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The Range
Ammo & Reloading
To brush or not to brush
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<blockquote data-quote="swampratt" data-source="post: 3937314" data-attributes="member: 15054"><p>I looked at what many different benchrest shooters do in the brass prep area.</p><p>I read an article where a guy brushed the necks inside with a worn bore brush and 0000 steel wool and also had a plug of that wool in a socket and after trimming and chamfering the case it got ran into that spinning socket to slick it all up.</p><p></p><p>He said accuracy improved.</p><p>I was kind of new to reloading and was searching for any extra edge.</p><p>I did notice the bullets after I seated them would leave a bit of copper colored sparkles of gilding metal around the mouth of the brass sometimes.</p><p></p><p>I found a VLD chamfer helped that out and I decided to brush necks at the same time.</p><p></p><p>What I noticed is no more copper sparklies.</p><p>I also noticed my seating pressures were more consistent.</p><p></p><p>I was measuring Neck ID at the time with my dial calipers inserted into the case.</p><p>I thought HHHMMM If I spin this case while measuring I can feel the surface roughness.</p><p></p><p>SO I felt surface roughness of the case necks after cleaning and they were very rough.</p><p>I decided to brush the neck and feel again and was rewarded with a much smoother feel while spinning the case with my fingers and measuring with the calipers.</p><p></p><p>I thought smoother neck ID should treat my sizing stem much nicer.</p><p></p><p>It did and I then checked neck friction after sizing and then brushed it and checked again.</p><p></p><p>It is an eye opener.</p><p>Along those same thoughts I was expanding pistol cases for cast bullets and noticed that copper colored sparkle stuff after flaring the case mouth.</p><p></p><p>I removed the flaring stem from the die and noticed it had machined lines in it so It got polished to a super chrome finish.</p><p>Slicker than water on ice.</p><p>I no longer got any copper sparkles on my case mouths after flaring.</p><p></p><p>Now I ended up taking a Tavia mini valve spring pressure tester and placing my case with bullet on it and seating the bullet in my press and watch seating forces.</p><p></p><p>I did change the gauge to a smaller numerical scale so I could really see each pound of force needed.</p><p></p><p>I will leave a video for you to watch and you can see how much initial force is exerted and how much force to just continue to seat a bullet and if you watch the entire video you will see one bullet being seated and pressures jumping around.</p><p></p><p>Brush the necks and use a VLD chamfer and eliminate the jumping around and it will also aid in initial starting force.</p><p>Here is the video.</p><p>[MEDIA=youtube]oMgHov3jXjk:462[/MEDIA]</p><p></p><p></p><p>Now i took it even farther and wondered if seating forces really mattered.</p><p>Would different seating forces result in different pull forces once the bullet was in all the way.</p><p></p><p>I drilled a hole sideways through a bullet above where it was in the case and then seated it.</p><p></p><p>I then took a piece of wire and ran through the hole and clamped the base of the case in a vise.</p><p>I took my pressure gauge and ran the wire around it so when i tried to pull the bullet from the case it would compress the anvil in the gauge and give me a reading.</p><p></p><p>I found if it took 80 psi to seat it also took 80 psi to pull and 40 psi to seat took 40 psi to pull.</p><p></p><p>Obsess much? I see it as eliminating every variable that you possibly can and if you miss a target it was the shooter most likely.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3937314, member: 15054"] I looked at what many different benchrest shooters do in the brass prep area. I read an article where a guy brushed the necks inside with a worn bore brush and 0000 steel wool and also had a plug of that wool in a socket and after trimming and chamfering the case it got ran into that spinning socket to slick it all up. He said accuracy improved. I was kind of new to reloading and was searching for any extra edge. I did notice the bullets after I seated them would leave a bit of copper colored sparkles of gilding metal around the mouth of the brass sometimes. I found a VLD chamfer helped that out and I decided to brush necks at the same time. What I noticed is no more copper sparklies. I also noticed my seating pressures were more consistent. I was measuring Neck ID at the time with my dial calipers inserted into the case. I thought HHHMMM If I spin this case while measuring I can feel the surface roughness. SO I felt surface roughness of the case necks after cleaning and they were very rough. I decided to brush the neck and feel again and was rewarded with a much smoother feel while spinning the case with my fingers and measuring with the calipers. I thought smoother neck ID should treat my sizing stem much nicer. It did and I then checked neck friction after sizing and then brushed it and checked again. It is an eye opener. Along those same thoughts I was expanding pistol cases for cast bullets and noticed that copper colored sparkle stuff after flaring the case mouth. I removed the flaring stem from the die and noticed it had machined lines in it so It got polished to a super chrome finish. Slicker than water on ice. I no longer got any copper sparkles on my case mouths after flaring. Now I ended up taking a Tavia mini valve spring pressure tester and placing my case with bullet on it and seating the bullet in my press and watch seating forces. I did change the gauge to a smaller numerical scale so I could really see each pound of force needed. I will leave a video for you to watch and you can see how much initial force is exerted and how much force to just continue to seat a bullet and if you watch the entire video you will see one bullet being seated and pressures jumping around. Brush the necks and use a VLD chamfer and eliminate the jumping around and it will also aid in initial starting force. Here is the video. [MEDIA=youtube]oMgHov3jXjk:462[/MEDIA] Now i took it even farther and wondered if seating forces really mattered. Would different seating forces result in different pull forces once the bullet was in all the way. I drilled a hole sideways through a bullet above where it was in the case and then seated it. I then took a piece of wire and ran through the hole and clamped the base of the case in a vise. I took my pressure gauge and ran the wire around it so when i tried to pull the bullet from the case it would compress the anvil in the gauge and give me a reading. I found if it took 80 psi to seat it also took 80 psi to pull and 40 psi to seat took 40 psi to pull. Obsess much? I see it as eliminating every variable that you possibly can and if you miss a target it was the shooter most likely. [/QUOTE]
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