270 reloading

[blackops]

I picked up some Nosler E-Tip 130gr and Hornady GMX's 130gr bullets. Obviously every rifle is different, but anyone have any suggestions? COL lenghts used with positive results would be nice. Putting it through my Winny M70 featherweight pre64 in 270. Below is what I have ready to go.

Nosler E-Tip 130gr 270
Hodgdon H4831SC 56gr
COL-3.21
Case Tri-2.53
Winchester Brass
CCI BR-2 Primers

Hornady GMX 130gr 270
Hodgdon H4831SC 56GR
COL-3.21
Case Trim-2.53
Winchester Brass
CCI BR-2 Primers

 

[falldowngoboom]

This didn't hold true for me, but I heard that copper (gilding material) solids require more of a jump to properly engage the rifling. Barnes recommends trying seating anywhere from 0.03 to 0.07" off the lands.

I've tested a 165g GMX in 30-06 at 0.01, 0.03, 0.05, and 0.07" from the lands and found 0.01 and 0.03" to be about the same with 0.05 and 0.07" turning in horrible accuracy. Not exactly a ringing endorsement, but you may find it different for your gun.

Also, I'd recommend testing a broad range of charge weights with a couple powders you know work well in your gun. If that doesn't work, look to a different grain bullet (or a shorter bullet). I've recently learned that bullets that are less dense (i.e. copper vs. lead) require a faster twist rate to properly stabilize. The same is true for longer bullets. You're obviously shooting non-lead for a reason, so you can't change that, but you can go with a shorter bullet because it needs less twist to properly stabilize.

I've tested over a dozen five-shot groups with the 165g GMX and couldn't find anything that I was satisfied with, but trying just a couple loads under the 150g GMX and I found a 1 MOA load. Whether it's because of the shorter bullet needing less twist, I can't say for sure. But according to the twist rate formulas, it very well could've been the problem. My gun is 1:10 twist, btw.

 

[blackops]

Thanks for the reply. Really appreciate the feedback.

 

[Clark]

I am also hunting with a pre 64 M70 in .270.
I refitted mine with a 22" Pac-Nor 270 barrel.
I load 130 gr Nosler Ballistic tip bullets, that I molly coat, with 50 gr IMR4895, 3.34" OAL, 2885 fps.

I have killed (8) mule deer with this.
The closest was at 329 yards, the furthest at 510 yards.
(2) were bang-flop
(6) ran ~50'

 

[falldowngoboom]

Clark, what kind of accuracy are you getting that lets you shoot out to 500 yards?

 

[Kernel]

Blackops,

A quick Powley analysis of your cartridge combo indicates the ideal powder speed is in the range of 4350 or N150. Your current choice of 4831 is much slower than that. If you’re looking for suggestions, in addition to 4831, a slightly faster powder would be worth trying.

 

[Clark]

falldowngoboom Clark, what kind of accuracy are you getting that lets you shoot out to 500 yards?

I have a ballistic chart from Quickload that is based on being zeroed at 200 yards. That means I need to be 1.5" high at 100 yards.

If I set up my car hood at 100 yards and get it right on 1.5" high, then when I back up to 500 yards the group is all close enough to the point of aim that I know I can hit deer in the forward 1/3 of the body, in a broadside shot.

This year I took 7 shots and killed 5 deer:
1) 350 yard doe broadside with 8mph wind in her face. I aimed straight for the forward 1/3 of the body with no wind compensation. I hit high and in the middle. It was a bang flop liver shot.
2) 400 yard doe broadside with 13 mph wind at her rear. I aimed straight for the forward 1/3 of the body with no wind compensation. It was a clean miss, but she pulled up her head and looked at me.
3) I fired again, at the middle of the body, and hit the very front and low. It was a heart shot, and she ran 50 feet with no heart.
4) 350 yard 1x2 buck broadside with no wind. I shot for the front 1/3 and got both lungs. It was bang flop.
5) 350 yard 13x4 buck broadside with no wind. I shot for the front 1/3 and got both lungs. He rand 50 feet.
6) 510 yard doe broadside with little wind. I shot for the front 1/3. She went down with all 4 feet up in the air. I started walking and did not look for another shot. All I found was hair and blood and the starting point, and a blood trail the faded out. I gave up after a few hours search.
7) 350 yard doe broadside with no wind. I shot for the front 1/3 and hit the brain. I can't tell if it was bang flop or run 50 feet. It was just getting light and my bi pod was not long enough for the shot.

 

[blackops]

kernel, what will the faster burning powders do exactly that would be beneficial?

 

[blackops]

kernal. what will the faster burning powders do that will be beneficial?

 

[Kernel]

what will the faster burning powders do that will be beneficial?

Blackops, allow you to achieve a higher velocity (perhaps). With a too slow powder you will often run out of case volume before you hit a max pressure. You simply can't get enough powder in the case.

There is a relationship between velocity and pressure, and typically, if you don't reach a pressure near max you won't reach a high velocity.

An ideal powder will allow you to reach the max pressure before you run out of case volume. Therefore, there is the potential to achieve a higher velocity.

A powder that’s too fast will peak early, resulting in poor velocity. So, it’s a Goldilocks thing. Finding the powder that’s just right - velocity, pressure, accuracy.

 

[blackops]

kernel, thanks for the help seriously! Weird though I use H4831SC for my sierra matchking 135gr, 3.34 OAL, and with 58gr I’m around 2900fps. I've shot 1/2 groups with it and regularly under 1 inch. I haven't put the GMX's or E-tips through the krono yet though. What do you mean by case volume? Like the open spacing left from the powder and bullet? Also my OAL right now is 3.21 as recommended, how much length do I really have to play with?

 

[shaggy430]

H4831SC is a fine powder for the .270. Don't let anyone tell you any different.

 

[blackops]

Thanks for the advice shaggy. I really like the H4831SC, but can't find any right now. I was under the impression that H4831SC is has a slow burning rate and that itself gives you higher velocity.

 

[James2]

H4831SC is a fine powder for the .270. Don't let anyone tell you any different.

I agree. Also H4831 is probably the most popular powder for the 270. They are very close in performance, but the SC is cut shorter.

I had no luck with faster powders for my rifle. I found the faster powders went into excessive pressure very easily. I think it is because of the small neck of the 270.

 

[blackops]

I agree. Also H4831 is probably the most popular powder for the 270. They are very close in performance, but the SC is cut shorter.

I was under the impression the SC wasn't formed for better performance, but for making measuring a bit easier.

 

[atblis]

RL22 works nicely too in my experience.

 

[ForneyRider]

I use R22 for 130gr Nosler BT and Hornady SST.

Going over 3100fps though.

IMR 4350 should be good for 3000fps.

 

[nastynatesfish]

well I'm not sure about the e tip bullets but I shoot the 130 accubonds and they shoot damn good. I load them with 57gr of reloader 19 and win brass. seated to just touch the rifleing and use cci200 primers. load runs right aroun 3000 in my old savage 10 with a 24 in barrel. as far as solid copper goes they are heavy for their weight. I shoot barnes tts in my 7mm mag and normally I use 154s the barnes are 120s and shoot awesome. I have 140 but haven't worked a load for them yet. barnes tech say that they shoot better the closer to max load you get and its true. I load mine a 68.5 gr and max is 70. again this is in a 7 rem mag