IMR 4227 = Questions

[robertbank]

I have been trying to develop loads in my 7.62.39 using this powder as a substitute for 2400 with very little sucess. Aside from decent results in my .303 Brit. the powder just doesn;t produce consistent results. Exteme Spreads over my Chrony are often triple digit and SD's mid double digit. I am using the Lee 312-155 bullet GC'd.

What has been your experience?

Take Care

Bob

[felix]

Bob, some combinations just don't work even though you'd thunked it out just right. Nothing wrong with the burn speed itself, which makes the ignition parameters totally suspect. Not much you can do about it except change primers. For experimentation, get a holt' of some cases with the alternate primer size than what you currently have. ... felix

[robertbank]

Might try LRP - Magnum primers and reduce the load a bit. Thanks for the suggestion. Right now I am using Win LRP.

Take Care

Bob

[Jon K]

If you want to stay in the powder burn rate of 4227, try some 5744, 150 gr works good in a pistol. More speed or bigger boolit try Varget.

Jon

[longbow]

I can't comment on chronographed velocities as I haven't checked but I have found IMR 4227 to be a good performer in my .303, .308 and .44 mag (rifle). I haven't loaded small bottle neck cases though. I use mild loads in the bottleneck cases though.

What load are you using?

Longbow

[robertbank]

I have tried two loads 17 and 18 gr under the Lee 312 155 bullet. OAL 2.151, Win LRP. Going to try three varieties of magnum primers to see if that helps.

Powder works fine in my .303 Brit under the 314299 bullet.
Not so hot in my .308 M 14. What loads have you used in the .308?

Take Care

Bob

[longbow]

So far I have found that from about 18 to 22 grs. works with a 31141 (170 gr.) in my .308 and under a 314299 in my .303.

I'm wondering if your pressure might be on the high side with such a small cartridge - maybe a bit of gas cutting or distortion? You must have pretty much a full case with 18 grs don't you?

I found I had a lot of trouble when first loading for my .308 and had lots of gas cutting even with a gas check. The boolit may have been just a touch undersized but it was shot as cast with a gas check. Recovered boolits were all showing gas cutting and poor accuracy. A moderate load of IMR 4227 seemed to be the answer and I think I was just runnig pressures a little high for the alloy with the other powders and maybe the fit was a lttle marginal.

A good look with a magnifying glass will tell you if you have gas cutting. Winter is a good time to recover boolits out of deep snow too. I was recoveing mine from snowbanks in Kemano not far from you.

Longbow

[stillhunter]

Robertbank, 4227 is a staple in light to medium charges in 303, 3030, 3040, 3006, and 4570, ie medium to large cases loaded with regular primers. I would suspect that your 7.62x39 is a bit on the small size volumewise for the 4227 burning curve. I assume that you are not using magnum primers. Go to another powder.

[NSP64]

I too tried 4227 in 7x39 and couldn't get sks to cycle, switched over to IMR4895 works good in 22 gr range.

[NSP64]

try some 5744, 150 gr works good in a pistol. Jon

150 gr?????? what pistol you shootin

[robertbank]

Hi

17 to 17.5 gr of 4227 works well in my SKS under the Lee 312155 bullet. No signs of pressure. Gun cycles fine with brass falling at my feet. Will be doing some 100 yd testing when I get back home next week. Will report results.

Take Care

Bob

[runfiverun]

see if your problems are when the chamber is hot.
i have heard 4227 gets a bit squirrely under higher temps.

[robertbank]

Well the weather up here has turned decent so I spent the day at the range yesterday. I managed groups of five at 50 yards at 1" with the occasional flyer (me methinks!).

At 100 yards the open sights did me in as all I could do is keep them within a 8" paper plate. I was using 17.5 gr of 4227.

I an going to switch back to WC735, where I had decent results. Brass sails into never never land but maybe the price I have to pay to get the results I want.

Take Care

Bob

[KCSO]

I have had limited sucess with IMR 4227 IF i use magnum primers. You will still get an occasional flyer but the magnum primers do help.

[robertbank]

Thanks for the tip. I'll run the magnum primers to see if they improve the results.

Take Care

Bob

[Larry Gibson]

I find H4227 to be "the" powder for use with 123-125 J bullets in the 7.6x39 cartridge. But like you I had limited success with it using the Lee 155 gr bullet. As mentioned by others I also found 4895 to be the best choice for that bullet and the Lee 312-185 in the 7.62x39 with both the SKS/AK and my little Mini MKX Mauser.

Larry Gibson

[Jon K]

NSP64,

That would be a Merrill (aka XL) 7.62X39 16-18 gr 5744/Fed 210/150 gr Saeco#316 or 311014, or 311291.

Also workd good in a 30 Herrett- T/C or Merrill, and that combination also works very well in a 30 Merrill.

Jon

[NSP64]

Jon K,
Was just wondering, sounded like 150gr of powder.:kidding:

[jcwit]

I tried IMR 4227 with no luck switched to SR 4759--end of problem.

[leadman]

Has anyone used WC680 with cast boolits in the 7.62x39?

[kjg]

this just proves the fact that evry single rifle or handgun has its own likes and dislikes on what they favoer to be shot .kjg