Gunsmithing Discuss repairs, modifications, designs, or building firearms here.

Feeding issues

Old 12-10-2021, 03:32 PM
  #1  
Boone & Crockett
Thread Starter
 
bronko22000's Avatar
 
Join Date: Jan 2004
Location: Eastern PA
Posts: 12,554
Default Feeding issues

My 375 winchester cast bullets shoot great but the tip design is causing feeding issues in my Big Bore. I have to "double clutch" them to chamber them.
just for giggles i ground a bit off the edge of the flat point and they fed smoothly. I tried seating them a little deeper but same result. I may see if longer will help by having the tip further up the feed ramp.
Just have to watch i don't go into the rifling
any advice?
bronko22000 is offline  
Old 12-10-2021, 04:12 PM
  #2  
Boone & Crockett
Thread Starter
 
bronko22000's Avatar
 
Join Date: Jan 2004
Location: Eastern PA
Posts: 12,554
Default

Solved my own issue. It was what I thought. The original OAL was too short. So I determined the max cartridge length for my rifle and seated a bullet to .050" less. First check and it chambered nicely. However when put into the tube it was too long and the tip was hanging up in the mag tube and the feed ramp couldn't elevate it. I shortened the OAL another .010" and presto. A smooth feed. No hang ups what so ever. The difference between the cast bullets and the Winchester jacketed bullet is the profile. The cast ones have a larger flat point and a shorter olgive which cause the tip to jam below the entrance to the chamber. Lengthening the OAL allowed the flatter tip to be in line with the chamber for a smooth feed. I wonder how many guys got rid of their 375s for feed issues like this.

Last edited by bronko22000; 12-10-2021 at 06:04 PM.
bronko22000 is offline  
Old 12-10-2021, 07:02 PM
  #3  
Nontypical Buck
 
Nomercy448's Avatar
 
Join Date: Oct 2009
Location: Kansas
Posts: 3,810
Default

I like to think that the type of folks who bought a 375win Big Bores are the same type of folks to have their poop in a group and be able to understand and power through reloading quibbles and quandaries like that.

But then again, I worked on a never fired Big Bore last year (two years now? Idk) which had passed through two collectors and had never - a day in its life - EVER - been able to feed and function properly. The third owner tried to cycle factory ammo through it, and it simply wouldn’t feed smoothly, and would not eject rounds. Upon inspection, the extractor was wedged so tightly into the bolt that it could not move. I had to polish out the channel and the extractor to remove the interference fit, fit the “flat” of the extractor to allow sufficient movement, as well as reprofile the bevel and face to actually land cases on the bevel instead of dead length on the face. Then reblue (which I absolutely, positively &@$#% hate doing) the extractor to the original deep factory black… fed and functioned like a singer sewing machine after that… on dummy rounds… just to go back into the safe… although I do think this owner might be the one to break the ice and finally fire it someday before he’s too old and can’t.
Nomercy448 is offline  
Old 12-11-2021, 06:55 AM
  #4  
Boone & Crockett
Thread Starter
 
bronko22000's Avatar
 
Join Date: Jan 2004
Location: Eastern PA
Posts: 12,554
Default

Originally Posted by Nomercy448 View Post
I like to think that the type of folks who bought a 375win Big Bores are the same type of folks to have their poop in a group and be able to understand and power through reloading quibbles and quandaries like that.

But then again, I worked on a never fired Big Bore last year (two years now? Idk) which had passed through two collectors and had never - a day in its life - EVER - been able to feed and function properly. The third owner tried to cycle factory ammo through it, and it simply wouldn’t feed smoothly, and would not eject rounds. Upon inspection, the extractor was wedged so tightly into the bolt that it could not move. I had to polish out the channel and the extractor to remove the interference fit, fit the “flat” of the extractor to allow sufficient movement, as well as reprofile the bevel and face to actually land cases on the bevel instead of dead length on the face. Then reblue (which I absolutely, positively &@$#% hate doing) the extractor to the original deep factory black… fed and functioned like a singer sewing machine after that… on dummy rounds… just to go back into the safe… although I do think this owner might be the one to break the ice and finally fire it someday before he’s too old and can’t.
I thought I could find an answer to my problem by posting the thread on here. But as I was typing the original post my feeble old brain was churning and I thought "well just maybe its something simple like the overall length (OAL)." So I put a cartridge into my inertia puller and dumped the powder then after determining the max cartridge length for the rifle I reseated the bullet into the case and just played with the rifle/cartridge until it loaded and fed without issues. Fortunately it only took 2 tries to get it right. The first time, when the OAL was too long and it got stuck in the receiver my first thought was oh s**t I have to go to the gunsmith. But looking at it I just put a small screwdriver behind the rim and pushed it into the tube and with my other hand opened the loading gate, removed the screwdriver and it popped right out. Took a guess and seated the bullet deeper and all was well.
Its really funny because when I was young I never wanted to do any work on a gun for fear of damaging it. But now that I'm older I realize that a gun is just metal and wood (or polymer) pieces put together. and with that mindset it is much easier to try and fix it yourself. Its amazing what you can do then. I've been so bold as to even put in new dovetails in a barrel!! LOL
BTW: YOUR MESSAGE BOX IS FULL!!

Last edited by bronko22000; 12-11-2021 at 08:25 AM.
bronko22000 is offline  
Old 12-12-2021, 12:31 PM
  #5  
Nontypical Buck
 
Nomercy448's Avatar
 
Join Date: Oct 2009
Location: Kansas
Posts: 3,810
Default

Sorry Bronc, I just noticed that! Between the ER, doc, and deer camp, I’ve been a little out of it the last 2 weeks. But I cleared some room in my inbox today.
Nomercy448 is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.