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RCBS Chargemaster Question
bryan6842003
Member Posts: 25 ✭✭
I am hoping to get some other opinions on the auto dispensers.
I bought a RCBS Chargemaster and later on bought a Competition Pro Chronograph.
My question is, I am sometimes getting extreme spreads of 100 to 200 fpm when using either w231, clays, tightgroup with 50 shot groups.
Is that normal? I haven't gone back to my old volumetric dropper to check any velocities but I figure it would be worse.
I have paid extra special attention to the scale to make sure it is calibrated.
I am also wondering if it couldn't be my chronograph. The reason I say this is because it started "missing" shots when this happened, so maybe it could be the battery needs to be replaced?
Thanks [:D]
I bought a RCBS Chargemaster and later on bought a Competition Pro Chronograph.
My question is, I am sometimes getting extreme spreads of 100 to 200 fpm when using either w231, clays, tightgroup with 50 shot groups.
Is that normal? I haven't gone back to my old volumetric dropper to check any velocities but I figure it would be worse.
I have paid extra special attention to the scale to make sure it is calibrated.
I am also wondering if it couldn't be my chronograph. The reason I say this is because it started "missing" shots when this happened, so maybe it could be the battery needs to be replaced?
Thanks [:D]
Comments
I assume you are chronographing handgun loads (based on your powder choices) but it sounds a lot like read errors. You may be too close to the chronograph and muzzle blast is causing errors. Or the sun may be at a bad angle. Or - as you suspect - the battery may be low. The "missed" readings are the major clue that you have a chronograph problem of some kind.
If you guys chronograph, how long do you think the batteries would last in a chrony? They are only a few months old. I disconect the battery between uses, and have only used it a couple of times for maybe 2 hours at a time.
A new alkaline battery should last eight hours of "on" time, but batteries do weaken on their own even if not connected. That's the very first thing to change out when a chronograph is acting weird.
I added a second battery to my chronograph to double the run time. Get a connector from Radio Shack and wire it red to red and black to black so you get double the capacity but still at nine volts.
I had a marathon range day yesterday because it was the first nice weather in a week. I ran my Oehler 35P for six hours straight and never missed a shot. I won't say how much shooting that was, but I ran off almost ten feet of printer tape. 100% perfect readings.
I do keep back about 10 feet from it when I shoot with my pistol just to make sure I am not getting any gasses interefering with the readings.
Assuming the Chargemaster is working properly I'd look at consistent crimp (there really shouldn't be any roll crimp with a .45), uniformity of bullet diameter, uniform seating depth, and make sure you use the same brass brand if you want repeatability.
It could however be the charge too; too light a charge leads to erratic velocity sometimes, as does too slow a powder. With the powders you list the latter shouldn't be an issue and if it is cycling probably not the former.
Are you using the sun screens with the chrono? Could be the issue if you aren't esp. on a partly cloudy day.