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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 Hornady Amax and 208gn. BTHP. Also the
210gn. Berger VLD and BT Long Range. VLD bullets shoot best when
touching the lands. For tangent ogive bullets like the 190gn. and
the 200gn sierra allow 10 to 30 thou. jump. Use a projectile with
the highest BC that will be supersonic at 1200yds.
- 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 case neck. If the
throat is too short you will get high pressures and low velocities.
N550 will give the highest velocity, but is affected by heat i.e. do
not leave in the sun or in a hot rifle. 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.
- If the cases have necks that are not uniform
in thickness it will cause bullet run out. They will need turning to
uniform thickness. Use a flash hole deburring tool to make all the
flash holes uniform. 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. and Sierra 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
the author and is contributed as information
exchange. No responsibility is taken for the views
expressed.
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