[db_tanker]

Does anyone have any kinds of loads worked up using this powder?

regardless of bullet weight, I figure definately somthing heavy...mebbe a cast GC'd bullet.

I got some of this stuff because I will be getting a 338 Win Mag in the next few months and am prepping for its arrival and would like to experiment with it some.

D

[SUBMOAS]

You might to change powders. H870 is graet for Magnum rounds.
Also H870 has been discontinued.

[GooseGestapo]

H870 is rather on the slow side for the .270 but will work. It'll be a tad slow and dirty. You'll get best results with the 150gr and heavier bullets.

You'll also be using full case loads with compressed charges.

Like another poster stated, it's been discontinued, however if you like it, you can get the similar WC-860 from Widners, GI-Brass, and others in surplus form. Also, AccurateArms has the slightly slower burning AA8700.

I've not personally used the H870 in the .270, but I've seen the data and some of it looked pretty good.

You'll also need to use a LargeRifle Magnum primer, and you may run into some temperature sensitivity issues.
It's VERY Slow burning.

[db_tanker]

sounds good....


which bullet maker has the heaviest 277 dia bullet?

D

[berettashotgun]

I am hoping you plan on shooting the ammo from a 24-26" barrel.
I loaded up some 270win with 150gr bullets and was blinded from the flash from the boss, but noticed a considerable reduction in unburned powder from a ruger #1. Never chrono'ed those loads, but like the man said, H870 is no more, besides, 4831sc works great in both the 338 and the 270.

[db_tanker]

dang...starting to sound like I will need to make sure there is no dry brush in front of the gun. :) lol

I think its a 22"...I am thinking that this idea is going to be dropped for some RL-19 or 4064.


D

[GooseGestapo]

db,
The Lee #1 manual gives data for the .270 with 130,140,150, 160 and 180gr bullets wtih H870.
130gr start 65.0gr max. 65.0gr 2,840fps (compressed) 43,900cup
140gr start 64.0gr max. 64.0gr 2,792fps " " 43,400cup
150gr start 63.0 max. 63.0 2,769fps " " 43,200cup
160gr start 62.0 max. 62.0 2,660fps " " 42,800cup
180gr start 62.0 max. 62.0 2,543fps " " 45,000cup

As you can see, starting and top (compressed) are the same. You can't get enough powder to reach SAAMI max allowable pressures. The pressues get lower as bullet weight goes up till the 180gr because the bullet length is displacing powder limiting the amout of pressure attainable.

Lee obtained this data from Hodgdon, so there's no need to go there. This data is confirmed by a 1994 annual publication from Hodgdon.

With the 180gr, it is the 3rd fastest powder; H1000 gave 2,614fps with 60.0gr and H4831 gave 2,581fps with 54.0gr.

My best success with the .270wcf is with the 130gr bullets (Sierra or Nosler Ballistic Tip for accuracy), with IMR-4350 at 54.0gr. This gives at or just under 3,000fps with a 22"bbl, and just at or over 3,100fps with a 24"bbl. I saw a single 3,200fps reading from a 26"bbl Ruger #1.
This is a top accuracy load. Most rifles if capable will shoot under MOA with this load. Seat bullets to 3.250"oal

Second best is H4831. Try starting at 58.0gr and work up to max of 61.0gr (usually somewhat compressed). This will get at or over 3,100fps. 58.0gr has given best accuracy and performance. You might try the 58.0 with a magnum primer to see if accuracy is better.

Third was H414. OK at 56.0gr but not as good as either of the above.

Sorry, never messed with the 150gr in the .270. Have always gone for the flat trajectory of the 130gr. It worked well for Jack O'. Me too.

[db_tanker]

GooseGestapo,

Thank you very much for the data, sir.

I think I just might try some, anyway...since it will be such low pressures.

I have my Dewey rod and plenty of patches. :)


Thanks again!

D