We have been reloading using STS hulls, clays powder, WIN209 primers, 1 1/8 oz shot and blue duster wads. We have used the published data for 1145 fps loads and we do check the weight of our powder drop everytime we got a new powder lot. I chronographed our 1145fps loads yesterday and found out they are very consistant, which is good and around 1200 fps, which is not so good. Our handicap loads that were supposed to be around 1200 fps are actually around 1255 fps. Some other reloaders said the blue dusters create a better seal, thereby producing a faster load than other winchester replacement wads may produce. Unfortunately the info on the blue duster package matches the info in the hodgdon manual.
Anyone else experience this or have any more accurate reloading data for this combination of componants? Would be happy to use a cheaper primer, but I really prefer the rest of the componants.
Well I am using low priced Fiocchi primers with STS hulls and Alliant's book recipes and I am not happy with the weak sounding loads I'm getting but the primers seem to work fine with AA hulls and the STS hulls gave good results with the Winchester primers.
Bruce Em, What's wrong with it is, I don't know, but would believe it quite likely, that I have exceeded the safe pressure limit with that configuration. Not to mention now I know why the recoil been a bit much for me with caps. I'm on the 21 yard line - I don't need to be shooting 1255 fps! But the temperature is an interesting point. I believe it may have been around 78 yesterday - I'm thinking that should not have been a factor.
Barrel length will also affect velocity. A lot of data is compiled with 28 and 30 inch tubes and most of us shoot 32 or 34 inchers. Could help with Your EXTRA velocity.
If you are using a chronograph made for the casual loader that has "Light" screens, it will usually register a higher velocity than the standard induction type of screens used by most testing facilities. A tight choke can also artificially elevate the readings you will get. Your velocities may very well be what you thought they were. If you wish to duplicate the factory loads, drop your powder charge until you obtain the same velocities as the factory shells you wish to duplicate. Dropping a bushing size or a half grain or so with Clays powder might not be a bad idea. I have seen some test results of some "standard" loads that were near the limits. The Blue Duster wads may also increase the pressure slightly. A few shooters that have had some shells pressure tested have experienced some velocity and pressure increases with the Green Dusters while using Clays, so it would not be hard to imagine the same thing happening with the Blue Dusters as well.
At 16-18 grains of Clays to get 1200-1250 fps - you're not going to exceed any safe pressure limits. Velocity is not a reliable gauge of pressure anyway...
Easier to meter powder, working with wads you have, than trying to find a wad to compliment the powder you metered. Any batch of wads can vary +/- due to die configurations from lot to lot...
Stick with what you know and adjust accordingly...
Jay
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