buckstix
(.400 member)
19/12/13 09:10 AM
Re: 505 GIBBS MAUSER - resizing .510 bullets & reduced loads

Hello all,

With a break in the sub-zero days here in Wisconsin, I did a little more load testing with some reduced loads.

I found very little reloading info when searching the internet forums for reduced loads. These were the only ones I located.

The following loads were found on the internet.
THESE ARE NOT TESTED - USE THEM AT YOUR OWN RISK

bullet ---------- powder in grains --------- velocity
525 ------------- 90.0 IMR 4064 ------------ 1750
600 ------------- 50.0 AA 5744 ------------- 1450
600 ------------- 55.0 AA 5744 ------------- 1540
680 ------------- 45.0 AA 5744 ------------- 1350


I also emailed Accurate Powders and asked them for load data for 505 Gibbs using 5744 powder.
This is what they sent me. THESE ARE NOT TESTED

bullet ---------- powder in grains --------- velocity
535 ------------- 55.0 AA 5744 ------------- 1600
535 ------------- 62.5 AA 5744 ------------- 1800
535 ------------- 70.0 AA 5744 ------------- 1900
600 ------------- 52.0 AA 5744 ------------- 1525
600 ------------- 58.5 AA 5744 ------------- 1650
680 ------------- 65.0 AA 5744 ------------- 1800


The following loads were tested in my rifle - 21" barrel.

bullet ---------- powder in grains --------- velocity
350 ------------- 55.0 IMR 4198 ------------ 1630 (short case)
350 ------------- 55.0 IMR 4198 ------------ 1590
525 ------------- 56.0 AA 4744 ------------- 1500
525 ------------- 60.0 AA 5744 ------------- 1600





With the weather so cold, I didn't do my best for groups, but did get an idea of what to try next.



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