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Test: shorten barrel length, barrel shortening for 308 WIN in 2.5 cm steps - energy loss and bullet velocity - silencer
Barrel length: The cartridge 308 WIN | ideal for short barrels, shortened barrel lengths or determination of barrel shortening - test study from the USA - simply calculate energy loss!
The Cartridge 308 Winchester is ideally suited for silencers - reloaders in particular can optimise a lot of performance here
Translate excerpts from the original USA page - English report HERE
Good silencers (SD) unfortunately lengthen the long gun and, in the case of higher silencer weightand also the point of impact by changing the barrel oscillation. Some Overbarrel silencer are also only a compromise - they only create a little more air volume - but no internal construction in the overbarell area.
The best effect is achieved with special SD interior about the Total silencer length achieved. However, if you want to stay SHORT with the gun, this is only possible with a short barrel. The 308 Winchester cartridge is the ideal solution here.
It is designed for short runs, has a Enormous power in relation to the size and as a rule (except for long runs) a Fast-burning powder (very High degree of powder conversion in gas of as good as 100%). One 30-06 with short barrel is probably a pity for the expensive, progressive powder, as too much of it burns outside the barrel (or in the silencer).
Kinetic energy online calculator HERE Calculate flight curve yourself HEREConclusion for the reloader: In practice, this means that Shooting with 308 Win. from short barrels is possible without loss of performance possible. The use of coordinated labours with offensive burning NC powderWith a special bullet weight, adapted bullet weight and powerful primers, short barrels between 420 and 560 mm are possible without any problems.
1. test rifleshooter.com: For the barrel shortening test from 71 cm to 41 cm, the barrel was sawed off by 25 mm after each series of shots
The following equipment was used for the test:
- Remington 700 308 Win short system
- Barrel Shilen .308 1:10 Match Grade stainless steel barrel blank
- TACMOD Chassis
- Badger ZF rail
- Spuhr ISMS ZF AssemblyZF mounts - the most important connection between weapon and optics. Today, gun buyers have a wide range of scope mounts from various manufacturers at their disposal. " More info
- MagnetoSpeed mounted on the barrel for speed measurement (chronograph)
Overview of barrel shortenings - and measured V0 bullet velocities
| Barrel length in cm ⇒ V0 at 308 Win | Winchester 147 grain FMJ - m/s | IMI Samson 150 grain FMJ - m/s | Federal 168 grain Gold Medal - m/s | Winchester 180 grain PP - m/s |
| 71,00 | 904 | 860 | 825 | 802 |
| 68,50 | 903 | 854 | 822 | 795 |
| 66,00 | 901 | 854 | 815 | 792 |
| 63,50 | 889 | 844 | 810 | 788 |
| 61,00 | 887 | 843 | 803 | 778 |
| 58,50 | 877 | 836 | 798 | 778 |
| 56,00 | 865 | 828 | 792 | 770 |
| 53,50 | 856 | 818 | 786 | 764 |
| 51,00 | 855 | 817 | 782 | 755 |
| 48,50 | 840 | 803 | 772 | 744 |
| 46,00 | 835 | 791 | 769 | 735 |
| 43,50 | 825 | 785 | 756 | 732 |
| 41,00 | 817 | 781 | 752 | 723 |
| Averaged, mean V0 loss m/s per 2.5 cm barrel shortening | 7,5 | 6,95 | 6,37 | 6,86 |
2. test rifleshooter.com: For the further barrel shortening test from 38 cm to 20.5 cm, a Remington 700 system was used as a handgun
The following equipment was used for the test:
- Remington 700 308 Win Short System
- Barrel Shilen .308 1:10 Match Grade stainless steel barrel blank
- MDT LSS stock designed as a handgun stock
- Timney 510 trigger
- Harris bipod
- MagnetoSpeed mounted on the barrel for speed measurement (chronograph)
Overview of barrel shortenings - and measured V0 bullet velocities
| Barrel length in cm ⇒ V0 at 308 Win | Winchester 147 grain FMJ - m/s | IMI Samson 150 grain FMJ - m/s | Federal 168 grain Gold Medal - m/s | Winchester 180 grain PP - m/s |
| 38,00 | 797 | 761 | 742 | 714 |
| 35,50 | 780 | 737 | 731 | 702 |
| 33,00 | 767 | 718 | 698 | 679 |
| 30,50 | 738 | 716 | 680 | 671 |
| 28,00 | 714 | 696 | 667 | 652 |
| 25,50 | 689 | 667 | 644 | 632 |
| 23,00 | 667 | 648 | 618 | 603 |
| 20,50 | 631 | 613 | 586 |
Overview of riflescopes for precise shots in the shop
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DDMP V10 4-40×50 riflescope from DDoptics for sport shooting | 1/8 MOA1 MOA (one minute of angle or minute of angle) is 1/60th of a degree of angle. " More info | tac-A
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Interesting test, but unfortunately the dB increase was not measured for each barrel shortening. This is because the loss of speed is accompanied by a considerable increase in volume. However, there are no measurement series on this.
As a result, the question arises as to what extent the silencer reduces the part of the volume that was only created by shortening the barrel to a length suitable for silencers.
Hello Hans - this test was not about the volume - that would be a separate test - the question is whether this is needed, as it would only be about the silencer anyway? Greetings from the DDoptics.Shop team.