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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Caliber and Barrel Length for New PD Barrel
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<blockquote data-quote="brianwinzor" data-source="post: 63321" data-attributes="member: 1067"><p>Fifty, Terrific group with the 80 grain Bergers, and interested to see that you had to jam them .020 into the lands to get it. </p><p></p><p>Previously I have tried seating as far as .010 into the lands, but never went further as I wanted to avoid the nightmare of having a chamber full of powder if I didn't fire the shot and had to eject. </p><p></p><p>My last .224 Clark only had about .002 of bullet tension, and with case variation, the above "nightmare" occured until I became better at detecting the cases with less tension. (I full length sized those cases, which gave me .004 of tension)</p><p></p><p>I note that you are achieving near maximum/maximum pressure at 49.0 grains Reloader 22 and a velocity of 3,590 fps. This load would have been about 3.0 - 3.5 grains less than what I used in my last .224 Clark with similar bullet weight, and seems to be another instance of the 22/6mm with 40 degree shoulder consuming less powder than the 22/257 with 30 degree shoulder. </p><p></p><p>Usually a case with 40 degree shoulder has a slightly larger capacity than one with a 30 degree shoulder. My current 22/250 AI (some call it RCBS) with 28 degree shoulder is an example of that. </p><p></p><p>Richard Graves emailed 10 days ago to let me know that my order of 80 and 85 grain ULD .224 bullets (and 130 &amp; 142 257's) had been sent by "snail mail" as it would have cost over $C90.00 to send them airmail. </p><p></p><p>He said that 85 grains was the heaviest ULD that this .224 jackets and dies would make, and asked if I was interested in some 90 &amp; 100 grain 10 ogive flat base bullets. (I said yes)</p><p></p><p>Now that I know the bullets are on the way, I will order the barrel, and had intended to order a Krieger 26 inch 1 in 7 twist in number 3 profile which is .630 at the muzzle. The last .224 Clark barrel was 25.5 inches in no 5 profile and about .750 at the muzzle, but this rifle will be primarily used on medium game here in Oz, (with a few varmints) so I am hoping to reduce the weight where I can. This prompts my first question, do you think that the 26 inch number 3 profile would be too whippy to give sub 0.5 moa accuracy?</p><p></p><p>I am now looking for Rem 700 BDL rifle in 270W, 280R or 30/06 to soure the action. Although I have a Sako L61R action that is currently attached to a worn out 25/06 AI barrel, he does not recommend me using it for the Clark, due to the superior bedding qualities of the Remington.</p><p></p><p>My next question is what cases would you consider for this Sako L61 action? I had previously intended to rebarrel and chamber for the 280 AI, and use mainly the Nosler 140 grain BT's on medium game, and heavier bullets if the need arose. </p><p></p><p>However, if Richards's 142 grain ULD's do stabilise in my other 25/06 AI (10 twist) this seems a little pointless, as 142 grain ULD bullet with a BC of .750 or more at about 3,100 fps, should be infinitely better than a 140 grain BT with a BC of .490 at a similar velocity out of the 280 AI. </p><p></p><p>The L61R magazine length appears to be 3.575 inches, with the follower measuring 3.455 inches. I would prefer to use a rimless case, and would consider having the boltface opened up if it wasn't too expensive and any feeding issues could be overcome. The RUM cases appear to long, and the others such as the Lazzeroni, etc are expensive and difficult to source. Regards, Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 63321, member: 1067"] Fifty, Terrific group with the 80 grain Bergers, and interested to see that you had to jam them .020 into the lands to get it. Previously I have tried seating as far as .010 into the lands, but never went further as I wanted to avoid the nightmare of having a chamber full of powder if I didn't fire the shot and had to eject. My last .224 Clark only had about .002 of bullet tension, and with case variation, the above "nightmare" occured until I became better at detecting the cases with less tension. (I full length sized those cases, which gave me .004 of tension) I note that you are achieving near maximum/maximum pressure at 49.0 grains Reloader 22 and a velocity of 3,590 fps. This load would have been about 3.0 - 3.5 grains less than what I used in my last .224 Clark with similar bullet weight, and seems to be another instance of the 22/6mm with 40 degree shoulder consuming less powder than the 22/257 with 30 degree shoulder. Usually a case with 40 degree shoulder has a slightly larger capacity than one with a 30 degree shoulder. My current 22/250 AI (some call it RCBS) with 28 degree shoulder is an example of that. Richard Graves emailed 10 days ago to let me know that my order of 80 and 85 grain ULD .224 bullets (and 130 & 142 257's) had been sent by "snail mail" as it would have cost over $C90.00 to send them airmail. He said that 85 grains was the heaviest ULD that this .224 jackets and dies would make, and asked if I was interested in some 90 & 100 grain 10 ogive flat base bullets. (I said yes) Now that I know the bullets are on the way, I will order the barrel, and had intended to order a Krieger 26 inch 1 in 7 twist in number 3 profile which is .630 at the muzzle. The last .224 Clark barrel was 25.5 inches in no 5 profile and about .750 at the muzzle, but this rifle will be primarily used on medium game here in Oz, (with a few varmints) so I am hoping to reduce the weight where I can. This prompts my first question, do you think that the 26 inch number 3 profile would be too whippy to give sub 0.5 moa accuracy? I am now looking for Rem 700 BDL rifle in 270W, 280R or 30/06 to soure the action. Although I have a Sako L61R action that is currently attached to a worn out 25/06 AI barrel, he does not recommend me using it for the Clark, due to the superior bedding qualities of the Remington. My next question is what cases would you consider for this Sako L61 action? I had previously intended to rebarrel and chamber for the 280 AI, and use mainly the Nosler 140 grain BT's on medium game, and heavier bullets if the need arose. However, if Richards's 142 grain ULD's do stabilise in my other 25/06 AI (10 twist) this seems a little pointless, as 142 grain ULD bullet with a BC of .750 or more at about 3,100 fps, should be infinitely better than a 140 grain BT with a BC of .490 at a similar velocity out of the 280 AI. The L61R magazine length appears to be 3.575 inches, with the follower measuring 3.455 inches. I would prefer to use a rimless case, and would consider having the boltface opened up if it wasn't too expensive and any feeding issues could be overcome. The RUM cases appear to long, and the others such as the Lazzeroni, etc are expensive and difficult to source. Regards, Brian. [/QUOTE]
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Caliber and Barrel Length for New PD Barrel
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