Re: .375 Cheytac questions
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Augustus</div><div class="ubbcode-body">Peter, now I really have a headache. If I had not made a bone headed mistake by not accounting for the difference in the inclination angle at the two locations I would not be wondering about the cause of the difference in the rate of deterioration in the two rds. I think the answer is that the 338/408 at 3200 fps is able to mask the deviation better than the slower 375/408 shooting the 425 at 2770 fps. The 338 simply has a flatter trajectory and takes care of dumb asses a little better in this particular case. </div></div>
Augustus, I'm looking forward to you getting those 425s humming along, that will probably change the BC a little.
I asked CE to make the 425s in February as I could see from my testing of the 350,375 & 400s that it would be worth the "leap of faith".
My testing has shown that they are nearly "ballistic triplets" by that I mean that as the weight/BC increases the speed decreases proportionately, with the heavier projectles just edging ahead & the 425 seems to do a little better than the 400 in this regard.
My exit twist is 7.8 & seems to be working fine so far but I haven't fired enough 425s at distance to know precisely.
My rifle liked the 400s & have shot sub moa out to 1700.
I'm currently waiting on another reamer to sort out my die issues & haven't fired my 375 for a while now.
As is is smaller than the Cheytac case I'm very happy with performance so far with the 400s leaving at 2920 & the 425s leaving at 2850-60.
We have been waiting reasonable paitently for more Bartlein barrels that were due around last X-mas to chamber with a Cheytac case to get more performance, apparently this issue may be getting close to being sorted......
Once they finally show up we should be able to realise the potential of the CE projectiles