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
Rifles, Bullets, Barrels & Ballistics
The .338 Rogue
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="Pdvdh" data-source="post: 1215221" data-attributes="member: 4191"><p><strong>Re: The .338 Lapua 37* Rogue - First Grouping & Load Data</strong></p><p></p><p>On the 4th of July I fired the first nine shots thru the 338 Rogue, after mounting a 3-15x42mm Vortex Razor HD LH scope. Here's a picture of the first group, and a spreadsheet containing the loads that delivered this group at a distance of 280 yds.</p><p></p><p>[ATTACH=full]88413[/ATTACH]</p><p></p><p>The round (Rnd) number from the following spreadsheet that identifies each round's POI on the target is written next to each bullet hole. Loads 5, 6, 7, and 8, impacted within 1 1/8" of one another at 280yds. Powder charges for loads 5, 6, 7, and 8 were 104, 105, 106, and 107 grains of RL 33.</p><p>[ATTACH=full]88415[/ATTACH] </p><p></p><p></p><p>I register on the Obsessive Compulsive Disorder spectrum, so there's a butt-load of collected data included on the spreadsheet for each load. I receive 4 recorded bullet velocities for each bullet fired from a triplicate chronograph setup. Only the primary channel velocity from the Oehler 35P is shown on the spreadsheet, so only 3 of the 4 recorded velocities are presented for each bullet fired.</p><p></p><p>My chronographs were set up 40' off the muzzle, so the velocities in blue font are the corrected muzzle velocities. It look's as though I'm going to max out - pressure wise - at about 2965fps MV with bullets jammed 0.012", using Alliant RL 33. If I jumped the bullets 0.020", I could likely achieve higher MV.</p><p></p><p>The barrel is a 28" long nitrided Bartlein. The Berger 300gr OTM bullets are HBN coated.</p><p></p><p>Round #1 was fired with the bore freshly coated with HBN. This HBN residue left in the bore after pre-swabbing the clean bore with an alcohol / HBN mixture increases pressure (and velocity) on the first bullet fired down the bore. This has been experienced with each rifle I've chronographed after HBN swabbing a cleaned bore. This explains why the 96gr load actually fired at a slightly higher pressure and MV than round #2, even though the round #2 was charged with 2 more grains of powder than round #1.</p><p></p><p>The progressive rate of increased velocity is shown for each load compared to the prior load, in the column to the right of the MVs. Two columns farther to the right are the maximum recorded differences in velocities for each bullet fired, between the three chronographs. The maximum difference in recorded velocity for any bullet fired was 4fps, which occurred on rounds #1 and #9.</p><p></p><p>The three columns to the far right on the spreadsheet show the case head diameters, pre-fired and post-fired, and the magnitude of any measured case head expansion. The 108 grain load did swell the case head about 0.0006". The 108 grain load also impacted ~2" lower than the 4 prior rounds.</p><p></p><p>BAT actions are slow to show pressure signs such as stiff bolt lift. There were no plunger marks on any of the case heads. And absolutely no bolt lift resistance.</p><p></p><p>It look's like I'm maxing out pressure-wise just slightly quicker than Greg Duley was with his .338 Lapua Improved with RL33, but Greg's Lapua Improved cartridge is probably blown out a little larger than mine, with slightly great case capacity.</p><p></p><p>I have no experience with Lapua's 338 Lapua brass. Anybody know if after the first firing and slight case head expansion, if these Lapua case heads and primer pockets will then endure similarly pressured firings with less expansion on subsequent rounds? I plan to load the 108 grain charged casing a few more times with additional 108 grain charges in order to measure and monitor any further, progressive case head expansion.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1215221, member: 4191"] [B]Re: The .338 Lapua 37* Rogue - First Grouping & Load Data[/B] On the 4th of July I fired the first nine shots thru the 338 Rogue, after mounting a 3-15x42mm Vortex Razor HD LH scope. Here's a picture of the first group, and a spreadsheet containing the loads that delivered this group at a distance of 280 yds. [ATTACH=full]88413[/ATTACH] The round (Rnd) number from the following spreadsheet that identifies each round's POI on the target is written next to each bullet hole. Loads 5, 6, 7, and 8, impacted within 1 1/8" of one another at 280yds. Powder charges for loads 5, 6, 7, and 8 were 104, 105, 106, and 107 grains of RL 33. [ATTACH=full]88415[/ATTACH] I register on the Obsessive Compulsive Disorder spectrum, so there's a butt-load of collected data included on the spreadsheet for each load. I receive 4 recorded bullet velocities for each bullet fired from a triplicate chronograph setup. Only the primary channel velocity from the Oehler 35P is shown on the spreadsheet, so only 3 of the 4 recorded velocities are presented for each bullet fired. My chronographs were set up 40' off the muzzle, so the velocities in blue font are the corrected muzzle velocities. It look's as though I'm going to max out - pressure wise - at about 2965fps MV with bullets jammed 0.012", using Alliant RL 33. If I jumped the bullets 0.020", I could likely achieve higher MV. The barrel is a 28" long nitrided Bartlein. The Berger 300gr OTM bullets are HBN coated. Round #1 was fired with the bore freshly coated with HBN. This HBN residue left in the bore after pre-swabbing the clean bore with an alcohol / HBN mixture increases pressure (and velocity) on the first bullet fired down the bore. This has been experienced with each rifle I've chronographed after HBN swabbing a cleaned bore. This explains why the 96gr load actually fired at a slightly higher pressure and MV than round #2, even though the round #2 was charged with 2 more grains of powder than round #1. The progressive rate of increased velocity is shown for each load compared to the prior load, in the column to the right of the MVs. Two columns farther to the right are the maximum recorded differences in velocities for each bullet fired, between the three chronographs. The maximum difference in recorded velocity for any bullet fired was 4fps, which occurred on rounds #1 and #9. The three columns to the far right on the spreadsheet show the case head diameters, pre-fired and post-fired, and the magnitude of any measured case head expansion. The 108 grain load did swell the case head about 0.0006". The 108 grain load also impacted ~2" lower than the 4 prior rounds. BAT actions are slow to show pressure signs such as stiff bolt lift. There were no plunger marks on any of the case heads. And absolutely no bolt lift resistance. It look's like I'm maxing out pressure-wise just slightly quicker than Greg Duley was with his .338 Lapua Improved with RL33, but Greg's Lapua Improved cartridge is probably blown out a little larger than mine, with slightly great case capacity. I have no experience with Lapua's 338 Lapua brass. Anybody know if after the first firing and slight case head expansion, if these Lapua case heads and primer pockets will then endure similarly pressured firings with less expansion on subsequent rounds? I plan to load the 108 grain charged casing a few more times with additional 108 grain charges in order to measure and monitor any further, progressive case head expansion. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
The .338 Rogue
Top