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- Weigh your cases. Try to have no more than a
one grain spread per batch of 100 cases.
- The best primers are CCI bench rest. They will
give the lowest standard deviation.
- The choice of projectiles is 200gn. Sierra,
210gn. Sierra VLD, 208gn Amax (new) and the 210gn. Berger VLD. The
Berger has the best ballistic coefficient. The quality is poor. They
need to be batched by measurement or else the jump will vary causing
flyers. VLD bullets shoot best when touching the lands. For tangent
ogive bullets like the 190gn. and the 200gn sierra allow 20 to 30
thou. jump.
- The choice of powder is 2208, 2209, N550 or
N150. The choice depends on case capacity. The
Winchester
case has the best capacity. The throat will have to be extended so
the projectiles sit in the correct part of the neck. If the throat
is too short you will get high pressures and low velocities. N550
will give the highest velocity. The powder you choose must fill the
case 100% and not be compressed. 2209 is a good one to start with,
it is very slow and will not create dangerous pressures in a 308.
- Once the rounds are loaded they need to be
checked with a run out gauge. Then check the length from the base to
the ogive. Make sure they are all the same. Then weigh the loaded
round and place in a box so that they can be shot lightest to
heaviest.
- Berger 210gn. bullets need to exceed 2600f/s
muzzle velocity and Sierra 200gn. bullets 2660f/s to be supersonic
at 1200yds.
This item is the opinion of
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