Re: 6.5x55 load ?
I have not tried any of the 4350s with 140 grain bullets. However I would reccomend working up your load with RL22 and it usually does very well. Some chambers and brass (capacity) will take up to 50 grains of RL22 with 140 grain bullets without pressure, but data manuals always say the max is 46 grains. Start with about 43 grains and this will likely yield a velocity of about 2450-2500 fps and work up from their. You will not see huge velocity gains per .5 grain of powder but they will be consistent until you get to your max load. At max, while you will likely not see pressure signs, your velocity gains will either stop or start to decline. when you stop seeing gains back off .5 grains and call that your max. With this cartridge there is a lot af variance in maximum load, especially with reloader 22. Your most accurate load will almost positively be between 45 and 47 grains from my experience. This has been the case in about 9 different 6.5x55s that I have owned. Now, with the 140 SST you may not get any outstanding velocities but they tend to be accurate. they have a very long bearing surface and tend to have a slightly lower maximum load than other 140 grain BT hunting bullets. Your maximum velocity with about any powder will probably be about 2700 FPS with a 23 inch barrel, anything beyond that should be seen as a gift. On that note with the BC of the 140 SST you should be able to easily kill deer sized game a 500 yards still. If you want to get into the 2800+ velocity range with a 140 I recommend a berger VLD. I have gotten good velocity and accuracy with 140 grain 6.5x55 loads with IMR7828 as well and while I cannot remember the starting load off the top of my head, I don't think you can fit enough in the case to cause an over-pressure situation. 7828 doesn't do that well in a 20 inch barrel because it just burns too slow, you will just have to try it with the 23 inch barrel if you want. In longer barrels it seems to do very well. If you are getting a lot of muzzle flash, try a Federal 215 primer. It will help to get a better burn from the heavier charge in the shorter barrels. I use them with all of my loads in my Steyr and my velocities seem to have improved along with reduced muzzle flash. Of course when you are getting heavy muzzle flash, you are probably not getting the full potential from your powder charge and ES/SD will likely suffer.