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
22-6mm ack.
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="brianwinzor" data-source="post: 300534" data-attributes="member: 1067"><p>Kirby (Fifty Driver) has identified in his post, the main problems associated with .224 centrefires, heavy bullets, and fast twists. </p><p></p><p>I have been using a 224 Clark for the last 20 years, which is a case that is very similar to the 22/6mmAI. The main difference between the 224 Clark and the 22/6mm AI, is that the Clark uses a 30 degree shoulder, and the 22/6mmAI uses a 40 degree shoulder. </p><p></p><p>The case capacities of the 224 Clark and 22/6mmAI are very similar, and therefore the velocities achieved are also very similar. </p><p></p><p>I have mainly used Winchester 257 Roberts brass, but have also used Remington 257Roberts brass, and found like in many other calibres, the Remington brass had about 1-1.5 grains less capacity. </p><p></p><p>Although I did contemplate using Norma 7x57mm brass, I decided it wasn't worth the extra expense, and also the time associated in the extra necking down steps. I also agree with Kirby in that if you spend several hours on preparation of Winchester (or Remington) brass, the rifle should be capable of delivering excellent accuracy.</p><p></p><p>Regarding barrel life, I fired about 1600 shots in my first 224 Clark before I had the Shilen 10 twist barrel set back, and rechambered to 22/250AI (28). My second 224 Clark (6.5 twist Krieger) had fired about 400 shots when unfortunately it was stolen about 3 months ago. At that stage the distance to the lands had lengthened only about 005 inches, which is negligible. Ken Clark (who developed the 224 Clark) believed that the use of ball powders rather than extruded powders significantly improved barrel life. However, I have not had the time or resources to verify this.</p><p></p><p>Regarding bullets. In my second 224 Clark, the 6.5 twist just disintegrated both the 100 grain Wildcat and 105 grain Little. Even the tough 80 grain Sierra MK came apart. Luckily Garry Little, a local Oz custom bullet maker, came to my aid and produced some 100 - 110 grain bullets which held together and were formed from 257 and 277 cal jackets. However, after some further testing we settled on a 100 grain HPBT bullet with a soldered lead core, that had a similar profile to the Sierra Mk. This bullet had no failures, and I plan to use a similar bullet in my next .224 Clark. </p><p></p><p>I noticed that Berger now also produce an 80 and 90 grain VLD .224 bullet with a thick jacket, which is supposed to help prevent bullet disintegration. I have ordered some and intend to test these to see if they will hold together, but would be interesed to hear from anyone who has already tried them.</p><p></p><p>As a rough guide for your 22/6mmAI, I have listed below some loads from my .224 Clark (1 & 2).</p><p>Rifle 1. Rem 700 SA, Shilen 25.5 inch 10 twist barrel.</p><p>Win cases, Federal 215 primer.</p><p>69 grain Sierra HPBT</p><p>52.0 WW 785 3723</p><p>53.0 WW785 3808</p><p>54.0 WW785 3853</p><p>54.5 WW785 3897 Max </p><p></p><p>54.5 Reloader 22 3869 Max</p><p></p><p>51.0 IMR 7828 3619</p><p>52.0 IMR 7828 3686</p><p>53.0 IMR 7828 3800</p><p>54.0 IMR 7828 3900 Max</p><p></p><p>80 grain Sierra HPBT (naturally didn't stabilise in 10 twist)</p><p>50.0 IMR 7828 3557</p><p>51.0 IMR 7828 3650 Max</p><p></p><p>54.0 Hodgdon 1000 3537</p><p>55.0 Hodgdon 1000 3629</p><p>56.5 Hodgdon 1000 3670 Max</p><p>59.0 Hodgdon 870 3516</p><p>60.0 Hodgdon 870 3596</p><p>61.0 Hodgdon 870 3658 Near Max (sl compressed)</p><p></p><p>Rifle 2: Rem 700 LA, Krieger 26 inch 6.5 twist barrel.</p><p>Win Cases, Rem 9 1/2 M primer.</p><p>100 grain Little HPBT soldered core.</p><p>49.0 ADI 2225(HRetumbo) 2,991 Mild</p><p>50.0 ADI 2225 3,091 Near Maximum</p><p>51.0 ADI 2225 3,144 Maximum</p><p></p><p>53.0 H870 2,975 Mild </p><p>54.0 H870 3,042 Mild </p><p>55.0 H870 3,089 Near Max</p><p>56.0 H870 3,158 Max</p><p></p><p>53.0 AR2218 (H50BMG) 2,963 Mild</p><p>54.0 AR2218 3,014 Mild </p><p>55.0 AR2218 3,053 Mild</p><p>56.0 AR2218 3,101 Near Max, sl compressed.</p><p></p><p>Hope the above is of some help. Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 300534, member: 1067"] Kirby (Fifty Driver) has identified in his post, the main problems associated with .224 centrefires, heavy bullets, and fast twists. I have been using a 224 Clark for the last 20 years, which is a case that is very similar to the 22/6mmAI. The main difference between the 224 Clark and the 22/6mm AI, is that the Clark uses a 30 degree shoulder, and the 22/6mmAI uses a 40 degree shoulder. The case capacities of the 224 Clark and 22/6mmAI are very similar, and therefore the velocities achieved are also very similar. I have mainly used Winchester 257 Roberts brass, but have also used Remington 257Roberts brass, and found like in many other calibres, the Remington brass had about 1-1.5 grains less capacity. Although I did contemplate using Norma 7x57mm brass, I decided it wasn't worth the extra expense, and also the time associated in the extra necking down steps. I also agree with Kirby in that if you spend several hours on preparation of Winchester (or Remington) brass, the rifle should be capable of delivering excellent accuracy. Regarding barrel life, I fired about 1600 shots in my first 224 Clark before I had the Shilen 10 twist barrel set back, and rechambered to 22/250AI (28). My second 224 Clark (6.5 twist Krieger) had fired about 400 shots when unfortunately it was stolen about 3 months ago. At that stage the distance to the lands had lengthened only about 005 inches, which is negligible. Ken Clark (who developed the 224 Clark) believed that the use of ball powders rather than extruded powders significantly improved barrel life. However, I have not had the time or resources to verify this. Regarding bullets. In my second 224 Clark, the 6.5 twist just disintegrated both the 100 grain Wildcat and 105 grain Little. Even the tough 80 grain Sierra MK came apart. Luckily Garry Little, a local Oz custom bullet maker, came to my aid and produced some 100 - 110 grain bullets which held together and were formed from 257 and 277 cal jackets. However, after some further testing we settled on a 100 grain HPBT bullet with a soldered lead core, that had a similar profile to the Sierra Mk. This bullet had no failures, and I plan to use a similar bullet in my next .224 Clark. I noticed that Berger now also produce an 80 and 90 grain VLD .224 bullet with a thick jacket, which is supposed to help prevent bullet disintegration. I have ordered some and intend to test these to see if they will hold together, but would be interesed to hear from anyone who has already tried them. As a rough guide for your 22/6mmAI, I have listed below some loads from my .224 Clark (1 & 2). Rifle 1. Rem 700 SA, Shilen 25.5 inch 10 twist barrel. Win cases, Federal 215 primer. 69 grain Sierra HPBT 52.0 WW 785 3723 53.0 WW785 3808 54.0 WW785 3853 54.5 WW785 3897 Max 54.5 Reloader 22 3869 Max 51.0 IMR 7828 3619 52.0 IMR 7828 3686 53.0 IMR 7828 3800 54.0 IMR 7828 3900 Max 80 grain Sierra HPBT (naturally didn't stabilise in 10 twist) 50.0 IMR 7828 3557 51.0 IMR 7828 3650 Max 54.0 Hodgdon 1000 3537 55.0 Hodgdon 1000 3629 56.5 Hodgdon 1000 3670 Max 59.0 Hodgdon 870 3516 60.0 Hodgdon 870 3596 61.0 Hodgdon 870 3658 Near Max (sl compressed) Rifle 2: Rem 700 LA, Krieger 26 inch 6.5 twist barrel. Win Cases, Rem 9 1/2 M primer. 100 grain Little HPBT soldered core. 49.0 ADI 2225(HRetumbo) 2,991 Mild 50.0 ADI 2225 3,091 Near Maximum 51.0 ADI 2225 3,144 Maximum 53.0 H870 2,975 Mild 54.0 H870 3,042 Mild 55.0 H870 3,089 Near Max 56.0 H870 3,158 Max 53.0 AR2218 (H50BMG) 2,963 Mild 54.0 AR2218 3,014 Mild 55.0 AR2218 3,053 Mild 56.0 AR2218 3,101 Near Max, sl compressed. Hope the above is of some help. Brian. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
22-6mm ack.
Top