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Thread: Search for more precision in a mauser 7.65

  1. #21
    Boolit Buddy nueces5's Avatar
    Join Date
    Dec 2018
    Far south
    Quote Originally Posted by Hamish View Post

    This subject has been discussed and tested in depth within this group of members since before this forum existed.

    The concensus, borne out by being tested by many members over the years is that one should think about the percentage variation within a group rather than one or two points of measurable difference.

    There seems to be very little difference in accuracy between zero variance in weight and about 5 percent. Many have reported little difference up to 10 percent. One, two, three grains will make no difference in a .458 bullet, but apply it to a .226 cast bullet and the percentage goes way up. 15 grains might enlarge the group a bit in a .357, but go ahead, try to get anything less than a shotgun pattern in a .223.

    This is not to say that I am against grouping my bullets weight like you did. When you cast, if you're really in the rhythm, with a big enough sample size, you will find that your castings will fall very close to 2 specific weights, with a few outliers in each direction.

    I don't have enough experience with PC to know how much it throws the variance off.

    With .22 castings, after rigorous visual culling, I weight separate by .2 grains and then load up ammunition boxes by groupings. With .45 rifle castings, I don't bother at all unless I'm really trying to shoot groups. Then, most usually, if the weight is off by more than 2,3,4 grains or so, it's radically off because of a void or a missed surface defect due to culling them with my glasses off.

    Keep weight sorting, it helps eliminate another variable in the equation from being the or one of the culprits. As has been said, how perfect the base of the bullet is, is FAR more important than gross weight variation.

    I am also curious why you re pc'ing them twice. Isnt that unnecessary?
    I do pc twice because I have not been satisfied with the thickness. I think the powder paint I use is not in a thick layer. If I add a lot of powder paint, it simply melts on the baking sheet.
    Now with the weight and controlled diameter, I will strive to achieve a flat base as perfect as possible.
    I make a PC with the boolits standing inside the oven. I will try to take some pictures where I can see how they look.

    Quote Originally Posted by Larry Gibson View Post
    "There seems to be very little difference in accuracy between zero variance in weight and about 5 percent."

    This is correct with most rifles, especially milsurp rifles being shot with issue sights at 50 - 100 yards/meters. However, with really accurate rifles (includes milsurp rifles in excellent condition set up with a scope/match sights for match level competition) proper weight sorting can make a difference at 100 yards and especially at longer ranges. Additionally Proper weight sorting is also quite beneficial for HV shooting at 100+ ranges using rifles that are very accurate to begin with.

    However, I don't think weight sorting will prove of much value if the bullets are PC'd. I just don't see PC'd bullets being competitive where accuracy is the concern such as in CBA matches. In other types of matches such as SASS competitions where targets are close and big PC'd bullets seem to be holding their own.
    I'm just trying to shoot my milsurp rifle at a long distance.
    I will try without a pc. With GC and lubricated with simple lube.

  2. #22
    Boolit Buddy Kegcaissy's Avatar
    Join Date
    Mar 2014
    Got my 1909 peruvian mauser (7,65) at the range today, i was trying NOE 316299 on a 6''X9'' steel plate. With Alox and home made aluminium checks from the pat marlins tool, i got 3/5 at 200Y with open sights!! 16gr of 2400 is the ticket. This bullet also seems to be a good part the solution in this caliber, my barrel slugs at 0.305''x0.311''. More tuning will be done for the powder charge if the groups are not that good next time on paper at 100Y.
    We really need a Ar-15 subforum!

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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