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Joined: Nov 2011
Posts: 30,902
Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2011
Posts: 30,902 |
Low Velocity 7x57, isn't the redundant?? Not at all. In a modern action, loaded to 30-06 pressures, the 7x57 is a fine performer. At 54 KPSI, I get 2750 FPS with 162 grain bullets, in a 24" barrel. The 7x57 and 270 are nearly ballistic twins. Book on the 7x57 is only 51k. At 54k you would be above book, and you might blow yourself up!!  Book on the .270 Win is 65k, so load data actually reflects the capabilities of the rifles.
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
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Joined: Jan 2001
Posts: 28,365
Campfire Ranger
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Campfire Ranger
Joined: Jan 2001
Posts: 28,365 |
I was just out this past weekend trying this. Bullet was a Hornady 139 BTSP, rifle was a Zastava 7X57 with 24" barrel. 40 grains of RL-15 gave just at 2400 fps, avg for 4 shots was 2396 fps. 39 and 40 grains both printed groups with three shots touching and my signature %&*#$%!! flyer.  Also 39 to 40 grains of IMR 4895 gives low to mid 2400 fps velocity but in my rifle accuracy wasn't nearly as good as with the RL-15 loads. Recoil is very mild as you would expect.
Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!
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Joined: Dec 2004
Posts: 17,229
Campfire Ranger
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Campfire Ranger
Joined: Dec 2004
Posts: 17,229 |
I could tell a difference between 20-22gr of Blue Dot with 120's and 31gr of H4198 and 110's (7mm-08). The Blue Dot loads were softer and quieter. That being said, not everybody is comfortable using a powder that you could possibly double charge.
Now with even more aplomb
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Joined: Jun 2004
Posts: 11,114
Campfire Outfitter
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Campfire Outfitter
Joined: Jun 2004
Posts: 11,114 |
Book on the 7x57 is only 51k. At 54k you would be above book, and you might blow yourself up!! laugh LOL.... I always say that rifles can't read headstamps.
Be not weary in well doing.
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Joined: Jul 2006
Posts: 2,736
Campfire Regular
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Campfire Regular
Joined: Jul 2006
Posts: 2,736 |
IMR or H4895 should be good. I see it suggested often for reduced loads. I have used it for fire forming 280AI cases and it works well. I've read and believe that it's never a good idea to use slow burning powder for reduced loads and in rare instances can even be dangerous.
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Joined: Nov 2009
Posts: 3,927
Campfire Tracker
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Campfire Tracker
Joined: Nov 2009
Posts: 3,927 |
Run a .280AI reamer into the chamber, crisis resolved.
Keep your gun-hand ready and your eyes peeled.
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Joined: May 2005
Posts: 14,104
Campfire Outfitter
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Campfire Outfitter
Joined: May 2005
Posts: 14,104 |
RevMike,
Here are some starters from Loaddata using 139-140 grain bullets:
IMR 4895, 24.5 gr, 2,420 fps
AAC 2520, 31.4 gr, 2,050 fps
AAC 2620, 42.0 gr, 2,605 fps
RL 19, 41.0 gr, 2,040 fps
RL 22, 44.8 gr, 2,180 fps
Hope this helps.
Ben
Last edited by mudhen; 01/09/14.
Ben
Some days it takes most of the day for me to do practically nothing...
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