I am loading 12 gauge with a Hornady Apex with a setup that should produce 1200 FPS with 1 1/8 oz#9 with AA hulls, & Win 209 primers. The book says I should be at 17 grains of Red Dot for this. My previous powder bushing was dropping 18.5 grain, so I made a call and ordered the correct one. I cycled the new, smaller busing through a few times and it is still dropping 18.5 grain. I had the next smaller busing, so I put it in and got it down to 18.1. I have two questions for the group: 1. Has anyone solved a similar issue with multiple powder bushings dropping the same amount of powder; and if so, how did you solve it. I am thinking of just dropping down two sizes from the smallest I have and checking the grain weight then. 2. My crude math tells me that 1grain is roughly equivalent to 400 psi. Having shot the loads at 18.5 grain, they are bearable. Should I be concerned with the higher pressure in the loads I already have loaded at 18.5 gr? Thanks for any feedback. SF Buzz
Hello Yes you need to measure the inside diameter of your bushings with a dial caliper.The bload data and bushing size are a great stating point.I have use whatever bushing gets you to your desired powder charge. Is the powder you are using have the same lot numbers or different lot numbers. I have had variance in different lot numbers. Hope that this helps.
Bushing are a volume measurement -- loads are a weighted measurement -- That's the reason I have multiple, same number bushings, marked plus and minus.
