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Thread: More 260 queries!

  1. #1

    More 260 queries!

    Following a lot of brilliant help I got on this thread: What 260 (6.5mm) bullets are you having success with?

    I settled on N160 as the powder of choice for me - throws Nosler 120 BTs through the same hole and Accubond 130s under half an inch when I do my bit. Had the chance to run the loads through the chrono last night though and a bit surprised by the results, much slower than I was expecting:

    42.3gn N160, 120gn BTs - 2611 , 2588, 2641 - average 2,613fps
    40.8gn N160, 130gn Accubond - 2555, 2536, 2532 - average 2,541fps

    Those are definitely the sweet spot loads as 0.3gn above and below and the groups start to open up.

    As per the other thread, I've tried a load of powders now (N160, H414, H4350, R17), 3 different primers and multiple jumps to lands, and the loads I've settled on seem by far the most accurate, but was expecting velocities in the 2700 - 2900fps for bullets in the 120-130gn range. Am I chasing unnecessarily velocity by messing around further??

    Edit - barrel is 21" pacnor

  2. #2
    This is not a surprise....your loads are VERY mild ! Im using N-160 and about 45gr. with Hornady 123gr. a-max and getting 2800fps. According to QL max load with 123gr. Scenar and N-160 is 47.8gr.

    My mild load is 139gr. Lapua scenar with 41.3gr. of N-160 which I chrono at about 2600+. The barrel is 24".

    My favourite load is 123gr. a-max and 46.5gr. of RL 19 which gives me 3000fps.
    Last edited by Konnari; 16-04-2015 at 11:56.

  3. #3
    Doesn't seem to like the hotter loads, groups quickly open out. Was hoping for a bit more velocity tbh, but in fairness it's not a big deal at general stalking distances and I can dial in a few clicks if on the hill.

  4. #4
    Quote Originally Posted by Konnari View Post
    According to QL max load with 123gr. Scenar and N-160 is 47.8gr.
    In my experience this load would be definitely too much. Even 45gr N160, 0.5mm jump has been over pressure in 3 different barrels. Vihtavuori lists 44.6gr max.

  5. #5
    Quote Originally Posted by 75 View Post
    Doesn't seem to like the hotter loads, groups quickly open out. Was hoping for a bit more velocity tbh, but in fairness it's not a big deal at general stalking distances and I can dial in a few clicks if on the hill.

    how far did you go?
    often find a low charge accuracy node followed by incrementally increasing groups followed by a high charge accuracy node at the upper range

  6. #6
    Quote Originally Posted by jthyttin View Post
    In my experience this load would be definitely too much. Even 45gr N160, 0.5mm jump has been over pressure in 3 different barrels. Vihtavuori lists 44.6gr max.
    vihtavuori in my experience is always conservative with there data , excellent propellants though!
    Right where's those stones , I'll start !

  7. #7
    I had great and consistent success with Re17 - 43.2gr and 120gr BT's plus several other bullets.

    Set your die to seat the bullets to maximum length, test a series of charges until you are getting acceptable-ish groups somewhere near 2,900fps or just short of pressure signs. Then start testing this load with the bullet seated progressively deep into the case neck. I use the entirely scientific measure of a half turn down on the seating die each time. You will hit a sweet spot.

    2600fps for a 120gr bullet in a 260 is limp to say the least.
    Brian.

    Just because you are paranoid, doesn't mean they aren't out to get you......

  8. #8
    As long as the first shot from a cold barrel goes where you want it to, forget about groups. Chuck a second downrange after a minute to verify the first, but if this is a stalking rig, you shouldn't need to worry about the barrel getting hot and affecting POA.

    Bump up the load to get velocity - the barrel is shorter than the books use for testing - and you'll be good to go.

    As others have said, this is a light load. Ok, mine's a x55mm so different in many ways, but I have 46.7 N160 pushing 140gr SSTs at 2,660fps from a 22 7/8" barrel, but you should be quicker...
    Sako 75 6.5x55mm-Z6i 3-18x50. MauserM12 .308-SIII 6-24x50. Beretta 690 III Field 12b.
    "You have enemies? Good. That means youve stood up for something, sometime in your life."
    Sir Winston Leonard Spencer Churchill (1874-1965)

  9. #9
    Click image for larger version. 

Name:	Reloads.jpg 
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ID:	55485 I know this was from my 6.5x55, but I found the sweetspot on the short Sako 75 Finnlight barrel was with 46gr of N160 for the 129gr SST's that I was using at the time. When these were chrono'd they came out at 2762fps according to my records.

    Obviously this was a safe load for my rifle which i worked up to and found no pressure signs at all, in no way do i advocate it for your rifle as a starting load. If your case capacity makes it possible then perhaps try working up to a another good timing node which you may find at a higher velocity. It has to be worth a try. It is a load at the top end of the Lee book loads, but nowhere near in excess of a book load, so it should be achievable for your .260.

    I found N160 to be the best powder for my 6.5's, two Sakos and a Blaser, although RL15 worked well and i have friends who swear by Varget for the 6.5.

    I will be interested to hear how you get on with this.

    Simon
    Blindness to suffering is an inherent consequence of natural selection. Nature is neither kind nor cruel but fiercely indifferent.

  10. #10
    im using 46.2 grns n160 and seirra 120 spitzer chronoded at 2650

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