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
Rifles, Reloading, Optics, Equipment
Reloading
Cold Bore Zeroing Process
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="Mikecr" data-source="post: 2300994" data-attributes="member: 1521"><p>I do a lot of cold bore testing, but for more than confirming zero.</p><p>I do it for best cold bore accuracy.</p><p></p><p>So what's the difference?</p><p>Let's say you have a solid 1/2moa hot grouping load. You take your first cold shot at the range and adjust your scope. A 2nd shot confirms. [you would do this off a bipod in the dirt, as you would in the field][I do it at 200 and 300]</p><p>A few hours later, or next day, you try again. How accurate is this shot?</p><p>Over 5 days you shoot a single cold shot each at the same bull, what was the furthest impact from center of mark, over those 5 shots?</p><p></p><p>Whether the gun is expensive or off-the-rack cheap, you might have anything here.</p><p>I've seen competitive level hot bore grouping guns that fared poorly for cold bore accuracy here.</p><p>And I've seen poor hot grouping guns that turned out very cold bore accurate.</p><p></p><p>Sometimes a 'problem' can be the scope. I had a NF NXS scope that caused a lot of excess testing for me. Hot grouped fine, cold bore wandering.. The ONLY way I figured out that it was the scope, was to buy another & swap them ($$$). According to NF, it was a lens bedding issue. They actually fixed it (same scope), 2 day turn around.</p><p></p><p>What I do is adjust powder for this, departing a bit from what was the best hot bore load.</p><p>This is adding a kernel at a time.</p><p>With that, I'll tighten the true cold bore accuracy.</p><p>You can use a 1" shoot-n-see dot at 200yds. Just hit the dot (seems simple), never miss it.</p><p>Same setup at 300yds,, 1" dot. 2" dot at 500.</p><p></p><p>Oh, unless you just want to add to the challenge, avoid 10min shot rate. Terrible..</p><p>Here & there I enter a local accuracy contest. It's a 3/4" dot at 200yds (what led me to this testing). You step up, drop your gun on sand bags, fire one shot, if you hit the bull you move to the next round. It's one bench, and with 50+ shooters it takes pretty much all day for one to win.</p><p>At round 10, we go closest to center & wrap it up. There is normally only a couple still shooting by then.</p><p>What I notice every time is that the late rounds cause ~10min shot rate, and every shooter does worse there.</p><p>Sunlighting has also shifted by then, and that throws shots out (somehow). Slight alcohol factor..</p><p>There is betting, and pig pickens, and booze, oh yeah</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2300994, member: 1521"] I do a lot of cold bore testing, but for more than confirming zero. I do it for best cold bore accuracy. So what's the difference? Let's say you have a solid 1/2moa hot grouping load. You take your first cold shot at the range and adjust your scope. A 2nd shot confirms. [you would do this off a bipod in the dirt, as you would in the field][I do it at 200 and 300] A few hours later, or next day, you try again. How accurate is this shot? Over 5 days you shoot a single cold shot each at the same bull, what was the furthest impact from center of mark, over those 5 shots? Whether the gun is expensive or off-the-rack cheap, you might have anything here. I've seen competitive level hot bore grouping guns that fared poorly for cold bore accuracy here. And I've seen poor hot grouping guns that turned out very cold bore accurate. Sometimes a 'problem' can be the scope. I had a NF NXS scope that caused a lot of excess testing for me. Hot grouped fine, cold bore wandering.. The ONLY way I figured out that it was the scope, was to buy another & swap them ($$$). According to NF, it was a lens bedding issue. They actually fixed it (same scope), 2 day turn around. What I do is adjust powder for this, departing a bit from what was the best hot bore load. This is adding a kernel at a time. With that, I'll tighten the true cold bore accuracy. You can use a 1" shoot-n-see dot at 200yds. Just hit the dot (seems simple), never miss it. Same setup at 300yds,, 1" dot. 2" dot at 500. Oh, unless you just want to add to the challenge, avoid 10min shot rate. Terrible.. Here & there I enter a local accuracy contest. It's a 3/4" dot at 200yds (what led me to this testing). You step up, drop your gun on sand bags, fire one shot, if you hit the bull you move to the next round. It's one bench, and with 50+ shooters it takes pretty much all day for one to win. At round 10, we go closest to center & wrap it up. There is normally only a couple still shooting by then. What I notice every time is that the late rounds cause ~10min shot rate, and every shooter does worse there. Sunlighting has also shifted by then, and that throws shots out (somehow). Slight alcohol factor.. There is betting, and pig pickens, and booze, oh yeah [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Cold Bore Zeroing Process
Top