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moodyholler
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38-55 Hepburn Help needed
Oct 14th, 2009 at 8:12pm
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I was wondering if anyone knew the twist rate of a 38-55 Hepburn. I cannot get an accurate feel for the twist with the tight patch method as there are a couple of rough spots that mess things up. Also, does anyone have a SR4759 load for the 330 grain Lyman bullet? Thanks, moodyholler
  
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Quarter_Bore
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Re: 38-55 Hepburn Help needed
Reply #1 - Oct 14th, 2009 at 8:39pm
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My .38-55 Hepburn has a 16 inch twist and this is what reference books say is correct for a Remington Barrel. You should check the groove diameter of your rifle. Mine is bigger then .380 and I, in fact, shoot .384 bullets through it. I don't have a SR4759 recommended load since I use IMR4227 and a much lighter bullet. Your rifles 16 inch twist should handle the 330 grain bullet OK. The reason I shoot a lighter bullet is that my rifle is quite light and I do not like the extra recoil associated with heavier bullets.
« Last Edit: Oct 14th, 2009 at 8:45pm by Quarter_Bore »  
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moodyholler
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Re: 38-55 Hepburn Help needed
Reply #2 - Oct 15th, 2009 at 8:14pm
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Thanks QB, mine is Ř.382 in the grooves, 30" long, and 1.030 at the muzzle and the breech. Marked on top flat "REMINGTON ARMS CO. ILION, NY. USA". Thanks for your help, moodyholler
  
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moodyholler
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Re: 38-55 Hepburn Help needed
Reply #3 - Oct 21st, 2009 at 7:17pm
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Got to shoot it this evening. No wind, 100 meters, 1.5 wide, but 5 inches tall for 5 shots. What causes vertical stringing? Sights, are Parts Unknown tang, and original Remington Globe front with ball and post. Bullets are 20/1 Lyman 330 grain, with W_W primers, and 50 grains by volume of GOEX cartridge. A .030 wad wasw used also. Thanks, moodyholler
  
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Re: 38-55 Hepburn Help needed
Reply #4 - Oct 21st, 2009 at 7:39pm
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My guess is that you need to use a little more powder, or bigger diameter bullets, but I don't feel safe  advising that without knowing what charge you are using now.
  
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westerner
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Re: 38-55 Hepburn Help needed
Reply #5 - Oct 21st, 2009 at 8:12pm
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Hard fowling in the throat will cause vertical stringing. The batch of GOEX
cartridge I have leaves long stringers of dry flakey fouling in the bore.  

Are you blow tubing? Wiping between shots? Or just swabbing the throat? 

What QB said also. 

                                   Joe. Smiley
« Last Edit: Oct 22nd, 2009 at 1:08am by westerner »  

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moodyholler
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Re: 38-55 Hepburn Help needed
Reply #6 - Oct 21st, 2009 at 9:35pm
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Westerner, blow tubing between shots, QB, I am using 50 grains by volume of GOEX cartridge. Bullets are not tumbling. Grooves mike .382 and bullets mic .380. Thanks, moodyholler
  
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marlinguy
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Re: 38-55 Hepburn Help needed
Reply #7 - Oct 21st, 2009 at 9:52pm
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If your grooves mike .380", then you need at the very least a .382" bullet, but a .383" or .384" would be even better.
  

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Re: 38-55 Hepburn Help needed
Reply #8 - Oct 22nd, 2009 at 3:43am
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Try a softer bullet that will upset into the rifling. Weigh each powder charge on a scale. 

I'm using thin styrofoam wads made from dinner plates in my 33/47 with excellent results. The bullet that gives the tightest groups is .004 smaller than groove diameter. 

It could take you all winter to get the perfect load. What could be more fun!?  Wink


                                                 Joe.
  

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