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Hot Topic (More than 10 Replies) 375 Winchester Brass (Read 521 times)
RJ-35-40
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Re: 375 Winchester Brass
Reply #15 - yesterday at 8:07pm
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So when you breech seat does the entire bullet get pushed up into the lands with maybe the exception of the base band?

Clearly I have no experience doing this kind of B/Sing 


Skalkaho wrote yesterday at 7:53pm:
I breech seat both guns so doesnt matter.But will shoot the 38-55 fixed...one day,just cant do it all. I dont loading fixed ,I'm getting lazy...LOL.

  
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joelpend
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Re: 375 Winchester Brass
Reply #16 - yesterday at 8:39pm
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What works for me is if you have a throat that allows the first or second grease groove to sit just in front of the case mouth then upon firing the pressure fills the "void" with grease/lube and minimizes lead shaved.

RJ-35-40 wrote yesterday at 12:15pm:
Hi Pete,

Thanks for your post.

RE: Lead Projectiles (relatively soft) 

So, regarding "Short" brass, I was under the impression that if one did not have brass extend ALL the way to the edge of the bevel where the chamber transitions to the leade or freebore that gap would permit the swaging of lead into the gap, ultimately forming or leaving a ring of lead...that either distorts the top of the driving bands or the base. 

???


Skalkaho wrote on Jun 11th, 2026 at 5:04pm:
You should have no problem in the 38-55. I use it in same and a 32-40. the little shortness of case makes no difference.


  
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joelpend
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Re: 375 Winchester Brass
Reply #17 - yesterday at 8:52pm
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I am on a mission to improve accuracy from my 38-55 fixed ammo. What I discovered is the Starline brass consistently has neck wall variation of .001" or greater. This does not sound like much but it causes considerable runout in the loaded round which of course causes dispersion on target. I neck turned my long Starline brass and then sorted it based on runout. I made a straightline Wilson type seater and it appears that my efforts will be successful in getting fixed ammo to shoot close to breech seated ammo. My chamber is throated long and with the CPA camming action I can engrave the bullet into the rifling pretty good and if it is straight ammo it does shoot very well.

Skalkaho wrote yesterday at 7:53pm:
I breech seat both guns so doesnt matter.But will shoot the 38-55 fixed...one day,just cant do it all. I dont loading fixed ,I'm getting lazy...LOL.

  
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bullshop
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Re: 375 Winchester Brass
Reply #18 - yesterday at 10:02pm
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In Dr. Franklin Mann's book "" The Bullets Flight From Muzzle To Target ""  he wrote that he discovered that if a defect was oriented in the chamber at the same position for each shot they would still group well but outside the group made with non defect bullets.  That is why orientation of bullet to case and case to chamber is importent.
With your runout issue dispersion at the target can be minimized by orientation of bullet to case and case to chamber. It was common practice to put an orientation mark in the mold cavity for that purpose. I believe it is still common practice to mark case rims for the same purpose.
  
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joelpend
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Re: 375 Winchester Brass
Reply #19 - Today at 12:47am
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If bullets have considerable yaw in flight it is hard to see how one can expect a good group even if we attempt to orient the bent cartridges when chambering. Mann certainly did a lot of testing though so I could be off in my thinking.

bullshop wrote yesterday at 10:02pm:
In Dr. Franklin Mann's book "" The Bullets Flight From Muzzle To Target ""  he wrote that he discovered that if a defect was oriented in the chamber at the same position for each shot they would still group well but outside the group made with non defect bullets.  That is why orientation of bullet to case and case to chamber is importent.
With your runout issue dispersion at the target can be minimized by orientation of bullet to case and case to chamber. It was common practice to put an orientation mark in the mold cavity for that purpose. I believe it is still common practice to mark case rims for the same purpose.

  
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marlinguy
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Ballards may be weaker,
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Re: 375 Winchester Brass
Reply #20 - Today at 10:28am
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I can see how indexing cases and making sure all your cases are the same brand helps accuracy. But not sure how much you can do with the bullets? You could put a punch mark in your mold to have some point of reference on all bullets cast from the mold, but does that really tell you about any differences or defects inside each bullet? I think you'd have to sort and weigh all your bullets and toss any that are outside very tight tolerances to ensure accuracy, and if you did that there's no reason to worry about indexing bullets.
  
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joelpend
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Re: 375 Winchester Brass
Reply #21 - Today at 10:38am
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With the machining capabilities of our top mold makers I think molds are so good from them it is useless to index bullets. I have predominately BACO molds and the quality is excellent. 

marlinguy wrote Today at 10:28am:
I can see how indexing cases and making sure all your cases are the same brand helps accuracy. But not sure how much you can do with the bullets? You could put a punch mark in your mold to have some point of reference on all bullets cast from the mold, but does that really tell you about any differences or defects inside each bullet? I think you'd have to sort and weigh all your bullets and toss any that are outside very tight tolerances to ensure accuracy, and if you did that there's no reason to worry about indexing bullets.

  
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Skalkaho
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Re: 375 Winchester Brass
Reply #22 - Today at 11:49am
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Just for kicks years back built a 30-30 bench gun with 375 Brass. I turned the necks to get them concentric, even lathe turned off the web a thou or two so all brass exact. Shot very good. How much time you want to put in for your returns......A fixed chamber has the straight shoulder cut on lands to engrave bullet. By using a 1.5 degree throater you just barely cut that straight shoulder to A slight taper...for breech seating OR for fixed also.  For fixed you'll be pushing in the bullet A tad more to engrave , and for breech the bullet will slide in easier. My one 32-40 breech five shots 100 yds 1/2"...fixed it opened up to 3/4" WITH A tapered bullet, the same bullet I breech seated with.  You put the time in and experiment,you get results....
  
May the Bullet Gods be with you.......
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marlinguy
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Re: 375 Winchester Brass
Reply #23 - Today at 11:55am
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joelpend wrote Today at 10:38am:
With the machining capabilities of our top mold makers I think molds are so good from them it is useless to index bullets. I have predominately BACO molds and the quality is excellent. 

marlinguy wrote Today at 10:28am:
I can see how indexing cases and making sure all your cases are the same brand helps accuracy. But not sure how much you can do with the bullets? You could put a punch mark in your mold to have some point of reference on all bullets cast from the mold, but does that really tell you about any differences or defects inside each bullet? I think you'd have to sort and weigh all your bullets and toss any that are outside very tight tolerances to ensure accuracy, and if you did that there's no reason to worry about indexing bullets.



I agree, but for match shooting I still weigh all my bullets and toss out anything that's outside my weight parameters. It's easy to spot bad ones, but even bullets that look perfect can weigh slightly different, and for long range shooting with 500 gr. bullets my parameters are plus or minus .5 grains difference. So 499.5 to 500.5 is what's acceptable to me. For lighter bullets I cut that in half as that range is too wide for a 300 grain bullet for me.
  
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