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Thread: What a difference .080” makes

  1. #1
    Boolit Buddy
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    What a difference .080” makes




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  2. #2
    Boolit Buddy
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    The tighter group has a patch that’s .080 longer than the larger group


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  3. #3
    Boolit Master semtav's Avatar
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    Interesting. I really need to test some lengths on my patches. So far it's been guess and go.

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  4. #4
    Boolit Master
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    Where did you put the extra .080? More tail? More ogive?
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  5. #5
    Boolit Buddy
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    What a difference .080” makes

    I made them taller and closer to the ogive.

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  6. #6
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  7. #7
    Boolit Buddy
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    I must say, the common wisdom is to patch no farther up the boolit than the ogive but some patched boolits I was given with a mold were patched way past and shot remarkably well.
    I wonder if a tiny bit of patch past the ogive makes for a quicker patch release.

  8. #8
    Boolit Master Lead pot's Avatar
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    ian, can you show me the base of those two bullets in the same order?

  9. #9
    Boolit Buddy
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    Those bullets have been shot buy now but they are similar to this one


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  11. #11
    Boolit Master Lead pot's Avatar
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    ian
    The reason I asked was, if you raised the patch higher on the ogive that you might have exposed more of the base. But what you show there looks good.
    I find keeping the patch right at the transition of the shank and the radius is where I get the best accuracy, but I see a difference in accuracy when the whole base of the bullet is covered, it falls off.
    Those small dimples are right at the end of the shank where I hold the patch.
    The thing is getting the alloy balanced so the bullet does not have to much obturation that the land cuts cut bare lead ahead of the patch destroying the accuracy.
    Click image for larger version. 

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    Here are three bullets with different hardnesses. The first is good the second is almost to soft and the third is to hard and the chance that it will loose rotation.
    Click image for larger version. 

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  12. #12
    Boolit Buddy
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    When I patched up the bullet farther I made the patches longer to make up for it. I still might make them just a tad longer still. I am going to shoot the Shiloh into the pool tomorrow so we will see what happens and go from there


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  13. #13
    Boolit Grand Master Don McDowell's Avatar
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    Ian with the scores you shot at Atterbury, I don't think changing anything would be a good idea.
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  14. #14
    Boolit Buddy
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    Yea your right. I will still shoot it into the pool so that I will know what the bullet looks like when it’s working properly at least


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  15. #15
    Boolit Buddy
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    . I will make a new thread this evening with more detailed notes of what all we tested but here are some more boolits that were shot into the pool. The bullet on the right was shot out of my c sharps highwall and the 2 on the left were out of the Shiloh. Like I suspected the Shiloh with its tighter bore was bumping up further than the highwall. We made the patches for the Shiloh another .040 long. Interesting to note before we started shooting the Shiloh I went to clean the oils out of it like usual and good bit of lead came out. So it looks like the .080 longer patches still are not long enough. We shot a few patches that were .040-.050 longer than the long patches that were shot previous and there was absolutely no leading. We also experimented on how much overlap on the base of the bullet was to much and that does seem to make a difference. The less overlap the better the bases seemed to be. I’ll up load some more pictures and the results of yesterday’s testing this evening.


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  16. #16
    Boolit Master semtav's Avatar
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    Any more testing on your patches ? I wanted to get a bunch of different patch configurations tested but too many obstacles so far. My patches with more overlap seemed to perform better at long range yesterday, but had other issues going on so wasnt a good test.

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  17. #17
    Boolit Buddy
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    Quote Originally Posted by ian45662 View Post
    Were these fired into the pool at full load?
    This picture and the previous one with the three different alloy harnesses makes me think that nose slump may not be a real thing.
    Surely it would show up shooting into a pool!
    An optical comparator would sure be nice to look at the pre and post fired boolits.

  18. #18
    Boolit Buddy
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    They were fired into the pool at full load. The nose bump up on the softer bullets is much more pronounced. Maybe instead of calling it nose slump a more correct term would be nose setback


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  19. #19
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  20. #20
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    Man at the variables we have to deal with to make these shoot! It's great to see the results from bullets that haven't been dug out of a berm.

    What was your alloy for the "softer bullets"?

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check