Ben
01-28-2013, 08:28 PM
In an earlier post, I talked about shooting a heavy 250 gr. gas checked .35 cal. bullet in my .357 Mag. Handi Rifle , see original post here :
http://castboolits.gunloads.com/showthread.php?180942-357-Handi-Rifle
I fired 6 rounds today. I forgot that I had fired about 30 rounds of jacketed ammo in the rifle earlier, I was running a bit behind schedule and really didn't have time to clean the bore of copper before going to the range today.
A few people were concerned that the twist in the barrel might not stabilize the heavy, long, 250 gr. bullet. Well, today the loads seemed to shoot just fine !
The 1st two rounds fired were " wild ", once the bore got coated with lube again, the rifle settled down and shot just fine. ( 4 rounds in a ragged hole ) I may be onto something ? ? ?
I was worried about high pressure......Well, it seems that my 13.0 grs. of IMR - 4227 may not be developing enough pressure. It certainly isn't too much powder. I doubt that I can get anymore 4227 in the case, so I may need to move onto a slightly quicker burn rate powder ?
Here is the test target. 6 rounds , NEI 250 gr. G/C cast bullet with .014 " thickness .35 cal. aluminum gas check. CCI - 400 rifle primers, bullets sized .358"
Maybe I need to move onto something quicker like 2400 powder ?
Here is the load :
http://img.photobucket.com/albums/v494/haysb/002-46_zps108ab23f.jpg
The group below was fired with my Handi Rifle , 357 Mag.
with the load described above. 6 rounds fired at 50 yards from a sand bag rest :
http://img.photobucket.com/albums/v494/haysb/Photo0914_zpseb8de7f7.jpg
You can easily see ( excuse the poor cell phone photo ) that I don't have a pressure problem by looking at the rounded outside edges of the primers :
http://img.photobucket.com/albums/v494/haysb/Photo0913_zps23b37f90.jpg
These sooted cases tell me the 13.0 gr. charge of IMR 4227 isn't building up enough pressure to seal off the cases in the chamber of the rifle :
http://img.photobucket.com/albums/v494/haysb/Photo0911_zps0e80aa8d.jpg
http://img.photobucket.com/albums/v494/haysb/Photo0910_zps303f468e.jpg
http://castboolits.gunloads.com/showthread.php?180942-357-Handi-Rifle
I fired 6 rounds today. I forgot that I had fired about 30 rounds of jacketed ammo in the rifle earlier, I was running a bit behind schedule and really didn't have time to clean the bore of copper before going to the range today.
A few people were concerned that the twist in the barrel might not stabilize the heavy, long, 250 gr. bullet. Well, today the loads seemed to shoot just fine !
The 1st two rounds fired were " wild ", once the bore got coated with lube again, the rifle settled down and shot just fine. ( 4 rounds in a ragged hole ) I may be onto something ? ? ?
I was worried about high pressure......Well, it seems that my 13.0 grs. of IMR - 4227 may not be developing enough pressure. It certainly isn't too much powder. I doubt that I can get anymore 4227 in the case, so I may need to move onto a slightly quicker burn rate powder ?
Here is the test target. 6 rounds , NEI 250 gr. G/C cast bullet with .014 " thickness .35 cal. aluminum gas check. CCI - 400 rifle primers, bullets sized .358"
Maybe I need to move onto something quicker like 2400 powder ?
Here is the load :
http://img.photobucket.com/albums/v494/haysb/002-46_zps108ab23f.jpg
The group below was fired with my Handi Rifle , 357 Mag.
with the load described above. 6 rounds fired at 50 yards from a sand bag rest :
http://img.photobucket.com/albums/v494/haysb/Photo0914_zpseb8de7f7.jpg
You can easily see ( excuse the poor cell phone photo ) that I don't have a pressure problem by looking at the rounded outside edges of the primers :
http://img.photobucket.com/albums/v494/haysb/Photo0913_zps23b37f90.jpg
These sooted cases tell me the 13.0 gr. charge of IMR 4227 isn't building up enough pressure to seal off the cases in the chamber of the rifle :
http://img.photobucket.com/albums/v494/haysb/Photo0911_zps0e80aa8d.jpg
http://img.photobucket.com/albums/v494/haysb/Photo0910_zps303f468e.jpg