Been looking more and more into a covert length barrel for my DTA, to complement my 26", now that there is a hand guard conversion kit. And with SAC spinning up custom DTA barrels the option are there. Biggest thing holding me back is actually finding load data for short barrels....
Here is a quote from SR90 outlining the performance of the 300 and 338 performance with factory ammo:
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sr90</div><div class="ubbcode-body">Guns4570,
We finished up testing different barrel lengths with the 338LM and 300WIN for the covert rifle system:
- The 18" barrels in .338LM got 2630 fps with 300 grain (factory Corbon ammo) down from 2874 fps with 26" tubes.
- The 300 Win got 2826fps with 185 grain Berger (HSM factory ammo) down from 3050 fps with 26" tube.
Temp was 95 deg at approx 5300 ft above sea level. Production barrels on on order and will be several weeks out.
</div></div>
I'm curious how much velocity I could get out of a 208 amax with the 300 win mag in an 18" barrel; 2700fps (based on the above numbers) seems very doable.
Numbers from JBM (alt=0 temp=59F)
@1000y = -319.85" / -9.05 mil / 1501fps / 1041ft-lbs
10mph cross wind = 67.91" / 1.92 mil
That's some really nice ballistics out of a 28" OAL rifle
Here is a quote from SR90 outlining the performance of the 300 and 338 performance with factory ammo:
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sr90</div><div class="ubbcode-body">Guns4570,
We finished up testing different barrel lengths with the 338LM and 300WIN for the covert rifle system:
- The 18" barrels in .338LM got 2630 fps with 300 grain (factory Corbon ammo) down from 2874 fps with 26" tubes.
- The 300 Win got 2826fps with 185 grain Berger (HSM factory ammo) down from 3050 fps with 26" tube.
Temp was 95 deg at approx 5300 ft above sea level. Production barrels on on order and will be several weeks out.
</div></div>
I'm curious how much velocity I could get out of a 208 amax with the 300 win mag in an 18" barrel; 2700fps (based on the above numbers) seems very doable.
Numbers from JBM (alt=0 temp=59F)
@1000y = -319.85" / -9.05 mil / 1501fps / 1041ft-lbs
10mph cross wind = 67.91" / 1.92 mil
That's some really nice ballistics out of a 28" OAL rifle