140 RDF Factory Seconds

[Shanerbanner10]

I've been shooting 140 RDF factory seconds for a while. On the website it says they have cosmetic blems that will NOT effect the bullet.
When seating I was getting +\- .005" from the ogive. Is this normal? Is anyone else having that kinda issue?


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[spife7980]

Cant comment on that particular bullet. My 70 gr rdf blems have been pretty consistent but took a long time to figure out they liked to be jumped .05" but the weight and lengths were very accurate. There was a thread about the 175s and a guy was having lots of inconsistencies but Im not sure if he ever reported back on their performance or not.

Have you measured just the bullets themselves unseated? Do other bullets still seat well? Just trying to figure out if its your bullets or your brass. I doubt since youre just starting that you arent shooting a compressed load just yet.

 

[Shanerbanner10]

Definitely not a compressed load. The load shoots fine (.3's give or take at 100). I was just wondering if anyone else has seen the same issue. I don't use a bullet compactor or whatever its called, but a buddy had one and was measuring as we were loading. I just found the numbers to be surprising. I figured the ogive would be the same or very close every time since I was using high quality dies (Whidden).
The brass was freshly FL sized with a .290 bushing and trimmed, chamfered, debured as well.

 

[GhengisAhn175]

Shaner can be a couple things:

A: use your friends bullet comparator on bare bullets. See if you see discrepancies there. IF you do then bullet sorting is in your foreeeable future (if you think it messes up your POI)

B: What kind of seating stem are you using? If it's not "optimal"
for the bullet or leaving slight ring marks you may need a new or polish up your seating stem.
just ran into this with ELD's. I had tangent profiled seating stems when they do better with a secant.

C: You can look up bob green and his comparator. After some initial sticker shock know you can do the same By purposefully seating all your rounds 10'thpusandths long from optimal COAL, take your caliper to them One by one and then re adjust your dies to seat deeper from shortest to longest (or visa versa) so they're all the same COAL and should be same jump.
this works because seating stems seat bullets near the meplat vs the ogive where we measure. We just measure from the ogive because it's more repeatable near the bourlette (widestnpart of the projectile) than further up the ogive near the meplat.

Whether you do A B or C is up to you because they take you to the same end result