March 17, 2014, 08:08 PM | #1 |
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270 win issues?
i loaded a bunch of 90 gr speer tnt hollo points, i loaded 55, 56, 57 and 58 gr of h 380, i shot one shot of each at a target then shot one of each again for consistancy without heat affenting too much, but what should i expect my groups to be? they are under 2 inches at 100 yards, but i feel i should be able to tighten them up alot more
55 gr 1.738 56 gr 2.048 57 gr 2.240 58 gr 2.210 all have a light5 crimp and all are, coal is 3.1699. can i try to brign the projectile out a hare to see if i can engage the rifling so its not jumping from casing to the rifling? or how else can i tighten them up? |
March 17, 2014, 09:04 PM | #2 |
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Personally, I would not crimp them, and I'd probably use a different powder. I used to shoot a 90 grainer in my 270 and used IMR4064 powder. Without my load data, I can't say what groups I got, but I'm quite sure they were an inch or less.
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March 18, 2014, 12:03 AM | #3 |
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I wouldn't crimp. And two shots in a group are about as statistically significant as one shot. Shoot at least ten per group.
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March 18, 2014, 07:48 AM | #4 |
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And the OP didn't say how he did the shooting. From a bench with front and rear bags or shooting offhand in a high wind.
And even though 2 shots aren't statistically significant, two shots that far apart would concern me in my quest for good loads. |
March 18, 2014, 09:04 AM | #5 |
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100 yards, harris bipod off bench, and slight breeze,
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March 18, 2014, 02:49 PM | #6 |
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Ok. Don't crimp and try another powder (R15, IMR4064, H4350) and see what happens.
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March 18, 2014, 03:08 PM | #7 |
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Don't be surprised if that bullet just doesn't want to play nicely.
My family has tried quite a few "varmint" bullets in .270 Winchester (in... 8?) rifles. The Speer 90 gr HP and Sierra 90 gr HP have never worked well for us. The Speer 100 gr "Bucket Mouth" HP, on the other hand, works quite well in most of the rifles, and is exceptionally explosive. Most of us settled on one of the 4895s, IMR4064, or H380 with the 100 gr HPs. However you proceed... I would make sure you have enough bullet seated in the neck, over worrying about the jump to the throat. In the average throat, you're not going to be able to get those bullets touching the lands while maintaining adequate neck tension.
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March 18, 2014, 07:24 PM | #8 |
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H380 is not a powder choice I would use for the 90gr or the 100 gr. My preference of powder for either bullet is IMR-4350. I've re-loaded the 100 gr bullet and have used near the Max amount listed in my manual (Hornady's 3ed.) And found it to be very accurate shot out of my M-700 270. Lets say groupings less than quarter size at 100 was seen. But if H-380 is your only powder for use. I'm sure there is a least one sweet spot with its use. Discovering it may be the challenge.
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March 19, 2014, 01:04 PM | #9 |
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i chose h 380 mainly because ihave a good load for the 243 with it and its availibility localy is good, i do have some hornady 130 grain spbt to experiment with next, i can just plink around with since i just got s remington adl700 in 223 for coyotes so im not as worried about the 270 now. but would like to still know a good mix to use on the 270.
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March 19, 2014, 05:09 PM | #10 |
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For one thing the rifles twist rate is probably not right for that light bullet. The 110 gr would be a better choice with a stiff amount of H4831. I've knocked the legs from under crows with that load.
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March 19, 2014, 08:37 PM | #11 |
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If you really are looking to tighten groups. Get yourself a Dog Gone Good large bench bag. Its designed collapsing as to pinch the rifle between its ears keeps your rifle total stable for ultimate accuracy.
http://www.dog-gone-good.com/ |
March 19, 2014, 08:40 PM | #12 |
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March 20, 2014, 01:04 PM | #13 |
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Another solution is pick up a .223 or a 22/250 for plinking or varmit shooting and forget about trying to use a 270 for something it isn't well suited for. It also gives you an excuse for a new rifle!! Personally I have never tried to shoot anything lighter than 130gr soft point in a .270! BTW if a bullet doesn't have a cannelure the manufacture didn't intend for it to be crimped anyway! William
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March 20, 2014, 11:21 PM | #14 |
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270s can be picky, some not, some very much so.
The bullet is awfully light (not familiar with the 380 power). Its on the low end for the twist and depending on the rifle it can push it over. I don't shoot anything other than 130s and 150s. It took me a while to find a load that the family 270 liked. Not even 4831 which is a good choice, finally was happy with the 4350. More better tends to be 4350 and 4831 and I have a strong bias towards 4350 |
March 20, 2014, 11:54 PM | #15 |
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haha i picke dup a reminton 700 varmit for a plinker/ coyote gun, and i got the 90 gr for practice before i start loading the 130 gr and to see what i could teach myself, and a good woodchuck / coyote round my main thign was pracice settign dies upa nd gettign crimp down without ruign expencive buillets( i paid 8 bucks for 100 of the speer 90 gr tnt) but its mostly a learnign experiance but i want to stay with h380 if possible but goign to load a few 130 gr spbt hornadys i have for deerloads as i think i have the basics down.
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March 20, 2014, 11:57 PM | #16 |
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i also scored a shooting vice for 10 dollars off the local craigslist yesterday, and could i try shooting closer ranges to see what kind of paterning i can do or would i have to stay 100+ yards out to be acurate?
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March 20, 2014, 11:59 PM | #17 | |
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March 21, 2014, 01:22 AM | #18 |
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H380 is way too fast a powder for a case as big-for-bullet-diameter as .270. There is way too much unused space in the case, and the load becomes very location-sensitive. I'm having a bit of a problem with it in a .243 also.
It's time to find a better powder. Your velocity is down, and when you test location-sensitivity, you'll see your accuracy go away, too. Some will tell you that the twist is way wrong, too. That's true, it's not ideal, but you can get consistent groups with too-tight twist. If you can get 1"-1 1/2" groups with those bullets at the velocities possible, you should be rather happy. I agree with the others...IMR 4350, 4320, or 4064 should deliver. Have fun, Gene |
March 21, 2014, 01:29 AM | #19 |
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One-shot groups won't tell you anything. Three-shot groups will give SOME indication of what you seek. A 5-shot group is probably the best indicator of the rifle-load's ability to produce. A 10-shot group will be the most indicative of repeatability, but gets expensive quick, and burns barrels out.
If you are not shooting at 100 yards or a multiple, you have no way to compare with other groups, or shooters. You can always get close enough to get powder burns on the paper, but then what will you be proving? Have fun, Gene |
March 21, 2014, 09:14 AM | #20 |
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i didnt shoot one shot groups i shot 4 shot groups and tried to see how close i could gt them but shot one round at a time at each target with each load. i think i am gonan try the 130's and see if a heavy bullet wil improve if there is any diffrent results.
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March 21, 2014, 09:34 AM | #21 | |
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H4350 is slower than H380 (#115 vs #105 according to Hodgdon) but so much bulkier that you'd probably be hard pressed (literally ) to get enough in the case to be over pressure.
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March 21, 2014, 11:32 AM | #22 |
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IMHO: If you really want to see your rifles best groupings. 130s over 4350. If your trolling for a 130gr loading. A 1/2 gr short of a full Max listing will bring on a smile with the use of 4350. That's a loading I've used in the past and had excellent results with. Using 100 gr bullets 4350 gives the best performance there also.
I don't do 90s. I never witnessed enough accuracy with its use no matter what powder I tried. Besides {if I find it necessary to shoot those light weight bullets 100-gr & lighter} I also have a 25-06 here just for that purpose. H-380 is better suited for cartridges like the 308 and smaller calibers down to the 222-Mag. Those that may benefit with 380s use perhaps would be: 222-mag-22-250-243-6mm-260-7mm-08. If your intentions are to go on using H-380 in your 270 for any bullet weight. You've already posted your best H-380 results with those lighter weight bullets. 130gr isn't going show its potential accuracy either with 380 use. Plain & simple. |
March 21, 2014, 12:50 PM | #23 |
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I shoot a lot of .270win with 110gr Sierra ProHunters with IMR 4064 powder and have had great luck through 5 different rifles. I don't run mine screaming fast either. Roughly 2700-2800fps will do everything just fine.
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March 21, 2014, 11:31 PM | #24 |
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90 gr. TNT's over 4064 gave good groups and velocities from my old model 70. I can tell you that after shooting 20 or 30 rounds I develop a really nice flinch that is a bear to cure.
If you are shooting coyotes or something where a couple three shots in a hunt is normal, then the 270 is fine. For prairie dogs, not so much IMO. |
March 22, 2014, 02:27 PM | #25 |
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I messed around with the 270 with different bullet weights and powders when I first got my 270. In the end the 130 gr bullet and 55 gr IMR 4831 powder is what I settled on. Hard to beat that combo in the 270.
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