rbstern
05-17-2006, 02:08 PM
I shot two, similar 357 magnum loads recently, and trying to interpret differences in pressure signs. Gun used for both loads was S&W Model 66 with 4" barrel, starting with a clean barrel in both cases.
Load 1:
Lyman 358477 SWC 158 grain wheel weight alloy, pan lubed (3 parts candle wax, 1 part kerosne, 1 part Dexron ATF), sized .358
12.0 grains WC820 (hi-tech/"H110" speed)
1.577" COL
Remington 1 1/2 primer
Good accuracy, fairly clean barrel, primers flattened
Load 2:
Lee 358158 round nose, 158 grain wheel weight alloy, tumble lubed with Lee Alox, unsized at .359 +/- .0005"
12.0 grains WC820 (hi-tech/"H110" speed)
1.600" COL
Remington 5 1/2 primer
Fair accuracy, moderate leading, primers well rounded
It's the primers that have me scratching my head. While these are not apples to apples loads, they are close. Bullet shape and lube are the only difference.
I expected more pressure signs in the load with magnum primers, and got exactly the opposite. Any thoughts?
Load 1:
Lyman 358477 SWC 158 grain wheel weight alloy, pan lubed (3 parts candle wax, 1 part kerosne, 1 part Dexron ATF), sized .358
12.0 grains WC820 (hi-tech/"H110" speed)
1.577" COL
Remington 1 1/2 primer
Good accuracy, fairly clean barrel, primers flattened
Load 2:
Lee 358158 round nose, 158 grain wheel weight alloy, tumble lubed with Lee Alox, unsized at .359 +/- .0005"
12.0 grains WC820 (hi-tech/"H110" speed)
1.600" COL
Remington 5 1/2 primer
Fair accuracy, moderate leading, primers well rounded
It's the primers that have me scratching my head. While these are not apples to apples loads, they are close. Bullet shape and lube are the only difference.
I expected more pressure signs in the load with magnum primers, and got exactly the opposite. Any thoughts?