16.5" P308 Muzzle Velocity with various loads
I dont have a chrono, but looking for velocity of various loads. 147, 168... Anything to help me with some calculations. Thanks
This is with a DPMS LR308, with a 16" barrel, but you should be really close. These are my loads and have been worked up, so make sure you do the same.
Factory loads as follows.
Radway green 147-150 grain. 2630fps
FGGM 168 SMKs. 2525fps
hand loads as follows
150 gr. prvi pulled 30-06 projos, Fed, Win, Hornady cases, CCI LR primers, 44 grains IMR4064, 2600fps
168 gr. SMKs, Fed cases, CCI LR primers, 43 grains IMR4064, 2460fps
175 gr. SMKs, Win cases, CCI LR Primers, 42.5 grains IMR4064, 2400fps
These loads are for accuracy except the 150 grain loading, which was loaded to get the velocity of the Milsurp stuff. It is 2 moa accurate or better though.
The SMK loads are better than 1/2 moa for five shot groups,(don't like three shot groups), unless I throw a flier, which happens more than I would like to admit.
I still have 1/2 to 3/4 grains to play with on the SMKs before I think I will see any pressure signs.
All of these are chronographed 15 feet from the muzzle, at about 85f.
If you go to JBM ballistics, you will be able to get a good trajectory and windage chart. I'm looking at trying the Lapua Scenar 155gr., as it has a very high coefficient and the velocity from that round should be very helpful with this short barrel at longer ranges. I just got off the phone with Sierra, and they have a new palma bullet in 155 out that has a similar coefficient rating as the Lapua, and is priced cheaper.
I hope this helps, and if you have questions, let me know.
Thanks for the info. That helps a lot.