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Long Range Hunting & Shooting
338 Allen Xpress, RL33 load development
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<blockquote data-quote="Pdvdh" data-source="post: 1104183" data-attributes="member: 4191"><p><strong>Re: RL33 load development, bullet seating depth, ES & SD</strong></p><p></p><p>Just chronographed some MVs with RL33 yields in my 30/375 S.I. This is the 375 Ruger blown out to minimum body taper, 40* shoulder, necked down to .308 caliber. Shooting the 215gr Berger Hybrid at MV ~ 3060fps.</p><p></p><p>I was seeing ES of up to 50fps for 3 shots fired during load development with bullets seated at the lands and just off the lands (0.010" jump off the lands). However I'd noticed during case fireforming that the bullets that were jammed hard into the lands were generally all producing MVs with low ES, at varying RL33 powder charges.</p><p></p><p>So I loaded three <u>maximum loads</u> (87.7gr RL33) with the 215gr Berger Hybrids jammed 0.012" into the lands, and fired them over my triplicate chronographs. This yielded an ES of 9 and a SD of ~4. Very happy with these numbers. The low ES and SD is consistent with what I was seeing while fireforming cases with bullets jammed hard (up to 0.021") into the lands, so I have more confidence than just these last 3 shots over the chronographs.</p><p></p><p>RL33 was producing good velocity, but I was having trouble with elevated ES and SD. After reviewing the data previously collected during fireforming and just after fireforming, it became evident that ES was very consistently low with the bullets jammed.</p><p></p><p>Kirby said ES improved as the bullet jump to the lands decreased. In my case, I had to jam the bullets into the lands to see the improvement. This is the only rifle I currently use RL33 in, so this is my only 1st hand experience with RL33, bullet seating depths, and ES/SD.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1104183, member: 4191"] [b]Re: RL33 load development, bullet seating depth, ES & SD[/b] Just chronographed some MVs with RL33 yields in my 30/375 S.I. This is the 375 Ruger blown out to minimum body taper, 40* shoulder, necked down to .308 caliber. Shooting the 215gr Berger Hybrid at MV ~ 3060fps. I was seeing ES of up to 50fps for 3 shots fired during load development with bullets seated at the lands and just off the lands (0.010" jump off the lands). However I'd noticed during case fireforming that the bullets that were jammed hard into the lands were generally all producing MVs with low ES, at varying RL33 powder charges. So I loaded three [U]maximum loads[/U] (87.7gr RL33) with the 215gr Berger Hybrids jammed 0.012" into the lands, and fired them over my triplicate chronographs. This yielded an ES of 9 and a SD of ~4. Very happy with these numbers. The low ES and SD is consistent with what I was seeing while fireforming cases with bullets jammed hard (up to 0.021") into the lands, so I have more confidence than just these last 3 shots over the chronographs. RL33 was producing good velocity, but I was having trouble with elevated ES and SD. After reviewing the data previously collected during fireforming and just after fireforming, it became evident that ES was very consistently low with the bullets jammed. Kirby said ES improved as the bullet jump to the lands decreased. In my case, I had to jam the bullets into the lands to see the improvement. This is the only rifle I currently use RL33 in, so this is my only 1st hand experience with RL33, bullet seating depths, and ES/SD. [/QUOTE]
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338 Allen Xpress, RL33 load development
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