- Location
- Calgary, AB
Have you tried seating to Nosler's load data OAL? Also, try H4831 instead. You might be surprised at the results.
Confused about my 270 Win Reloads
- Thread starter mosinmaster
- Start date
The Nosler reloading data is extremely reliable. When I load Nosler bullets, I always use a powder they have tried. Quite often I use the most accurate powder they have and the most accurate load with their COL. It always works in my Sako A7 and makes load development much easier and faster. In this case I would not use IMR4831. H4350 and H4831sc work great with win 270 150 grain. 54.5 grain H4831sc with NP gives me 0.65 groups at 100 yards all day long with a mv of about 2800 fps.
Nosler reloading data give a max of 53.5 grain of IMR 4831 for 140 grain and 52 grain for 160 grain. No data for 150 grain. So if we want to estimate the max load for 150 grain it should be around 52.5-53. You seem to have be higher than max load. If you want to use IMR4831, you probably could start at 49 grain and go up slowly. It might work. H4831sc will always work though.
Nosler reloading data give a max of 53.5 grain of IMR 4831 for 140 grain and 52 grain for 160 grain. No data for 150 grain. So if we want to estimate the max load for 150 grain it should be around 52.5-53. You seem to have be higher than max load. If you want to use IMR4831, you probably could start at 49 grain and go up slowly. It might work. H4831sc will always work though.
Last edited:
nowarningshot
CGN Ultra frequent flyer
One last thought. If its the arrow, its the arrow. Maybe you have a inaccurate barrel. Perhaps you have not come upon the right powder and bullet combo. To put your load in perspective, there is some debate if its 60 or 62gr; however, Jack O'connor's pet load was 62gr 4831 behind a 130 partition. That should shoot. If not, buy a box of match factory ammo. If its still not shooting, that confirms, its not the indian....its the arrow.
- Location
- Calgary, AB
I'm currently using 59grs H4831 with a 130 AB in my M70. I would try either the 130gr BT or AB along with H4831 and start at the recommended OAL and see how it shoots.
Can you guys help me figure out my next step? All reloads are 3.405" COAL for my rifle, just off the lands.
May 1, 2019 I loaded FL sized brass IMR 4831 53.5gr, 54.0gr, and 54.5gr. I got 0.81" (53.5gr), 1.76" (54.0gr), and 2.73" (54.5gr) at 100 meters.
Ok, so I try my uncle's RCBS NS die with the two most accurate loads 53.5gr and 54.0gr and shoot groups on Aug 2, 2019. Accuracy opens up at 100 meters with both loads: 1.42" (53.5gr) and 2.71" (54.0gr). At 200 meters the 53.5gr opens up to 2-4".
I was confused and wanted to try NS with a Lee Collet Die to see if there was better performance, so I loaded up 53.5gr and shot at 100 and 200 meters today, Aug 23, 2019. Even worse accuracy, and it may be due to my unfamiliarity using the Lee Collet die. I also reloaded a batch of FL sized 53.5gr and it shot as great or better than the first loading in May.
Lee Collet Die 53.5gr 2.95" @ 100m
Lee Collet Die 53.5gr 3.72" @ 200m
Lee FL Size 53.5gr 0.79" @ 100m with 1 flyer.
So at this point I have two options. I can adjust the powder charge if NS. I've read that a fire-formed case may have increased velocity with the same weight of powder, and decreasing the powder charge may help improve accuracy. Should I try loading the NS brass at 53.0gr (1/2 a grain less) and see if the groups shrink back down to sub-MOA? At this point, I need a load for hunting season and I'm going to settle on FL sized 53.5gr and raise the elevation a bit to zero at 200m for whitetail/mule deer this Fall.
Any further suggestions?
How is your bedding? Erratic grouping apart from your handloads could also indicate a bedding issue, make sure your rifle is tuned first before any load experimentation.
I find the same. Shooting Model 70 Winchester 270.
Ghys_T3LSS
CGN Regular
- Location
- Sherbrooke, QC
Just my 2 cent.
Measure your brass before and after FL resize. In my 2 varmint rifles (2 Tikkas), I have 0,002’’ difference. I don’t see any reason why In the world I would bother to Neck size, and risk having troubles. Rounds hard to chamber, need a FL anyways after 4-5 reloads, etc. I full length only, bottom the press up. If I ever want to reduce the sizing, I think I would rather use REDDING competition Shellholders instead of going NS.
There are good threads here about FL vs NS. Some of the best shooters in America are full length resizing for consistency.
Maybe I am wrong, but if you get 2’’ groups, it can’t be only because of seating depth or neck turning or concentricity. I would look into bullet choice, charge (ballpark, not fine tuning...), powder type.
Again, just my opinion.
Measure your brass before and after FL resize. In my 2 varmint rifles (2 Tikkas), I have 0,002’’ difference. I don’t see any reason why In the world I would bother to Neck size, and risk having troubles. Rounds hard to chamber, need a FL anyways after 4-5 reloads, etc. I full length only, bottom the press up. If I ever want to reduce the sizing, I think I would rather use REDDING competition Shellholders instead of going NS.
There are good threads here about FL vs NS. Some of the best shooters in America are full length resizing for consistency.
Maybe I am wrong, but if you get 2’’ groups, it can’t be only because of seating depth or neck turning or concentricity. I would look into bullet choice, charge (ballpark, not fine tuning...), powder type.
Again, just my opinion.
Ghys_T3LSS
CGN Regular
- Location
- Sherbrooke, QC
If you are referring to my quote about Redding Shellholders: they make them in 0.002’’ increments. That means if you want to reduce your full sizing let’s say from 0.010 «#clearance#» to 0,002, to increase brass life and/or get better accuracy, you use the 0,008’’ shell holder. You can google it. It’s pretty well explained
Copper fouling remover CR-10. After 50 rounds during load development. Carbon removed after 10 rounds.
Moose, bear, deer and coyote have fallen to the 130 grain NBT(yellow tip). 45 grains of IMR4064 under a NBT 130 grain bullet. Recipe found in Hornady book.
Moose, bear, deer and coyote have fallen to the 130 grain NBT(yellow tip). 45 grains of IMR4064 under a NBT 130 grain bullet. Recipe found in Hornady book.
I too use 270win. I bump my case shoulder back 2-2.5 thousandth of a inch.
I used a lee shell holder with RCBS die, it did not resize my brass. FYI, factory Hornady case has 0.002'' bigger headspace than my chamber, you might want to measure headspace first.
I don't like to drown my barrel in chemicals unless I absolutely have to, some barrel shots better dirty. try to play with bullet seating depth first, my 5 round group shrink to 0.75 MOA just by playing with seating depth. make sure the bullet is seated in the neck at least 1.5 times the diameter, for good concentricity.
only worry about things that are measurable, don't read tea leafs. headspace gauge, concentricity gauge, chronograph are very useful, it could save you money in the long run, or make friend with a serious reloader.
