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Rifles, Reloading, Optics, Equipment
Reloading
338 Win Mag load
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<blockquote data-quote="sep" data-source="post: 645184" data-attributes="member: 34774"><p>Cavtrooper94,</p><p> </p><p>I've been doin load development recently with my 338 WM and 225 TTSX bullets. My previous 338 WM loved IMR4350 but this rifle won't shoot IMR4350 or H4350 consistently. I have yet to get two groups in a row under one inch...and I've tried. I really wanted H4350 to shoot well because of its temperature stability but no dice. I would go from a 1/2 inch 3 shot group to a 2 7/8ths inch 3 shot group. Last weekend, I tried 75.0 grains H4831SC and got my first two groups to both shoot under an inch. Velocity is a little on the slow side though at 2715 fps. This weekend I'll be shootin more groups with H4831SC and chronographing em to confirm this load. BTW I've calculated the density of this load at 107+% using winchester cases and I've experienced no pressure signs at all.</p><p> </p><p>In the past with my old 338 WM, I tried RL19 and RL22 but IMR4350 trumped em both in accuracy. That rifle had a 26 inch tube so my velocity clocked in at 2825fps.</p><p> </p><p>I recently shot some Barnes VOR-TX 225 grain TTSXs to see how they performed. I got 1/2 inch groups with velocity of 2816 fps. I pulled a bullet and found a charge of 69.4 grains of a ball powder. I suspect it is a special run we handloaders can't get. Velocity is good however according to Ramshot on their website, ball powders cannot currently be made temperature insensitive so I expect different velocity from these factory loads in October here in Fairbanks. Consequently, I'll stick to the Hodgdon extreme line of powders.</p><p> </p><p>As to velocity, H4350 at 68.5 grains started showing me ejector marks on the case heads at a velocity of 2805fps. </p><p> </p><p>IMR4350 at 70.5 grains gave me a sticky bolt lift and ejector marks on the case heads...velocity clocked in at 2792fps.</p><p> </p><p>I haven't taken H4831SC beyond 75.0 grains (yet) because I don't want to compress the load anymore than I have to, to get what I need. Since I haven't encountered any pressure signs I might try and bump it up a little in charge weight but I don't think I'll reach 2800 fps before running out of case room. </p><p> </p><p>The bottom line is keep tryin powders and your barrel will tell you when you've found a match. Good shootin!</p></blockquote><p></p>
[QUOTE="sep, post: 645184, member: 34774"] Cavtrooper94, I've been doin load development recently with my 338 WM and 225 TTSX bullets. My previous 338 WM loved IMR4350 but this rifle won't shoot IMR4350 or H4350 consistently. I have yet to get two groups in a row under one inch...and I've tried. I really wanted H4350 to shoot well because of its temperature stability but no dice. I would go from a 1/2 inch 3 shot group to a 2 7/8ths inch 3 shot group. Last weekend, I tried 75.0 grains H4831SC and got my first two groups to both shoot under an inch. Velocity is a little on the slow side though at 2715 fps. This weekend I'll be shootin more groups with H4831SC and chronographing em to confirm this load. BTW I've calculated the density of this load at 107+% using winchester cases and I've experienced no pressure signs at all. In the past with my old 338 WM, I tried RL19 and RL22 but IMR4350 trumped em both in accuracy. That rifle had a 26 inch tube so my velocity clocked in at 2825fps. I recently shot some Barnes VOR-TX 225 grain TTSXs to see how they performed. I got 1/2 inch groups with velocity of 2816 fps. I pulled a bullet and found a charge of 69.4 grains of a ball powder. I suspect it is a special run we handloaders can't get. Velocity is good however according to Ramshot on their website, ball powders cannot currently be made temperature insensitive so I expect different velocity from these factory loads in October here in Fairbanks. Consequently, I'll stick to the Hodgdon extreme line of powders. As to velocity, H4350 at 68.5 grains started showing me ejector marks on the case heads at a velocity of 2805fps. IMR4350 at 70.5 grains gave me a sticky bolt lift and ejector marks on the case heads...velocity clocked in at 2792fps. I haven't taken H4831SC beyond 75.0 grains (yet) because I don't want to compress the load anymore than I have to, to get what I need. Since I haven't encountered any pressure signs I might try and bump it up a little in charge weight but I don't think I'll reach 2800 fps before running out of case room. The bottom line is keep tryin powders and your barrel will tell you when you've found a match. Good shootin! [/QUOTE]
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