temperature

  1. Near miss

    Rimfire ammo going bad

    Any volunteers willing to test ammo reliability over summer? My idea would be to keep some lot both inside within steady temperatures and in the car. Test: -2x 50 rnd boxes inside your cellar, clothbox -2x 50 rnd boxes inside your car, shed or any other container that is expected to vary in...
  2. doctordoctor

    Temp sensitivity question for 308 powders.

    I am really only familiar with Varget but have recently bought other types of powder to reload and have fun with. When will I really see effects of Temperature? Is there a resource to indicate an optimal operating temperature for the following: 1) XBR 2) 4064 3) Reloader 15 4) BLC-2...
  3. C

    Range Report .308 FGM 168/175 Temperature Effect on MV

    Would anyone like to share their data on muzzle velocity variations for FGM 168/175 due to temp changes? My range time is very limited. I'd like to see what others are observing. For example, my R700 24" 5R with FGM 168 was produced a measured 2575 fps (10 ft from muzzle) at 80 F, station baro...
  4. R

    Reloader 22 - How temp sensitive is it?

    Some time back, I had worked up a load for my 6.5-284 using RL-22, Berger 140 VLD, Federal Match primers, and Norma cases. Rifle is a trued Remington 700 with Pac-Nor barrel. The load was on the stiff side. Finally found some Lapua brass and did another load work-up using the same set of...
  5. R

    ## Water Quench or Air Cool Annealed Brass? ##

    I just ordered an Annealing machine from Giraud Tool Co. GTC Home Apparently I have a 12 week wait before it arrives, so I have plenty of time to work out my question. Doug Giraud admits that there are several theories as to whether freshly annealed brass should drop into water or merely air...
  6. V

    Advanced Marksmanship POI high, temperature?

    Today while shooting, my poi was consistently high, usually a moa or higher from 200-600 m. Not much a temperature change from my last outing and shooting at the same range. There was a drastic difference ar 500 and 600. I checked a ballistics progarm whem I got home and it confirmed my dope...
  7. Powder_Burns

    Advanced Marksmanship Barometric pressure, humidity, temperature?

    Just wondering about how these factors can effect long range trajectories and how they are compensated for. I'd also like to hear someone's take on barrel harmonics and how they mitigate the effects..I haven't seen any octagon barrels or barrel de-resonators in any pics on this site, curious as...
  8. one shot ST

    Adjust muzzle velocity for powder temperature..

    The following has been copied from a tip in the ballistic software Precision shooter workbench 4.. "In general, muzzle velocity will increase with increasing powder temperature and decrease as the powder temperature decreases. The "per degree" change of velocity depends upon a number of...
  9. psinclair

    Range Report cold temperature and high b.c. bullets

    has anyone had problems stabilizing high b.c. bullets in cold temperatures? ive been working with a 6xc and 115 vlds loaded to 2950 to 3000 fps. testing at 5 to 20 degrees f. a friend told i should check into this. i cant get it to group better than 1" at 100 meters. thanks for any input...
  10. Woodlanddude

    Temperature swing Re-15 and 175smk .308

    I have chronied my loads using 43.9 gr Re-15, 210 feds and 175 smks at both 60deg and now just below 30deg F. Loads were tested using a Shooting Chrony Beta Master. Is a drop from about 2635fps to 2565 fps a normal drop in velocity for about 35 deg or so for this combination? Would H-4895...
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