IMR4227 in .45 Colt

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IMR4227 in .45 Colt

Postby Santa01 » 26 Nov 2017 18

Howdy again, I have been shooting a 200 gr LRNFP with CCI 300 primers on top of 6.8 to 7.3 gr of Titegroup in both my Cimarron 1873 4 5/8 barrel and my sweet Rossi 92 16". Very easy soft shooting round. I have just bought some IMR4227 and am pondering building a load JUST FOR THE ROSSI, with a cast bullet between the weight of 265 to 300 gr. using this powder. It seems I might have to use the CCI 350 primer instead of my stash of 300s. Oh well,such is life. Just for kicks n giggles (no pun intended) I would like to send these out around 1,500 fps. I know , I am a glutton for punishment but that metal butt plate just looks so friendly. Any suggestions as to hardness, need for gas check, pointers for me to research are ALL appreciated. Thanks guys, Santa01
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Re: IMR4227 in .45 Colt

Postby Ranch Dog » 26 Nov 2017 22

I have H4227, four pounds of it, but have never found much use of it other than my Rossi 2" 38 Spl revolver. I use QuckLoad for all my load predictions and the velocity always significantly lagged as compared to Lil'Gun or H110 both. That performance has been confirmed by the chronograph, so I don't use it for my inventory ammunition.

I load my 45 Colt to 35K PSI with my 290-grain cast bullet and see 1775 FPS with Lil'Gun, 1710 FPS with H110, but only 1495 FPS with H4227.
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Re: IMR4227 in .45 Colt

Postby Ranch Dog » 27 Nov 2017 17

Santa01 wrote:Any suggestions as to hardness, need for gas check, pointers for me to research are ALL appreciated.

I don't think that with a 16" barrel and a 275 to 300-grain bullet, 1500 FPS will be obtainable with 4227. You probably will need to use a compressed load to get around 1425 FPS. In my experience with the powder and lubed cast bullets in general, you are likely looking at a load that is 105% of the usable case capacity with the bullet seated. A lubed cast bullet is tough to seat at any greater compression level; it won't stay in place.

The good thing is that the full load will generate only 26 to 27K PSI, a pressure that a plain base bullet can survive as long as it has a double-digit BHN (vs. a single).

That given, my advice would be to start with a gas checked bullet if you can to eliminate one variable in this process.
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Re: IMR4227 in .45 Colt

Postby Santa01 » 28 Nov 2017 17

Thanks, I have ordered some Beartooth 265 grn gc. Now to get some CCI 350 to replace my 300s for the 4227.
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Re: IMR4227 in .45 Colt

Postby Ohio3Wheels » 29 Nov 2017 10

I've always found that if velocity is the goal, along with accuracy, then either of the 4227s is not the powder of choice. I found that it maxes out before you reach the MV you're looking for. I switched to H110 for the most part in both the 45 Colt and the 357 and those loads will stand for this season. Off season I want to try some lil gun, but that will wait until spring.

Out for armed recon today with the '92.

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