Thread: 16.5 308 Recipe

Anyone got a good recipe for a 308 16.5inch 1:10 shooting 208gr amax? I have always run adi 2208 but been in 24 inch barrel.
I have a lot of 2208 and 2206h, the latter I'm guessing will be better for the short barrel.

Any suggestions appreciated.

I used 46gr load of 2206H behind a 208 Amax in a 24" barrel Omark with good results. It was seated long tho. About 10mm longer than SAAMI spec.

Powder capacity of the case will be a issue if you seat the Amax at SAAMI spec COAL.

Originally Posted by sniper80

I used 46gr load of 2206H behind a 208 Amax in a 24" barrel Omark with good results. It was seated long tho. About 10mm longer than SAAMI spec.

Powder capacity of the case will be a issue if you seat the Amax at SAAMI spec COAL.

Are you sure 2206h?
That load does not look safe

Case capacity and propellant properties may vary considerably from lot to lot!


**** Input data: Date: 31-Jan-2015 Time: 13:12:07
Cartridge................. = .308 Win. (SAAMI)
Projectile type........... = .308, 208, Hornady A-MAX 30712 with boattail


Max.avg.pressure(Piezo SAA)= 62000 psi Shot start / init pressure = 3626 psi
Projectile weight (gr)= 208 Groove caliber (in)= 0.308
Length of cartridge (in)= 2.800 Length of case (in)= 2.014
Case capacity(Grains Water)= 56.00 Length of projectile (in)= 1.340
Length of barrel (in)= 24.000
**** Values calculated:
Seating depth (in)= 0.554 Volume displaced (gn H2O)= 10.05
Comb.chamber volume(gn H2O)= 45.95 Projectile travel (in)= 22.540
**** Input data:
Propellant type........... = ADI AR 2206H
Charge weight..........(gr)= 46.0 Load density......(g/cu.cm)= 0.999
Heat of Explosion (cal/lb)= 439862 Ratio of spec. heats cp/cv = 1.234
Solid density (gr/cu.in)= 409.7 Weighting factor...........= 0.5
Burning rate factor Ba(1/s)= 0.558 Pro-/degressivity factor a = 1.456
Burning limit ......... z1 = 0.4 Combust.Chamber Vb(ft³)= 1.053409E-4
Factor.................. b = 1.544 X-S.Area of Bore A(ft²)= 5.114126E-4
Bulk density (gr/cu.in)= 232.7 Projectile mass mp (lb)= 2.97134E-2
Loading ratio (%)= 108.6 Projectile travel x(ft)= 1.878346E+0


**** Results calculated:
Maximum pressure ........ =90098 psi Way of projectile at Pmax = 1.01 in
Muzzle velocity ......Ve = 2746 fps Muzzle pressure .......Pe = 7400 psi
Project. energy at muzzle = 3483 ft.lbs Fraction of powder burnt = 100 %
Projectile travel time from 10% Pmax to muzzle = 1.07 ms


D A N G E R: Load exceeds Maximum Average Pressure ! DO NOT USE THIS LOAD !
Real maximum of pressure inside barrel.
End of combustion before the projectile passes muzzle.

Originally Posted by Nibblet

Anyone got a good recipe for a 308 16.5inch 1:10 shooting 208gr amax? I have always run adi 2208 but been in 24 inch barrel.I have a lot of 2208 and 2206h, the latter I'm guessing will be better for the short barrel. Any suggestions appreciated.

reloader 17 looks like a good choice around 46gn should get close to 2400fps @ around 58,000 psi -


-------------------------------------------------------------------------------
WARNING: Table produced by not verified Ballistics Calculations! Check results
always against loading data of current reloading manuals! Input data and results
may be invalid or wrong! The use of this data for loading ammunition can cause,
directly or indirectly, serious injury to personnel and material. No responsibi-
lity is implied and THE USER MUST ASSUME THE ENTIRE RISK OF USING THE DATA.
QuickLOAD© V.3.8 Interior BallisticsV.3.8 #535673
© Copyright 1987-2013 - H.Broemel, Babenhausen, Germany
-------------------------------------------------------------------------------
Case capacity and propellant properties may vary considerably from lot to lot!


**** Input data: Date: 31-Jan-2015 Time: 13:20:53
Cartridge................. = .308 Win. (SAAMI)
Projectile type........... = .308, 208, Hornady A-MAX 30712 with boattail


Max.avg.pressure(Piezo SAA)= 62000 psi Shot start / init pressure = 3626 psi
Projectile weight (gr)= 208 Groove caliber (in)= 0.308
Length of cartridge (in)= 2.800 Length of case (in)= 2.014
Case capacity(Grains Water)= 56.00 Length of projectile (in)= 1.340
Length of barrel (in)= 16.500
**** Values calculated:
Seating depth (in)= 0.554 Volume displaced (gn H2O)= 10.06
Comb.chamber volume(gn H2O)= 45.94 Projectile travel (in)= 15.040
**** Input data:
Propellant type........... = Alliant Reloder-17
Charge weight..........(gr)= 46.0 Load density......(g/cu.cm)= 0.999
Heat of Explosion (cal/lb)= 432279 Ratio of spec. heats cp/cv = 1.229
Solid density (gr/cu.in)= 407.2 Weighting factor...........= 0.5
Burning rate factor Ba(1/s)= 0.47 Pro-/degressivity factor a = 0.805
Burning limit ......... z1 = 0.6 Combust.Chamber Vb(ft³)= 1.053292E-4
Factor.................. b = 2.002 X-S.Area of Bore A(ft²)= 5.114101E-4
Bulk density (gr/cu.in)= 244.0 Projectile mass mp (lb)= 2.97134E-2
Loading ratio (%)= 103.6 Projectile travel x(ft)= 1.253346E+0


**** Results calculated:
Maximum pressure ........ = 58091 psi Way of projectile at Pmax = 1.28 in
Muzzle velocity ......Ve = 2360 fps Muzzle pressure .......Pe = 12339 psi
Project. energy at muzzle = 2571 ft.lbs Fraction of powder burnt = 99.4 %
Projectile travel time from 10% Pmax to muzzle = 0.99 ms


WARNING: Near Maximum Average Pressure - tolerances can cause dangerous pressures !
Real maximum of pressure inside barrel.
End of combustion after the projectile passes muzzle.


308.208-re-17 -.txt

Hell, 208s coming out of a 16.5" barrel are going to be slooooow.
I'm going to do 144 to 155gn out of my 16" .308 build.

Why 208? why not 178-168? Run the numbers less than 1400y there is no advantage in the 208 out of 308win... It just cant push it fast enough to take advantage of the extra BC because half of it is taking up case capacity.

I use 44gr ar2208 with 180 gr sst for 2465 fps from 18". +2 at 100 yds 0 at 180 -5.7 at 250.
Good penetration and expansion at this speed. 18" or less is a bush gun and thats plenty for bush work and capable for the odd longer shot when needed.

I run 155gr out of my 16". 208 is useful in a 20" + tube. There is a mega thread on snipers hide regarding 208gr A max in .308.