Re: New Hornady .30 cal 225
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: samson</div><div class="ubbcode-body">Having a 30-338Lap Imp built just for the heavies. Seems the bigger cases really start to shine with the heavier pills.
The 208Amax has had such great success, both hunting and paper, that it will probably be my go to bullet unless these 225's prove to be better. But, like I already mentioned, I'm concerned the slight BC edge the 225 has won't be enough to overtake the faster 208Amax.
I'm thinking I'll be able to push the 208 somewhere around 3300 give or take out of a 28in tube. </div></div>
An easy way to bracket when you should shoot the 208s over the 225s is easy to do with JBM. Figure out where the wind drift of the faster MV'd 208 loses to the 225's and just keep that in mind when shooting them.
Case in point:
My 260 shoots 123 Amax's from a gas gun @ 2925, the 140's are much slower at 2700fps. Using that data and an average day around me, I just figured out where the wind drift for a 10mph full value wind was lower for the 140's. There is a time when the 123's are a better choice, but there's about a 18% difference in BC, so it isn't long before the 140's overtake the 123.
My suspicion though is that with the very good BC on the 208's and the advertised BC on the 225's only being about 5% higher than the known BC of the 208 it will be a LOOOOONG way downrange before the 225's have less drift and are retaining more thump than the faster 208s.
The 30-338 LM Imp. is a little heavier duty than the 300 Hulk, Tom Sarver has said that he can push the 208's until they blow up in a 10 twist, a little above 3300fps. He can get the 240 SMK's to 3000, and that bullet has a very long bearing surface, expect to get the 225's a good bit faster than them.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: NTRP-CKA</div><div class="ubbcode-body">It says the BC is .670 on Midway. Is that what your still factoring? Big difference between that and .711 </div></div>
0.711 isn't quite applicable. It's a 2500fps+ G1 only. If you're going to compare average G1's to average G1's then 0.647 (or 0.649?) is what Bryan Litz published on the 240 SMK.
0.670 sounds high for these Hornady's, they were advertised initially at 0.660 if I remember right, and those BC's have a tendency to be about 6-8% high on average in my experience.