#.458 socom subsonic twist rate how to#

Lehigh says 1:10' but Marty at Teppo Jetsu says that a faster 1:8 twist is really required to stabilize the big Leigh bullets. Pre-threaded for Savage would be great, but the ultra-fast twist messes things up for anyone making pre-threaded barrels. I need to locate someone turning reasonable priced custom barrel blanks. I found a source to grind the 458 chamber reamers, throater and headspace gages. Go there and double-click on the pics for bigger pics. They are a bit small here but bigger on the Lehigh site.

#.458 socom subsonic twist rate how to#

I've just figured out how to post pics and don't know how to resize them yet. Shipping via USPS Priorty Mail to the 50 states is included in the price. 458 Subsonic Controlled Fracturing was designed for outstanding terminal subsonic performance for suppressed bolt gun or single shot applications. Range Drop Drop Windage Windage Velocity Mach Energy Time Lead Lead Sectional Density: 0.396 lb/inÂ² Stability at Muzzle: 1.606 Maximum PBR: 139 yd Maximum PBR Zero: 117 yd Temperature: 0.0 Â☏ Pressure: 29.92 in HgĪtmospheric Density: 0.08629 lb/ftÂ³ Speed of Sound: 1051.0 ft/s Zero Height: 0.00 in Zero Offset: 0.00 inīarrel Twist: 10.0 in Twist Direction: Right Sight Height: 1.50 in Sight Offset: 0.00 in Muzzle Velocity: 1050.0 ft/s Distance to Chronograph: 10.0 ft The JBM calculator says stability of 1.6 with 1:10 twist and 2.5 with 1:8 twist at zero deg.īallistic Coefficient: 0.630 G1 Caliber: 0.458 inīullet Weight: 582.0 gr Bullet Length: 2.414 in The required barrel twist rate for stability with a muzzle velocity of 1,050 fps is 1:10. There may also be high velocity applications as well, but at this point testing has not been done. 458 Match Subsonic is a premium match bullet specifically designed for extreme range subsonic applications. There's plenty of other choices in lighter super sonic weights for hunting though. I didn't really find any other bullets I liked for long range sub-sonic use. 458 Socom because it uses a shoulder, and these heavy bullets. All were rimmed or headspaced on the case mouth. 50 variants I found had any shoulder to headspace on. Opinions, questions, experiences and your thoughts are encouraged. If not, I'm pretty sure I can buy the barrels already chambered. I can't find chamber reamers (they're proprietary) but someone has to make a copy. 458 Socom at subsonic velocity? My plan is for a Savage centerfeed Long action with a 16' 1:8 twist barrel. Two bucks a pill but they're a thing of beauty.ĭoes anyone have experience shooting and/or loading the. I'll live with shooting 582gr bullets instead of 750's. Brass and dies are readily available and there's a huge selection of bullets.

But, I did discover that something that fits the bill perfectly already exists, it's just not a.

After a lot of research and discussion, I have come to the conclusion that there's no case easily converted to do what I want. Mostly it would be a range toy used up to 300 meters on reactive steel. I have been looking for a new 'project' and was thinking that I wanted to do a suppressed.