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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5 STW Findings
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<blockquote data-quote="stcummingsjr" data-source="post: 808117" data-attributes="member: 7597"><p>Just wanted to pass along some info after getting my feet wet with my 6.5 STW . </p><p>This rifle has a 3 grove 1-9 twist Pac Nor finished at 28 inches. </p><p></p><p>I started into this project hoping like everyone else to hit 3400 fps with a 140 </p><p>class bullet. I had 140 amax, 130 scirocco , 140 smk and 142smk to try out...In </p><p>hopes of squeezing the most accuracy/speed out of this class/ weight of bullet. </p><p></p><p>I started with the 140 amax hoping to find a good load to use on LR coyotes </p><p>around the ranch. I worked my way up to 86.6 of wc-870 at a vol. of 3385. It </p><p>shot 1/2" groups and I tested out to 500 yrs on rocks with great results. </p><p></p><p>I then got curious and decided to see what other combos it would shoot well. </p><p></p><p>Tried - Retumbo, Ramshot mag, RL-33 in addition to Wc-870 & 872</p><p></p><p>It shot the 130 scirocco's at a max load of 81.2 grs of RL-33. They shot at an </p><p>avg. of 3470 fps into the .7 range. This load was around 70 to 80 fps faster </p><p>than I could initially reach with Retumbo or Ramshot mag in this rifle before </p><p>seeing pressure signs. This bullet like others have found was little slower in regards to vol. than I had hopped for. </p><p></p><p>At this point I had around 150 rds through this rifle. </p><p></p><p>I decided to take my old 140 amax load out for a stretch ...It would </p><p>consistently put three shots 3/4" apart at 200yds, but then it started throwing the </p><p>3rd or 4th shot 2" out of the group... ?</p><p></p><p>I then shot a group after allowing the barrel to cool completely after each </p><p>shot...it shot without incident, no 2" flyers! </p><p></p><p>So.... I believe that with a little extra heat from the shot string and my </p><p>increasingly rougher throat, that I started to see issues with the amax at my </p><p>speed of 3385 with my 3 grove 1-9 twist barrel at around 150 rds. Anyone else run into this with </p><p>the 6.5 amax's at this speed? I steered clear of 140 vld because of not wanting to wast time </p><p>and barrel life on a bullet that would not hold up at extreme speed/pressure but </p><p>may have run into the same issue anyways. </p><p></p><p>I knew that my combination was prone to this type of issue, 3 grove/thin jacket/ </p><p>high vol. but did not realize that Amax's may also have been prone. </p><p></p><p> I then ran 3 rds of tubs Final Finish throat maintenance before trying to </p><p>perfect my next load.</p><p></p><p>I loaded up a few 140 smk that I had on hand... Worked up to 86.2 gr of wc-870 </p><p>... shot 3rds at my 450 yard target....3" group....hum.... Some promise.</p><p></p><p>Set up the CED Chronograph and shot 3 rounds loaded at 86gr. of 3400fps into a </p><p>tiny little hole at 100yds.</p><p></p><p>Stepped out to 350 yds and printed a 1.3" group with a it's max load of 86.8 grs </p><p>of wc-870</p><p></p><p></p><p>I backed it back down to 86.0 gr. of wc-870 to save on brass. This load produced </p><p>a 10 shot ES of 19 fps.. Which was as low as any other powder I tried in this </p><p>rifle.</p><p></p><p>Other loads tried so far..worked up to max</p><p></p><p>140 smk</p><p>Fed 215</p><p>86.2 gr wc-870- ave 3415 fps</p><p>86.8 gr.* Max load 3440 - 1.3" group@ 350yds</p><p>86 gr. wc-870 ave 3400- .352 group!!! (continues to shoot well, my working load) </p><p></p><p></p><p></p><p>130 scirocco ii</p><p>Fed 215</p><p>79 gr ramshot mag- 3375 fps</p><p>*Max load- slight pressure </p><p>1inch group</p><p></p><p>130 scir</p><p>Fed 215</p><p>79.5 remtumbo- 3344 </p><p>Max load </p><p>1.2" group</p><p></p><p>130 scir</p><p>Fed 215</p><p>88.2 gr wc-870 - 3350</p><p>1/2" group</p><p></p><p>130 scir </p><p>Fed 215</p><p>Rl-33 81.2- 3460</p><p>*Max load </p><p>3/4" group</p><p></p><p> </p><p>I'm hoping to start testing the barns 127 LXR Shortly in order to find a Good </p><p>non lead load for our lead free zones here in CA. </p><p></p><p>And waiting on some of the matrix 6.5's <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>The Testing platform</p></blockquote><p></p>
[QUOTE="stcummingsjr, post: 808117, member: 7597"] Just wanted to pass along some info after getting my feet wet with my 6.5 STW . This rifle has a 3 grove 1-9 twist Pac Nor finished at 28 inches. I started into this project hoping like everyone else to hit 3400 fps with a 140 class bullet. I had 140 amax, 130 scirocco , 140 smk and 142smk to try out...In hopes of squeezing the most accuracy/speed out of this class/ weight of bullet. I started with the 140 amax hoping to find a good load to use on LR coyotes around the ranch. I worked my way up to 86.6 of wc-870 at a vol. of 3385. It shot 1/2" groups and I tested out to 500 yrs on rocks with great results. I then got curious and decided to see what other combos it would shoot well. Tried - Retumbo, Ramshot mag, RL-33 in addition to Wc-870 & 872 It shot the 130 scirocco's at a max load of 81.2 grs of RL-33. They shot at an avg. of 3470 fps into the .7 range. This load was around 70 to 80 fps faster than I could initially reach with Retumbo or Ramshot mag in this rifle before seeing pressure signs. This bullet like others have found was little slower in regards to vol. than I had hopped for. At this point I had around 150 rds through this rifle. I decided to take my old 140 amax load out for a stretch ...It would consistently put three shots 3/4" apart at 200yds, but then it started throwing the 3rd or 4th shot 2" out of the group... ? I then shot a group after allowing the barrel to cool completely after each shot...it shot without incident, no 2" flyers! So.... I believe that with a little extra heat from the shot string and my increasingly rougher throat, that I started to see issues with the amax at my speed of 3385 with my 3 grove 1-9 twist barrel at around 150 rds. Anyone else run into this with the 6.5 amax's at this speed? I steered clear of 140 vld because of not wanting to wast time and barrel life on a bullet that would not hold up at extreme speed/pressure but may have run into the same issue anyways. I knew that my combination was prone to this type of issue, 3 grove/thin jacket/ high vol. but did not realize that Amax's may also have been prone. I then ran 3 rds of tubs Final Finish throat maintenance before trying to perfect my next load. I loaded up a few 140 smk that I had on hand... Worked up to 86.2 gr of wc-870 ... shot 3rds at my 450 yard target....3" group....hum.... Some promise. Set up the CED Chronograph and shot 3 rounds loaded at 86gr. of 3400fps into a tiny little hole at 100yds. Stepped out to 350 yds and printed a 1.3" group with a it's max load of 86.8 grs of wc-870 I backed it back down to 86.0 gr. of wc-870 to save on brass. This load produced a 10 shot ES of 19 fps.. Which was as low as any other powder I tried in this rifle. Other loads tried so far..worked up to max 140 smk Fed 215 86.2 gr wc-870- ave 3415 fps 86.8 gr.* Max load 3440 - 1.3" group@ 350yds 86 gr. wc-870 ave 3400- .352 group!!! (continues to shoot well, my working load) 130 scirocco ii Fed 215 79 gr ramshot mag- 3375 fps *Max load- slight pressure 1inch group 130 scir Fed 215 79.5 remtumbo- 3344 Max load 1.2" group 130 scir Fed 215 88.2 gr wc-870 - 3350 1/2" group 130 scir Fed 215 Rl-33 81.2- 3460 *Max load 3/4" group I'm hoping to start testing the barns 127 LXR Shortly in order to find a Good non lead load for our lead free zones here in CA. And waiting on some of the matrix 6.5's :) The Testing platform [/QUOTE]
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