Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Chatting and General Stuff
General Discussion
Can you guys tell me (clean up language) this guys is trying to say?!?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="J E Custom" data-source="post: 426962" data-attributes="member: 2736"><p>Good advice !!!</p><p></p><p>But this is a discussion web site .so I will attempt to shed a little light on some of these </p><p>statements if I can.</p><p></p><p>First= as cowboy said it is not a problem with light bullets unless you have an extremely</p><p>light barrel contour like a #1 and even then it probably wont have enough effect to worry </p><p>about. most people use heaver barrels and this all but eliminated this phenomena.</p><p></p><p>This does occur in large bore rifles with heavy bullets and light barrels but not as bad as</p><p>the poster made it out to be. It does not straighten the barrel rifling out. In fact the high </p><p>speed film of a tank barrel upon firing only showed about 3 to 4 degrees of rotation with </p><p>a very large projectile.</p><p></p><p>So with proper bedding and barrel diameter this effect can be controled to a point of no real</p><p>effect on accuracy. one of the main reasons that bench rest shooters use heavy barrels is</p><p>stiffness and torque resistance.</p><p></p><p>Fast twist barrels are to stabilize the heaver bullets at the slower velocities they reach. But </p><p>can be problematic if lighter/faster bullet are used because of jacket separation from the </p><p>Inertiaof the bullet when coming in contact with the rifling. This a good place for gain twist rifling.</p><p></p><p>The slower the twist with the same velocity the less chance of this happening but the greater</p><p>chance of not stabilizing the bullet, so the proper twist rate is very important.</p><p></p><p>As to the issue of velocity difference between a 1 in 14 and a 1 in 8 twist = it is no where near </p><p>25% more like 25 to 50 ft/sec at best.</p><p></p><p>Now for the fireing pin issue. </p><p>The main reason for going to a lighter fireing pin is to improve lock time !!!! the reason to </p><p>improve lock time is to make up for inconsistent trigger control by the shooter (The faster </p><p>the ignition process the less time the untrained shooter has to move positions or follow</p><p>through). this is one of the reasons that the well trained and practiced shooters find no</p><p>advantage in them.</p><p></p><p>The heaver spring improves the lock time but it also makes up for the loss of inertia of the</p><p>lighter fireing pin.</p><p></p><p>Also any fireing pin will move the case forward if the head space is improper but it can't "Drive" </p><p>the case beyond the allowable headspace. And if the firing pin protrusion is correct the firing</p><p>pin stop prevents very much of this from happening.</p><p></p><p>Another reason that I use the speed lock springs Is the diameter . they are smaller and will</p><p>normally reduce the drag of a serpent like spring inside of the bolt (The smaller diameter </p><p>spring coils in line and does not touch the inside of the bolt.</p><p></p><p>All of the things he mentioned can cause some problems if combined in the wrong</p><p>combination but most gunsmiths that build accurate rifles know how to avoid these problems </p><p>areas and don't worry about the theory just work around it.</p><p></p><p>This is just my opinion based upon my experiences and is certainly not the last word in these</p><p>areas.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 426962, member: 2736"] Good advice !!! But this is a discussion web site .so I will attempt to shed a little light on some of these statements if I can. First= as cowboy said it is not a problem with light bullets unless you have an extremely light barrel contour like a #1 and even then it probably wont have enough effect to worry about. most people use heaver barrels and this all but eliminated this phenomena. This does occur in large bore rifles with heavy bullets and light barrels but not as bad as the poster made it out to be. It does not straighten the barrel rifling out. In fact the high speed film of a tank barrel upon firing only showed about 3 to 4 degrees of rotation with a very large projectile. So with proper bedding and barrel diameter this effect can be controled to a point of no real effect on accuracy. one of the main reasons that bench rest shooters use heavy barrels is stiffness and torque resistance. Fast twist barrels are to stabilize the heaver bullets at the slower velocities they reach. But can be problematic if lighter/faster bullet are used because of jacket separation from the Inertiaof the bullet when coming in contact with the rifling. This a good place for gain twist rifling. The slower the twist with the same velocity the less chance of this happening but the greater chance of not stabilizing the bullet, so the proper twist rate is very important. As to the issue of velocity difference between a 1 in 14 and a 1 in 8 twist = it is no where near 25% more like 25 to 50 ft/sec at best. Now for the fireing pin issue. The main reason for going to a lighter fireing pin is to improve lock time !!!! the reason to improve lock time is to make up for inconsistent trigger control by the shooter (The faster the ignition process the less time the untrained shooter has to move positions or follow through). this is one of the reasons that the well trained and practiced shooters find no advantage in them. The heaver spring improves the lock time but it also makes up for the loss of inertia of the lighter fireing pin. Also any fireing pin will move the case forward if the head space is improper but it can't "Drive" the case beyond the allowable headspace. And if the firing pin protrusion is correct the firing pin stop prevents very much of this from happening. Another reason that I use the speed lock springs Is the diameter . they are smaller and will normally reduce the drag of a serpent like spring inside of the bolt (The smaller diameter spring coils in line and does not touch the inside of the bolt. All of the things he mentioned can cause some problems if combined in the wrong combination but most gunsmiths that build accurate rifles know how to avoid these problems areas and don't worry about the theory just work around it. This is just my opinion based upon my experiences and is certainly not the last word in these areas. J E CUSTOM [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Chatting and General Stuff
General Discussion
Can you guys tell me (clean up language) this guys is trying to say?!?
Top