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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Remington Ultra Mag load data desired
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<blockquote data-quote="Guest" data-source="post: 20994"><p>Dave,</p><p></p><p> I received a 338 Rem Ultra as a gift from my wife a few weeks ago. It was very nice of her to hear me say that I was interested in getting one, then to go out and get it for me. Anyway, I mounted a scope on it, worked the trigger down to 2 1/2 pounds and then reloaded a few rounds for it. I had some H870 sitting around to start with and one hundred 300 grain Matchkings.</p><p></p><p>Here is the data;</p><p>Remington 700 Stainless Sendero 26" bbl</p><p>Tasco 20x42 Sniper Scope (need a better scope!)</p><p>ProChrono@15 feet</p><p></p><p>300 Sierra MKHP</p><p>COL - 3.775" (.010 off the lands)</p><p>New re-sized/trimmed Remington Cases </p><p>Fed 215GM</p><p>Hodgdon H870</p><p>100 yds.</p><p>Altitude 8800 feet/Temp; 70F - 85F/slight breeze from any direction (mountains)</p><p></p><p>88.0 gns 2233 fps (cleaned barrel)</p><p>89.0 gns 2365 fps " "</p><p>90.0 gns 2420 fps " "</p><p>91.0 gns 2465 fps " "</p><p>92.0 gns 2495 fps (cleaned barrel)</p><p>93.0 gns 2485 fps</p><p>94.0 gns 2565 fps</p><p>95.0 gns 2610 fps</p><p></p><p>88 to 92 gns went into 2.8"@100 yds. (I would expect from being cleaned after every round fired)</p><p></p><p>93 to 95 gns went in to .550"@100 yds (without being cleaned after every shot)</p><p></p><p>No pressure signs were visible on the cases. I cleaned the barrel after each of the first five rounds then after each three shot group.</p><p></p><p>98.0 gns - 2575 fps</p><p> - 2611 fps</p><p> - 2594 fps </p><p>Av - 2593 fps S/D - 54</p><p>group size .880"@100yds.</p><p></p><p>99.0 gns - 2649 fps (slight ejector mark)</p><p> - 2597 fps (slight ejector mark)</p><p> - 2674 fps (slight ejector mark)</p><p></p><p>Av- 2640 fps S/D - 42</p><p>group size 1.250"@100 yds</p><p></p><p>100.0 gns - 2674 fps (ejector mark)</p><p> - 2611 fps " "</p><p> - 2549 fps " "</p><p>Av- 2611 fps S/D - 38</p><p>group size 1.760"@100 yds.</p><p></p><p>99 and 100 gns is over max as the velocity fell off but the pressure increased. Accuracy went away pretty fast also. Looking at the data I would expect 93 to 95 gns to be the sweet spot. This rifle has no brake on it and it recoils very heavy. In fact it was very hard not to flinch as the charge and velocity increased. I may have to put a brake on it to survive the recoil. It kicks much harder than my 340 Weatherby in a Win Mod 70 Sporter. </p><p> </p><p> I'm not sure I trust the Standard Deviation that the chrono was giving me. </p><p></p><p> I will be trying Reloader 25 and 22 this weekend with both the 250 Gameking and the 300 MKHP. I'll post the data if you are interested.</p><p></p><p> Sorry for the long post.</p><p></p><p>Guy</p></blockquote><p></p>
[QUOTE="Guest, post: 20994"] Dave, I received a 338 Rem Ultra as a gift from my wife a few weeks ago. It was very nice of her to hear me say that I was interested in getting one, then to go out and get it for me. Anyway, I mounted a scope on it, worked the trigger down to 2 1/2 pounds and then reloaded a few rounds for it. I had some H870 sitting around to start with and one hundred 300 grain Matchkings. Here is the data; Remington 700 Stainless Sendero 26" bbl Tasco 20x42 Sniper Scope (need a better scope!) ProChrono@15 feet 300 Sierra MKHP COL - 3.775" (.010 off the lands) New re-sized/trimmed Remington Cases Fed 215GM Hodgdon H870 100 yds. Altitude 8800 feet/Temp; 70F - 85F/slight breeze from any direction (mountains) 88.0 gns 2233 fps (cleaned barrel) 89.0 gns 2365 fps " " 90.0 gns 2420 fps " " 91.0 gns 2465 fps " " 92.0 gns 2495 fps (cleaned barrel) 93.0 gns 2485 fps 94.0 gns 2565 fps 95.0 gns 2610 fps 88 to 92 gns went into 2.8"@100 yds. (I would expect from being cleaned after every round fired) 93 to 95 gns went in to .550"@100 yds (without being cleaned after every shot) No pressure signs were visible on the cases. I cleaned the barrel after each of the first five rounds then after each three shot group. 98.0 gns - 2575 fps - 2611 fps - 2594 fps Av - 2593 fps S/D - 54 group size .880"@100yds. 99.0 gns - 2649 fps (slight ejector mark) - 2597 fps (slight ejector mark) - 2674 fps (slight ejector mark) Av- 2640 fps S/D - 42 group size 1.250"@100 yds 100.0 gns - 2674 fps (ejector mark) - 2611 fps " " - 2549 fps " " Av- 2611 fps S/D - 38 group size 1.760"@100 yds. 99 and 100 gns is over max as the velocity fell off but the pressure increased. Accuracy went away pretty fast also. Looking at the data I would expect 93 to 95 gns to be the sweet spot. This rifle has no brake on it and it recoils very heavy. In fact it was very hard not to flinch as the charge and velocity increased. I may have to put a brake on it to survive the recoil. It kicks much harder than my 340 Weatherby in a Win Mod 70 Sporter. I'm not sure I trust the Standard Deviation that the chrono was giving me. I will be trying Reloader 25 and 22 this weekend with both the 250 Gameking and the 300 MKHP. I'll post the data if you are interested. Sorry for the long post. Guy [/QUOTE]
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338 Remington Ultra Mag load data desired
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