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I have been saving all my .303 brass for many years and started looking around for flat based bullets. The best i can find are the Sierra pro hunter 180 and 150 grain. 180 grain, being pretty similar to the the 174 grain Mk 7 cartridges , I'm assuming i'll be able to recreate them quite well. Does anyone in North America have a recipe for reloading the 150 grain bullets that gives a similar trajectory at least over the first 300 yards or so (so i can use the standard sighting)?
woodleigh also make a 174 gn flat base
Personally I have been pulling Chinese surplus 7.62x54r to get my 150grn .311 flat based bullets. I have had great success with 32grns of 4198 with that bullet (not a formal load from any book, but you will find that load under .30-40 krag), I was just shooting clays with my P14 at 100m no issue with that load (if I missed it was my fault). I have no idea how well it will continue to preform after 100m as I don't have access to a farther range, but it was a very comfortable to shoot load (virtually no recoil) which was much more accurate than the commercial S&B FMJ I had tried before this.
Ok, if you load your Sierra 180 Pro Hunters to 2400fps, and your Sierra 150 Pro Hunters to 2500fps (Both of those velocities are easily attainable with modern Handloads), they will have virtually the same trajectory out to 500yds.
I used a 200yd zero in the calculations, but it doesn't matter what you zero at as far as the trajectory is concerned.
Quote:
Originally Posted by newcastle
Try Hornady 150 grain Flat based soft points very good to 300m and they are .312" I sat the projectile out till the case mouth was just under the cannular bottom ring say 1/64" give them a bit of a crimp to just fold the case mouth a bit to assist it on the feed ramp and to keep the projie in place. I was using 42gns of AR - 2209 with Federal 210 Gold Match primers with RP cases but as usual work up to loads do not just race off and try it drop it by at least 5% try 39.9gns and work from there as each rifle is different keeping an eye out for pressure.