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Thread: Which Load(s) would you develop?

  1. #1

    Which Load(s) would you develop?

    Having carefully broken in the barrel on my new R8 6.5x55 I have been developing loads. As is my norm I use new brass at this stage (neck turned) which is then fire formed to refine the load and seating. The conditions for testing were not ideal with a 10-20mph wind which was at least coming over my left shoulder and therefore reduced its effect. I should mention that I fire honed the barrel, very carefully, which I find helps consistency and usually allows a little more velocity without pressure signs.

    Powders tested included R19, H4831SC, Vit N160, H4350 & Varget. Bullets tested were Nosler 120g BT and Sierra 140g Gameking. Lapua cases and Fed210M primers. Seating depth 2.5thou. All targets were 5 shot groups.

    The Sierras proved easy and N160 was the clear winner as below. The grid lines on the target are 20mm.

    ​With the Noslers, H4350 really came on song between 45.4 & 46.6g. Whilst I have previously seen little correlation between S.D., E.S. and group size the S.D. numbers are impressive. My initial thought was to refine only the 45.4g load, but looking again I think the other loads might all be worth a follow up. Your thoughts / comments would be appreciated.

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    Last edited by Frog; 13-04-2013 at 18:46.
    Richard

    Deer Diary

  2. #2
    I'd buy some more Gamekings and Viht N160...

  3. #3
    Thanks Barkingsnake. There's not too much wrong with the G/Kings but I do want to sort the Noslers. With fire formed brass and testing seating depth I would expect to reduce group sizes further and 45.4 is under 0.5" already (if I called the fouling shot correctly) but I'm wondering if 46.6 couldn't become a bughole!
    Richard

    Deer Diary

  4. #4
    Quote Originally Posted by Frog View Post
    Thanks Barkingsnake. There's not too much wrong with the G/Kings but I do want to sort the Noslers. With fire formed brass and testing seating depth I would expect to reduce group sizes further and 45.4 is under 0.5" already (if I called the fouling shot correctly) but I'm wondering if 46.6 couldn't become a bughole!
    How close are you to the max load with that propellant? I've found most rifles like a load about a grain down from the maximum you could use (A "grain" be arbitrary!) without a problem. Not use H4350 but I've seen people spouting on its virtues. I've a pot waiting for test!

  5. #5
    It might go to 2950 but i really don't want to push it any further. No pressure signs yet but I must be getting close and according to Quick Load I'm already there!
    Richard

    Deer Diary

  6. #6
    Hello Frog. Interestingly your group shrunk with the 45.4g load. I'm using the same primers,cases and bullets but use 45.4g of IMR 4350 giving 2,750 ft/s, COL 3.000. These have consistently given sub 1/2" groups and 1/4" cloverleaf (when I can!). The H4350 is similar and use it with 129gr Hornady SP's and Interbonds. I would develop your 120g loads but maybe slow them a little more, 2800 is enough isn't it?

    With your 140gr Gameking's, isn't the pressure a bit on the high side? 140's work very well at 2680 to 2700.

  7. #7
    i must admit ime a newbie to reloading ,but from what ive learnt so far from reading and knowledge ive gained from a knowledgeable mentor
    i would agree with you on the H4350 and 45.4gr . from the look of the powder charges above and below 45.4 the 45.4 charge looks like a stable load
    and with trying different seating depths and possibly neck tensions this could be a THE load
    ​IMO

  8. #8
    The deer man makes a valid point. Quick load predicted 2736 to 2830 with H4350 and I got 2783 to 2885. This did surprise me as generally I have found Q/L pretty spot on. Probably the first step will be to back of the lands and see where this takes velocity. This may well do the trick but if not I will look at coming back off loads for both bullets and look at the results at around 2650-2700 and mid 2700s for the 120s. This would do no harm for piece of mind or case life!

    6.5rem is right in that 45.4 is perhaps the most stable load and this concurs with the deer man albeit based on IMR4350. For hunting I'm not going to fiddle with neck tensions as a) I'm too lazy and b) I'm not convinced that without a custom reamed neck it makes a worthwhile difference. Thanks for your input as its always helpful to get a fresh view. At least I now have good reference points.
    Richard

    Deer Diary

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