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preventec47

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    Scott Perkins

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  1. For mostly plinking, I like to use the lightest bullets ( reasonably ) like 135 or 150gr or even 155gr so that I can have the laser beam like trajectories and a lower recoil than with heavier bullets.
  2. Do You have the OAL info for these loads ? Some of these appear to have so much powder that I think they would have to be loaded extra long in order to have enough room in the case ? ? ?
  3. I can only see data for 135gr bullets. Am I doing something wrong ? I think your idea is fantastic as it will be incredibly useful. I have been attempting to do this but badly on all kinds of written notes. Plus it looks like this will be a good time for me to learn the Google spreadsheet application. Hopefully it will be possible to have multiple sort parameters such as 1. bullet weight, 2. powder, 3. velocity etc.
  4. I dont know anything about competitive shooting but if some of are pushing the limits trying to get more power and loading longer etc. Why not just shoot the 10mm which is just like a 40-long ? Scott
  5. If your absolute priority is the softest possible recoil then the lightest possible bullet is your answer. HOWEVER, if you have to make a certain power level and the choice is between a heavier bullet moving at a certain minimum velocity to make the power level or a light bullet moving at the minimum velocity to make the power level, I dont really know which would produce the lightest recoil. BUT, you can google recoil calculators and find a half dozen and you can plug your weight and velocity numbers in to give you the relative recoil result. Of course you would do this after you calculate the velocities per each bullet weight to give you the power levels you need.
  6. Darrell- That is extremely impressive. What powder and charge are you using to get that performance out of the short case .40SW ? I believe that beats most 10mm loads.
  7. Ruple, what brand are your 1000 135gr bullets ?
  8. For self defense, I don't think simply having the hottest load possible is remotely the right choice for developing an effective SD round. ------------- yes of course, I just wanted to acknowledge the possibility that a non hollow pistol bullet might still expand if the nose/core material were sufficiently soft and the bullets velocities were hi enough. Sorta like rifles etc. Thats all I was getting at. Scott
  9. ================================ So to this point if sorted by type we have : 155 JHP = .553 avg flat base 165 JHP = .583 concave base 180 JHP = .62 avg flat base 155 FMJ = 165 FMJ = .55 concave 180 FMJ = .58 flat base 165 CMJ 180 CMJ = .59 flat base 200 CMJ So far as we would expect the solid ( as opposed to hollow) bullets weigh about the same for same weight and the hollow points are .03 and .04 longer for the same weight. I will continue to fill in the blanks until we get this complete. There is an absolute correlation between the case space remaining and pressure spikes. I am ultimately trying to compare different mfgs bullets for length and am considering a soft round nose bullet for self defense round just to be able to get that extra bit of space in the case for powder and pressure expansion. So far the XTREME 155gr bullet is interesting at only .512 length. I am not sure about the toughness of the plating or jacket and whether it can withstand hi velocities. Of course the Nosler and Sierra 135gr hollow points are even shorter.
  10. The recoil depends on both the velocity and the weight of the bullet. Are you suggesting that the Power Factor level with a given bullet implies a certain velocity? I am not familiar with the power factor calculation.
  11. I am compiling a list of bullet lengths from as many 40cal bullet suppliers as I can find. I will share soon when the list is completed. The only XTREME bullet I know about is the 155gr and it has an impressively short .512 bullet length Thanks Scott
  12. I have heard that the Montana Gold bullets do not have a perfectly flat base... That will screw up my calculations just a little bit if I just use the longest length measurement. If they have a concave or recessed base, what I need to do is measure two lengths, the longest length to the rear edge of the side of the bullet and the length to the recessed center of the bullet base. I will just average the two together and that should give me an effective working number to calculate and plot pressures based on remaining case space when the bullets are loaded to the max OAL. My technique for measuring the short dimension of concave based bullets is to but a BB in the center of the base and measure the length of the bullet including the BB. Then I subtract .177" for the diameter of the BB. Thanks
  13. If you want a soft feel it won't happen with 147gr bullets, get some 180gr or 200gr in 40. I personally use 5.1gr WST with 180gr set at 1.180. N320 is also good but more expensive @5.0gr. But if you want real soft 200gr with 4.3gr TiteGroup set at 1.200. CocoBolo. you have it exactly backwards regarding recoil. Think about this both a 22 rimfire and shotgun slug shoot at the same velocities. The only difference is weight of bullet. Which kicks more ?
  14. If anyone is shooting the .40 cal Montana gold bullets I would appreciate a measurement of the bullet lengths taken by caliper for the different lengths. I am plotting some pressure curves based on displaced case space and I need to know the bullet lengths. I was treated pretty rudely by the folks at Montana bullets as they said yea we make em but we dont provide or know the dimension info other than the caliber. They make nine different bullets in 40 caliber. Thanks Scott
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