Bullet run out how much matters?

[oldroper]

You wouldn't of said that if you knew that Bart B. said Chesty Puller was a Navy cook.

You got lot class talking about combat marine.

 

[INTJ]

But what is acceptable to sierra?

IIRC, 1.1” 10 shot groups at 200 yds from their rail gun type setup. But don’t quote me on that........

 

[Uncle Ed]

You got lot class talking about combat marine.

oldroper

Bart B. is retired Navy, you are a Viet Nam Marine Vet. I was just trying to better relations between a squid and a jar head.

I hope you don't mind having a squid telling you all about the M14 rifle, and how to play with your gun.

 

[Falfan2017]

We were messing around in my shop tonight and thought we would run a concentricity test. Took two pieces of the very same brass that had been neck turned and fired the same amount of times and ran one in the Redding f/l sizer and the other in the lee collet die then ran them on my Sinclair concentricity gauge. Both came out right at .001. The only differents we could see is the Lee is only $30

I got a 30$ hornady fl, whidden and a few Harrels. All seem to produce similar runout numbers lol.

 

[Richard Coody]

quite a discussion.

probably why jamming into the lands is so common in benchrest.

i worked for a solid year learning about concentricity and neck tension and their effect on accuracy. my test bed was a 6br that consistently shot in the 2's.

i found by soft seating in the lands with berger vld's groups were consistent.

i found my best groups by selecting loaded rounds with zero runout and seating pressure consistent within 10#. using 21st century concentricity gauge and 21st century hydro press.

question is is it worth all the effort for .03 to .05 improvement in group size? only you can decide.

 

[dkhunt14]

Question is is it worth all the effort for .03 to .05 improvement in group size? only you can decide.

I believe it is more important in longrange. At 1000 yards you can lose by that .03 or even less. In the last 10 years, things improved and the competition is so tight. I have shot some very bad runout in some sets. I shoot in the lands and it didn't seem to shoot worse. I believe the throat straightens them out. Matt

 

[Ccrider]

That is what I was wondering about. How can the small amount of bullet runout not be straightened after spinning through the barrel?

 

[Richard Coody]

That is what I was wondering about. How can the small amount of bullet runout not be straightened after spinning through the barrel?

my thoughts are if you are jumping a bullet and it hits the throat and rifling at an angle then it will probably imprint into the rifling with the nose of the bullet slightly skewed. how much it effects accuracy can only be seen on the target.

if you are jammed most likely the bullet is squared up on chambering.

 

[Bart B.]

Bart B. is retired Navy, you are a Viet Nam Marine Vet. I was just trying to better relations between a squid and a jar head.

Those relations were great after an incident aboard a battleship. The fleet marine detachment GySgt walked into the CPO quarter's head to relieve himself. The navy CPO next to him finished and started for the exit door.

The Gunny says "Hey, Chief, aren't you gonna wash your hands?" The CPO replied "Don't need to, Gunny. Sailors cannot leave boot camp until they learn how to not pee on their hands.

The Gunny replied with a smile then said "That's good. Let's go to the club next time in port and I'll buy you a couple.

 

[Bart B.]

IIRC, 1.1” 10 shot groups at 200 yds from their rail gun type setup. But don’t quote me on that........

All Sierra match bullets must test inside 1 inch at 200. Used to be 1/2 inch average ES at 200.

 

[oldroper]

oldroper

Bart B. is retired Navy, you are a Viet Nam Marine Vet. I was just trying to better relations between a squid and a jar head.

I hope you don't mind having a squid telling you all about the M14 rifle, and how to play with your gun.

I know about combat, I was with 4th Marines when we landed at Chu Lai. As far as Bart goes he's not combat vet. I really don't find that funny

 

[Bart B.]

As far as Bart goes he's not combat vet.

You're wrong again about me. I was in combat late summer 1968 at South SAR on board a guided missile frigate. While not as classy as forces ashore, 'twas still combat shooting at the enemy airborne forces attacking marines and soldiers on the ground or USN and USAF air crews aloft.

I understand why some jarheads belittle others in different branches of service.

 

[Uncle Ed]

I know about combat, I was with 4th Marines when we landed at Chu Lai. As far as Bart goes he's not combat vet. I really don't find that funny

You should have thought of that when you made your "funny" F. Guffey joke.

 

[Uncle Ed]

You're wrong again about me. I was in combat late summer 1968 at South SAR on board a guided missile frigate. While not as classy as forces ashore, 'twas still combat shooting at the enemy airborne forces attacking marines and soldiers on the ground or USN and USAF air crews aloft.

I understand why some jarheads belittle others in different branches of service.

So that narrows it down a little, you were not a Airedale, so that leaves a Deck ape or a Snipe.

So we now have a Navy test, how many sides does a ship have?

 

[Bart B.]

So that narrows it down a little, you were not a Airedale, so that leaves a Deck ape or a Snipe.

Or one of a few other groups.

So we now have a Navy test, how many sides does a ship have?

Could have up to several dozen or more, depending on context.

Be specific. I smell a trick conjured up by an errant landlubber.

 

[Dusty Stevens]

I for one want to thank all yall for your service

 

[Bart B.]

I for one want to thank all yall for your service

You're welcome. And worth it.

 

[Bojo]

Thankyou all for your service.
Now with that out of the way.
Someone with time and monew needs to machine and glass/plexiglass action , bolt and chamber so what occurs inside can be seen.
I'm out I'm just a dumb wrench.

 

[Bart B.]

Someone with time and monew needs to machine and glass/plexiglass action , bolt and chamber so what occurs inside can be seen.

If you cannot picture in your mind what rifle parts do to position a rimless bottleneck cartridge in the chamber then fire it, cut the barrel off at the chamber mouth then chamber an inert primed case and slowly drive the firing pin home watching the case mouth center in the chamber mouth.

Same thing happens with live ammo. This dispels the myth that such cases rest in the bottom of the chamber when fired. Nor are they held hard against the bolt face.

 

[Uncle Ed]

This dispels the myth that such cases rest in the bottom of the chamber when fired. Nor are they held hard against the bolt face.

A cartridge can just lay in the bottom of the chamber, and this depends on case base diameter, chamber diameter and the type action. And the proof of this is the fired case will expand more on one side. Below the smaller diameter HXP case has expanded more on its left side. And small diameter 45-70 cases would do the same thing in my Ruger No.3 and expand more on one side.

Below is a .303 British Enfield bolt head and it does not support or hold the rear of the case. And the same applies to the Ruger #1 single shot rifles. Also a neck sized case has no head clearance and is held against the bolt face.

And below is a modified No.4 Enfield bolt head for the .223/5.56 cartridge with a recessed bolt face that does support the rear of the case.