting his 6mmbr at 600Y had a hard time hitting a 12" plate. By comparison it's amazing how little the 375CT was affected at 1000Y. Both he and I were astonished.
