45 Colt & Imr 4756

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bexan

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Since powder has been tough to come by lately, I have been studying Hodgon's reloading data site. I have been able to get a good quantity of Imr 4756 while other powders have been hard to find. I have had good success with working up loads for 9mm, 45acp and 38/357. What eludes me is a good load for 45 Colt. I have had good accuracy with SR 4756 in 45 Colt but find there is a lot of unburned powder. I am using 250 gr cast rnfp in a Ruger Bisley Blackhawk 7.5 bbl and also a Ruger Redhawk 4.2bbl. I think I need a little more pressure to get rid of the unburned powder but the Hogdon data lists 9.0 gr as max for conventional 45 Colt loads. I have tried some of the Ruger/ TC loads with other powders like Ww 296 and Imr 4227 with good results but the higher pressure loads don't list anything for Sr4756. The max load for 9.0gr with Sr4756 and 250 cast is only around 12200 psi, but the Ruger only loads go to substantially higher pressures. The Hogdon's website doesnt list. anything higher for Sr4756. I am not looking for "Come to Jesus" loads but would like to get rid of the unburned powder. Your thoughts......?
 
Winchester large pistol primers are supposed to be for regular and magnum loads. What I have learned about Sr 4756 is that it likes to be crowded. In 9mm, 4.5 grains would not cycle the slide but 4.8 grains burned clean with great accuracy. 45 acp (shorter case) seems to work fine. I think my problem is the large case volume in 45 Colt.
 
I use it in 180gr bullet loads in .40cal. It has worked fine for me there as well. If nothing else works and upping the powder charge is not an option, I think it's worth a try to use a true magnum primer as opposed to the Winchester standard and magnum primer ( nevertheless, I use the Winchesters as well for large pistol loads).
 
Magnum primers do nothing for incomplete powder burning. Mind you, IMR4756 might need 'em. Give Hodgdon a call and ask
IMR and SR 4756 are the same thing. However, you can't use jacketed bullet data with a cast bullet. You'll drive 'em too fast and lead your barrel. Hodgdon's Ruger/TC loads are strictly for jacketed bullets.
 
sunray said:
Magnum primers do nothing for incomplete powder burning. Mind you, IMR4756 might need 'em. Give Hodgdon a call and ask
IMR and SR 4756 are the same thing. However, you can't use jacketed bullet data with a cast bullet. You'll drive 'em too fast and lead your barrel. Hodgdon's Ruger/TC loads are strictly for jacketed bullets.
Click to expand...

Perhaps in your experience, but switching to a small pistol magnum primer solved the matter of unburned powder in my .38 loads with HS-6. Again, maybe it will solve the OPs issue, maybe not.
 
I have observed that the unburned powder issue is more pronounced in the shorter barreled Redhawk than in the 7.5 Blackhawk. Maybe I need to stop trying to use the same load in both guns and accept that a faster powder will work better in the shorter barrel. I loaded up a small batch with Titegroup today and they were much cleaner.
 
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