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Is it me or my seating die????
- Thread starter Wendyj
- Start date
WendyJ, Get yourself a RCBS Precision Mic to measure from the base to ogive. Makes life easier. Once you have your sample OAL round that works for you, check it with the mic. you will see all your rounds will be exact. Measure from the tip to base your numbers will change slightly. Hope I helped
As others have said, not a problem. The stem inside the seating die is ground so that is pushes on the radius (ogive) of the bullet, not the tip. You can get tools to measure your loads that way if you like, but for most loaders it's an added expense that doesn't really change anything. Tips can be inconsistent, especially with hollowpoint match bullets but as long as they fit the magazine and you are using a similar seating stroke on the handle your ammo is good even with the slight OAL variation. If you are that close to the magazine size it might be a good idea to adjust the stem down just a skosh so the longest of the variations are your target size of 2.80
Using a dummy round to adjust a seating round isn't exact, it's just to get you "in the ballpark". You put a 2.800" cartridge in the press and run a die down to just touch it. That's not very precision adjustment. There's enough "thread slop" to be off by .012" and it's no big deal. Just readjust the die when you are seating new bullets. Perhaps your RCBS die has "tighter" threads or fits the bullets ogive better...
I just use dummy round for a close reference. I put it in and when it touches back it off a turn and a half. I usually have to move back down some but it gets me in the ballpark. I did measure to ogive with Hornady bullet compareter and almost 100% on measurements. More in the half thousands range.