Thread: 75gr Amax 223, Ladder test question

Originally Posted by Cyclops

I've never measured the muzzle velocity so can't say.
Electronic targets give an estimate of terminal velocity which can be used to judge consistency of load.

I've used e-target terminal velocity to work back to a muzzle velocity for ballistic calculators - but it is a rough and ready guess to get ballistic calculations to match what we see on the range. My son would say the ballistic calculation or range chart will get you onto the target for your sighting shots, consideration of environmental conditions on the day will get you to the centre.

Maximum safe load for the 80gr A-Max was determined by examining the primers after trying a sequence 24.0 - 24.8 gr 2208 in 0.1 gr steps. 24.8gr was reckoned to be a little hot so we settled on 24.7 gr. This was used for the 75 gr, being a lighter projectile a little more 2208 could be tried if we wanted.

Do you know what the OAL is with the 75gr?
When determining a .005" seating depth was that just something you tried and ended up working, or did you test to find what shot best?
I think I'll probably try a seating depth of .010" off the lands and give that a crack, .010-.015 off seems to be pretty common according to Google.