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Velocity Spreads--What is reasonable?

RustyNailRustyNail Member Posts: 803 ✭✭✭✭
edited November 2006 in Perry Shooter Competition Shooting and Reloading Forum
I had about a dozen or so loads developed for SW500 caliber (various bullets 330-500 grain) with velocity spreads under 15fps. My powder is no longer available and now the tightest spreads I can achieve are around 25fps. How bad will this affect accuracy on bullets in this weight range at 1350-1700 fps velocities? (I don't have a Ransome-rest to just try it out--but some of my customers might!)
Thanks, Rusty
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Comments

  • richbugrichbug Member Posts: 3,650
    edited November -1
    Are you shooting these out of a revolver? You are using the same chamber every time right?

    25 fps extreme spread isn't a big deal for handgun ammo.
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  • RustyNailRustyNail Member Posts: 803 ✭✭✭✭
    edited November -1
    Good point! No, I haven't been re-using the same chamber. I never thought of that as being a controllable variable. I suppose I should let the gun cool a few minutes between shots too.
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  • richbugrichbug Member Posts: 3,650
    edited November -1
    If you want to really know how consistent your ammo is, you need to shoot it out of a carbine. Take the vented barrel out of the equation.

    The NEF can be had for $200.
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  • glabrayglabray Member Posts: 679 ✭✭✭✭
    edited November -1
    It is difficult to separate the variability of your loads from the variability of your chronograph. I've tried nearly all the off-the-shelf chronos and they all leave a lot to be desired in terms of reliability and repeatability. I did find that the higher priced units are better than the cheapies.
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  • perry shooterperry shooter Member Posts: 17,105 ✭✭✭
    edited November -1
    Hello I have tried to Chron. many pistols and found that we tend to put the sky screens tooo close to the pistol "to keep from hitting the screens" this allows smoke and gases to give false readings .This said if you had good results with old powder and nothing changed but the powder then try another type of powder . 25 FPS is good by the way and out of a ransom rest some of my best 50 yard groups had more spread then that.
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  • 375H&H375H&H Member Posts: 1,544 ✭✭✭✭✭
    edited November -1
    Was wondering what type of powder you were using that is no longer available ? I load Hornady and Sierra 350 gr bullets with both H-110 and Win 296 and have good results . Just started loading the same bullets with AA#9 but didn't get to fire any off yet .
    The 500 mag IMHO can be lots of fun to shoot , as long as I stay away from those 440gr or bigger bullets .
    Waiting for someone to load and shoot some of these monsters [xx(]

    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7239308891&rd=1&sspagename=STRK:MEWA:IT&rd=1
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  • JustCJustC Member Posts: 16,056 ✭✭✭
    edited November -1
    in all reality,..in a REVOLVER,..I see no point in measuring velocity variation. If they group well,...shoot that load. Now if you were shooting competition at 1000yds,..I would say different. BUT even then,...many of the best loads are NOT the ones with the least standard deviation.

    Shoot what groups best,.....the range of a pistol is menial at best. MHO
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