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Rifles, Reloading, Optics, Equipment
Reloading
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<blockquote data-quote="dougduey" data-source="post: 1371459" data-attributes="member: 33159"><p>Range report. </p><p>I switched to RL26 powder and dropped down from 87.5 gr that gave me a stiff bolt lift a couple weeks ago (velocity 2993 fps @ 74 degrees). So, I loaded rounds in 0.3 gr increments from 86.0-87.2. Not a single issue. Found a velocity "flat spot" node from 86.3-86.9 of 2937 fps with the 86.3 & 86.6 in the same hole and 86.9 to the right by 1/4". Velocities were about 20-25 fps less than what Quickload had predicted (based upon the 2993 velocity of 87.5 gr) until I adjusted the temp down to 50 degrees in Quickload......then it was pretty much dead on. So I think I'm close to being done. I'll load rounds up at 86.6 gr to check the velocity ES & SD and shoot more to see how they group.</p><p>I think the issue was the Retumbo. I had loaded up 3 rounds of the 250 SMK with Nosler's starting load of 91.0 gr. Sticky bolt on all 3. Can't tell you why Retumbo is creating so much pressure in my rifle. Maybe it's the combo of the Nosler brass and the Retumbo. I have a box of 100 Lapua cases I was saving for later. I may need to test and see if the Lapua cases makes a difference.</p><p>It won't be a total waste if I can't use the Retumbo in the 338, since my 6.5-284 Norma and 7 STW both like Retumbo. Funny thing is I've never seen much of a combined temperature & pressure issue with Retumbo in either of those rifles, which makes me want to do some testing with them now so I don't run into this issue when hunting.</p></blockquote><p></p>
[QUOTE="dougduey, post: 1371459, member: 33159"] Range report. I switched to RL26 powder and dropped down from 87.5 gr that gave me a stiff bolt lift a couple weeks ago (velocity 2993 fps @ 74 degrees). So, I loaded rounds in 0.3 gr increments from 86.0-87.2. Not a single issue. Found a velocity "flat spot" node from 86.3-86.9 of 2937 fps with the 86.3 & 86.6 in the same hole and 86.9 to the right by 1/4". Velocities were about 20-25 fps less than what Quickload had predicted (based upon the 2993 velocity of 87.5 gr) until I adjusted the temp down to 50 degrees in Quickload......then it was pretty much dead on. So I think I'm close to being done. I'll load rounds up at 86.6 gr to check the velocity ES & SD and shoot more to see how they group. I think the issue was the Retumbo. I had loaded up 3 rounds of the 250 SMK with Nosler's starting load of 91.0 gr. Sticky bolt on all 3. Can't tell you why Retumbo is creating so much pressure in my rifle. Maybe it's the combo of the Nosler brass and the Retumbo. I have a box of 100 Lapua cases I was saving for later. I may need to test and see if the Lapua cases makes a difference. It won't be a total waste if I can't use the Retumbo in the 338, since my 6.5-284 Norma and 7 STW both like Retumbo. Funny thing is I've never seen much of a combined temperature & pressure issue with Retumbo in either of those rifles, which makes me want to do some testing with them now so I don't run into this issue when hunting. [/QUOTE]
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