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BigSlick · January 25, 2005, 05:50 PM

Hi guys,

I recently ran a batch of 10mm loads on the 550. As a final check, I measured OAL of each round. Max OAL spec is 1.260. I usually seat to 1.257 OAL. This allows for different brands, shapes of bullets. I use medium range loads so no signs of excessive pressure.

When measuring the latest batch, actual OAL varied from 1.249 - 1.257. The seat die is tight, clean and hasn't been moved in the last several batches. I know 8 thousandths may not make a huge difference on many longer calibers, but after seating then .003 short of published max OAL, the .008 of slop is making me wonder a little. Is 1.249 possibly/probably too deep ?

How consistent are your seat dies ? Do any of you get such a variance ?

Thanks for the feedback

BigSlick

January 25, 2005, 05:50 PM	#1
BigSlick Senior Member Join Date: January 25, 2005 Location: Texas of course Posts: 277	Seat depth variance Hi guys, I recently ran a batch of 10mm loads on the 550. As a final check, I measured OAL of each round. Max OAL spec is 1.260. I usually seat to 1.257 OAL. This allows for different brands, shapes of bullets. I use medium range loads so no signs of excessive pressure. When measuring the latest batch, actual OAL varied from 1.249 - 1.257. The seat die is tight, clean and hasn't been moved in the last several batches. I know 8 thousandths may not make a huge difference on many longer calibers, but after seating then .003 short of published max OAL, the .008 of slop is making me wonder a little. Is 1.249 possibly/probably too deep ? How consistent are your seat dies ? Do any of you get such a variance ? Thanks for the feedback BigSlick