Home Forums Reloading Big Game Rifles .270 Winchester and 140 Partition

58gr of H4831 and 140gr Accubonds are very accurate out of my A-bolt also. I haven't chronographed this load yet but it should be around 2800fps. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />

I have had good success with H4831sc, but the real deal in my 700 CDL is the 140 AB and 60.5 grains of Vihtavuori N-165. This is right at 3K and shoots fantastic. Average of 5 - 3 shot groups is .61" doesn't get much better than that in a bone-stock rifle. Regards, Eagleye.

My Son-in-Law and I just ran a short test of 3 powders for cold weather changes. 160 Accubond in his 7 Mag. 3 cartridges of each powder were loaded, with one of each put into the freezer for 2 hours. Air temp was about 95 degrees, the freezer under zero. The drill was to fire the two air temp. shots 1st and last, with the cold one in between. Each group was fired as about as fast as he could feed another cartridge in and get a sight picture, with time off between groups for cooling. I was walking to the freezer after the cold ones(20 ft. away). All loads were between 2850 and 2900 fps. H4831SC was first up. The cold shot was actually the fastest of the group by a few fps, with the 1st air temp shot being the slowest. Next was RL-22 and then Ramshot Big Game. Both showed over 100 fps slower with the cold shot.
While no attempt was made for tight grouping, with the exception of two holes, all were in the same group of 1 to 1 1/4". The two out of the group were low, one about 3/4", the other about twice that. We didn't keep track of which shot went where, so don't know that the two low shots were from the cold rounds, may of been driver error.
Now this a very limited test, and the temp. difference was extreme, but I believe we'll be loading with H4831 SC. YMMV of course!

You might also test the heat sink effect of having the gun chilled along with the ammunition, as if you've been in the cold outdoors hunting for a while. I think Denton has commented on this.

I'd have to say that the longest shot I would consider would be 400 yards and even then I would only do it if I could lay prone with the bipod or make use of some other kind of solid rest whether it was a backpack or something else. I had been doing all of my hunting with a .35 Whelen and while I love the rifle I wanted something flatter shooting for when I'm hunting deer on farms and powerline and pipeline right of ways.

As for powder selection I've got H-4831 around and a friend is selling his 7 Mag and giving me a pound of H-4831SC. I don't have any R-22 around but I think I might have to look into it. When I first bought the rifle back in October 2005 I got good results with nothing more complicated than Remington 130 grain Core-Lokts and a max load of IMR-4350. That was giving me groups of just a hair under an inch and very close to 3200 fps with the 26" barrel on my Ruger #1B