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> 7x57mm 160gn loads > 2600fps
7x57mm 160gn loads > 2600fps
@ 10:01 pm (GMT) |
John HodgsonHi. In your section on this calibre you discuss the effectiveness of the 160gn g Speer Hotcor projectile at velocities greater than 2600fps on larger game.Neither ADI nor Hogdon currently list load data for any 160gn projectile even reaching 2600 fps let alone exceeding it. I am running an Interarms Mark X in 7x57mm which has the Zastava M98 action. I am not looking for excessive velocity but would like to do better than the 2200-2400fps most listed powders seem to float around. I do have some IMR 4831 that the listed max load offers 2515fps from 46.2gn max load. Also RL19 that offers 2570fps from 45gn. I am running a 21in suppressed barrel so will likely be a little under these velocities. Apart from these two powders, what others do you recommend with load data for velocities exceeding 2600fps? cheers |
Replies
@ 07:19 am (GMT) |
Luis VazquezRe: 7x57mm 160gn loads > 2600fpsHi John:For reference, the Sierra Bullets Reloading App shows several powders pushing their 160gr bullets past 2,600 fps. Don't know if you have access to all these powders but here they are: IMR-4350, A4350, IMR-4831, H4831SC, and RL19. Obviously you can work your way up and see where you hit max load. These powders show 2,660 fps when hitting max charge with a 26", you'll provably lose about 25 to 30 fps per every 2" shorter. Speer Load data also shows RL16 and RL17 getting past 2,600 fps with a 24" barrel. Hope this helps. Luis |
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@ 08:18 am (GMT) |
John HodgsonRe: 7x57mm 160gn loads > 2600fpsThks Luis, I have 4831 and RL19. Will go look for the Sierra data. Interesting that the bullet manufacturers are more specific than the powder guys. I should have thought of that. Cheers. John |
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@ 08:37 am (GMT) |
Luis VazquezRe: 7x57mm 160gn loads > 2600fpsNo worries, anytime.Yes, the bullet manufacturer's reloading data is way more specific. If you have issues finding it, let me know. Regards, Luis |
@ 10:26 am (GMT) |
Nathan FosterRe: 7x57mm 160gn loads > 2600fpsHi John, I need to clarify this.In the hand loading section o9f the 7x57, I suggested 2600fps as a realistic muzzle velocity for 22" barreled rifles. When describing the Hotcor, I wanted to include a description of its behavior right across the velocity spectrum so that the reader had a broad understanding of the projectile beyond the cartridge. This is a bullet that most people no longer use or understand so I wanted to make sure folk had this info. It was not my intention to suggest loading at very high speeds. In addition to this, as I have written elsewhere (I think in the game killing section), we should not hang our hats on hydrostatic shock. This phenomenom can help to produce a very fast kill and while it may be possible to encourage it, we cannot rely on this due to factors such as range, game weights (or seasonal condition), hide condition (wet vs dry) and shot placement. Again, the goal of the article was to describe what may occur at various impact velocities. All of the above aside, some 7x57 rifles, depending on barrel length etc are capable of achieving relatively high velocities. But generally speaking, you will need to work beyond the info given in reloading manuals. This subject (how to perform checks etc) is discussed in detail in my reloading book. Working toward high speeds is a good thing as it helps to ensure a clean kill, whether one is discussing hydraulic force, hydrostatic shock or basic mechanical wounding. Your Reloader 19 is a good powder to use for experimentation. OK, hope that helps a bit. |
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@ 12:30 pm (GMT) |
John HodgsonRe: 7x57mm 160gn loads > 2600fpsThks Nathan, appreciate the clarification. It is good to have the info even on product no longer available or in widespread use. As it happens I have a acquired a couple of hundred of the 160gn Hotcors. With the current availability issues I certain plan to use them. As most of my hunting is medium game under 200m they will be perfectly adequate and will clearly do the job I want up around the 2400-2500fps mark.Thks for all the input. Cheers. John |
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