I bought a box of sierra 150g sgk's this morning to go with my new winchester brass for my .270. The 140's I was previously shooting were with my dads old remington brass that was crap. I couldn't stand it anymore. I figured I would shoot a heavier bullet since I want to take deer out to 700-800 yards with this rifle. I have H-4831sc, retumbo, Rl-22 for powders. Is there really any practical difference between h-4831 and the SC version?? Also, I think I'm going to be using federal 215 mag primer this time around. Good idea or bad?? I want a real accurate load with this bullet. Any suggestions are appreciated.
I never had much luck in the 270 Win with either of the 4831 powders. Just couldn't get the velocities I desired.
I would recommend RL-22 and non-magnum primers. When I switched from 215s to CCI-200s with enough RL-22 to get 3200 fps w/the Hornady 140s the groups went from sub MOA to 1s, 2s and 3s on my good days and right around 1/2 MOA typically.
SGKs shot about as good, as did Nosler ballistic tips. The 130gr bullets are a bit over 3300 fps MV but the 140s seem to do better at at longer ranges. I think they may buck the wind a little better.
FWIW - good luck....
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
I have had best luck with max loads (in my rifle) of H1000 and MagPro with the 140s and 150s. Both powders give me two in the same hole, but the third shot always is a flier about 1/2-3/4" away.
FWIW, 64 gr MagPro with 140 NAB @35F was 2768 fps and 2900 fps at 95F. I would NOT recommend considering this one.
I am in the same dilemma, but I was planning on using H4831sc to get me there. Waiting to actually shoot the ladder for that one. I will also be retesting the H1000 loads. I was using Fed GM210M and WLR primers initially, but I will try the CCI BR2s after I get some better loads worked up.
Whats your loads with h1000? My dad has some, I can use some of his to develop loads. Seems a little on the slow burning side to get the velocity I'm looking for, same as Retumbo. My barrel is only 22", but I'm getting 3050fps with 140's, and I was getting 2925fps with 57.5g h4831sc and 150g btips. Those velocities are what the books getting in a 24" tube, so thats why I was gonna stick with h4831sc. IMR-4350 was on par velocity wise, but was 80fps in deviation, 4831sc was 25fps in max deviation.
You probably won't have the best results with H-1000 in the short barrel. Mag primers usually cause problems in the 270win as well. I have had best results with h4350 in the lighter bullets and h4831 with the heavey ones. Reg, large rifle primers.
I was using 61 gr H1000 with WLR primers. I was using a 2' drop tube to fill the cases. The load is basically a primed case packed full of H1000.
I am shooting a 24" barrel, but I cannot come close to the velocities you are achieving with more powder to boot. With max loads of IMR 4350, 4831, RL 19, RL 22 and MagPro, I could only get to 2808 fps with 150 gr Nosler Partitions. I gave up on the 150s and went back to 140s and 130s. As far as my range allows me to shoot, the 130s and 140s are ballistic twins both of which lap the 150s.