It’s a labradar. Have you shot it or just reading?Your chrono must be way off or something. M80 ball from a 16" is around 2700 FPS.
It’s a labradar. Have you shot it or just reading?Your chrono must be way off or something. M80 ball from a 16" is around 2700 FPS.
Can I ask someone who knows this stuff well about 7mm-08 specifically? Getting one currently at 20” cut and threaded for suppressor. Have asked for 18” from gunsmith, but would 16” make sense if it would always be suppressed and I’m planning to shoot bullets in the 139/140gn size? I don’t currently hand load but have an option to work one up, and it would probably be a 160gn TMK. Also, it’s a 1:9.5” twist. Thx
You’re on to something.Outside of the really big boomers, it seems there would be an ideal intersection of powder burn rate, bore vs powder charge, and barrel length?
Seems like somebody oughta be able to math this out. I.e. stuff that has a bore/capacity ratio of X and best performance with powder Y will do best in barrel length Z.
The .308 works just fine in a short barrel and, while there is overlap in powders, generally uses faster (not slower) burning powders than the 6.5/6mm creedmoore and 243 Winchester.To run heavy for caliber bullets, you would need to run slower burn rate powders to get to a velocity that would keep a 190+ grain bullet to 1800 fps at 440 yards. Nosler shows a max load of 2000 MR getting 2625 fps in a 24" barrel take 200 fps off that for the 8" barrel loss and you are at 2425 which is not much above the minimum requirement to make 1800 fps at 440 yards. The 308 Winchester might not be the right cartridge for the 308 caliber bullets in a short barrel. There may be some powder that would make it work.
Jay
The title of the thread is literally "What caliber (not cartridge) is best for short barreled rifles when shooting heavy bullets?" and I'm discussing heavy for caliber bullets in short barrel rifles.You also appear confounded between larger 'caliper' and heavy for caliper bullet weight. Some people may (or may not) load heavier bullets per caliper with slower burning powder, but this is a different issue entirely.
About 490gr. Speed of sound is temperature and pressure dependent, but assuming 1100fps and going for a mv of 1050 to keep it subsonic through any velocity variations.In Maryland rifle counties, a rifle used to hunt deer must deliver 1,200 ft.lb. at the muzzle. How heavy does a bullet have to be at subsonic velocities to deliver this?
Again, your stated belief that larger caliper bullets use slower burning powders is incorrect.The title of the thread is literally "What caliber (not cartridge) is best for short barreled rifles when shooting heavy bullets?" and I'm discussing heavy for caliber bullets in short barrel rifles.
Calipers are a tool for measurement. Caliber in reference to barrels and bullets describe bullet size and barrel groove diameter.
The 300 BO would never get a 190 grain standard design .308 caliber bullet to a speed that would open effectively. It would not be considered as a .308 caliber cartridge to use a heavy for caliber bullet for hunting at supersonic speeds.
I'm not sure you actually read or comprehend what was posted so I disagree with your assessment as well.
Jay
When in the realm of heavy for caliber bullets, you can use faster burning powders?Again, your stated belief that larger caliper bullets use slower burning powders is incorrect.
.300 blackout was given as an example of the fact that larger caliper bullets indeed use faster burning powders. This is not related to specific concerns regarding expansion velocity.
Slower burning powders are generally used with smaller diameter bullets in a same case and/or in larger cases with the same diameter bullet.