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Thread: velocity

  1. #1

    velocity

    Hi all, ive recently got a 6.5 06, I loaded it to sierra accuload powder measures,it really seems quite pokey with 140gr bullets, am yet to chrony, with aporox 100yd zero, when i mean approx zero i changed from 139gr scenars too 142gr smks,my elevation at 1000yds was 6.7 milrad,calculating the elevation to my reckoning bullet speed would be 3075fps, is this possible from a 26 inch 1 in 200mm twist, atb swaro

  2. #2
    I would guess yes
    Right where's those stones , I'll start !

  3. #3
    that is factory 270/25-06 speed with a shorter barrel albeit slightly lighter bullets in most cases

  4. #4
    Quote Originally Posted by swarovski View Post
    Hi all, ive recently got a 6.5 06, I loaded it to sierra accuload powder measures,it really seems quite pokey with 140gr bullets, am yet to chrony, with aporox 100yd zero, when i mean approx zero i changed from 139gr scenars too 142gr smks,my elevation at 1000yds was 6.7 milrad,calculating the elevation to my reckoning bullet speed would be 3075fps, is this possible from a 26 inch 1 in 200mm twist, atb swaro
    It seems unlikely. You don't say which bullet you are using or which powder. But the following is indicative.

    Quickload states that with a Hornady AMAX 140g bullet, 61.0g of N165, and in a 26" barrel you would get 3019 fps but with a peak pressure of 61,800 psi. The maximum service pressure is 63,000 psi so you would be pushing the envelope. With just another 0.1g of powder, you would be producing 3023 fps (a gain of 4 fps) but at a cost of 62,200 psi. I'm not sure you could get 61 grains of powder into the 6.5-06 case but even if you could, it would be foolish to do so without working up from, say, 59.0g which should deliver 2930 fps at 55,800 psi.

    I hope this helps.

    -JMS

  5. #5
    Quote Originally Posted by JMS906 View Post
    It seems unlikely. You don't say which bullet you are using or which powder. But the following is indicative.

    Quickload states that with a Hornady AMAX 140g bullet, 61.0g of N165, and in a 26" barrel you would get 3019 fps but with a peak pressure of 61,800 psi. The maximum service pressure is 63,000 psi so you would be pushing the envelope. With just another 0.1g of powder, you would be producing 3023 fps (a gain of 4 fps) but at a cost of 62,200 psi. I'm not sure you could get 61 grains of powder into the 6.5-06 case but even if you could, it would be foolish to do so without working up from, say, 59.0g which should deliver 2930 fps at 55,800 psi.

    I hope this helps.

    -JMS
    not a mile away then ?

    sounds like great medicine for all our deer species!
    Right where's those stones , I'll start !

  6. #6
    139gr scenars,142gr smks,140gr smks,140gr nosler customs,50,6grs of n160, have started pulling and reducing loads as primers were showing signs of pressure, I did load same bullets with 50.6grs of rel 19, still the same, feels too hot, kept a few to chrony out of curiosity

  7. #7
    Quote Originally Posted by swarovski View Post
    139gr scenars,142gr smks,140gr smks,140gr nosler customs,50,6grs of n160, have started pulling and reducing loads as primers were showing signs of pressure, I did load same bullets with 50.6grs of rel 19, still the same, feels too hot, kept a few to chrony out of curiosity
    Until you chrongraph the loads you're flying in a fog. I'd concentrate on getting that done asap. Dual chrongraph readings would allow you to calculate the actual BC of your bullet for your location.~Muir

  8. #8
    Quote Originally Posted by JMS906 View Post
    It seems unlikely. You don't say which bullet you are using or which powder. But the following is indicative.

    Quickload states that with a Hornady AMAX 140g bullet, 61.0g of N165, and in a 26" barrel you would get 3019 fps but with a peak pressure of 61,800 psi. The maximum service pressure is 63,000 psi so you would be pushing the envelope. With just another 0.1g of powder, you would be producing 3023 fps (a gain of 4 fps) but at a cost of 62,200 psi. I'm not sure you could get 61 grains of powder into the 6.5-06 case but even if you could, it would be foolish to do so without working up from, say, 59.0g which should deliver 2930 fps at 55,800 psi.

    I hope this helps.

    -JMS
    Hi JMS.
    I know very little about Quickload but the 61.0 Grains it has given you is a full 10 Grains over the Nosler Max Load for the 140 Grain Bullet with N165 in the 6.5-06. That would seem a heck of a discrepancy. Am i misunderstanding something?

    Yorkie.

  9. #9
    Quote Originally Posted by Yorkie View Post
    Hi JMS.
    I know very little about Quickload but the 61.0 Grains it has given you is a full 10 Grains over the Nosler Max Load for the 140 Grain Bullet with N165 in the 6.5-06. That would seem a heck of a discrepancy. Am i misunderstanding something?

    Yorkie.
    No, you are not missing anything. I didn't look in any reloading manual. The example I gave was simply to illustrate what was required to deliver the velocity 'swarovski' was seeking, and also to indicate that it means playing around at maximum service pressures - presuming that his barrel behaves as QuickLoad suggests. If his barrel produces pressures higher than QuickLoad predicts, then he would be exceeding the design limits of his rifle and heading towards proof loads pressures. Which is why I said it would be a foolish thing to do.

    Moreover, using the appearance of spent primers as a means to guage (I mean guess) pressures is also foolish because it is unreliable. Page 55 of Speer's 13th Reloading Manual explains why and presents a nice photograph of three spent primers all of which look the same. One is a soft load, one is a normal load, and one is 20% over load. But they all look the same. Similarly, I have had very flattened primers in perfectly normal factory loads. Yes, if your normal load doesn't flatten primers and a higher powder charge does flatten the primers - all other components being the same - it indictaes higher pressure but not necessary excessive pressure.

    OK, looking in the Hornady reloading manual (6th edition) it indicates normal velocities for the 6.5-06 with a 140g bullet are 2500-2800 and maximum loads deliver 2900fps. Maximum load for N165 is 50.4g, which is 10.6g below what is required for swarovski's 3075 fps target. Therefore his desired velocity appears unobtainable within service pressure.

    -JMS

  10. #10
    Hi JMS.
    It was the difference between the Quickload and the Manual Data that suprised me. If Quickload predicts that 61 grains is running at maximum but safe pressure it would seem to differ greatly from Lab tested Data in the Manuals. Just how accurate is Quickload?

    Yorkie.

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