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gunlaker
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breech seating bullets over groove diameter
Jan 21st, 2026 at 6:27pm
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Today I had my Wyoming Armory 1885 in 32-40 out to get sight settings with my new Hi-Lux 20x ( Unertl copy ) scope.

I guess I had my breech seater set for one of my other rifles and it was fully engraving the base band.  Previously I was engraving about 1/2 of it.  I knew something odd was happening because there would be lead slivers on the end of my breech seater when I pullet it out!

This is a bullet Steve Brooks made for me.  .322" base band seated in a 0.319" groove.  You can see the whole base band is getting shaved off and pushed to the rear with chunks coming off. 

Still it wanted to shoot.  I did get two really nasty flyers in the 21 ring, but some good clusters in the 25 ring.  There are 3 shots in the cluster @ 6 o'clock and 2 in the cluster at 2 o'clock.  I was surprised it worked that well.  I will probably try my Hoch bullet in this one as it has a smaller diameter base band.   

So maybe a little over groove is OK, but maybe 0.003" is too much!

The target shown is 8 of 10 shots @ 200m.   The two flyers are too ugly to post Smiley

Chris.

  
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bpjack
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Re: breech seating bullets over groove diameter
Reply #1 - Jan 21st, 2026 at 6:59pm
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My 208 gr 3 groove Hoch spitzer shoots well in my Douglas barrel with a .3191 groove barrel.   
Looks like you are on the right track. I get to keep all the high wall seaters that I screw up.  I fix the issue and am close to having one dedicated to each rifle.  That said, I used the wrong one on day two of the RKS bench match at Tommy Mason's range in late June.  I was shooting a different 32-40 for iron sights and left that seater on the bench the next morning.
  
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gunlaker
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Re: breech seating bullets over groove diameter
Reply #2 - Jan 21st, 2026 at 7:13pm
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Yeah I should have dedicated seaters for each rifle.  That would solve some problems.  But I have quite a few rifles so this could get expensive.  Maybe I need a bpjack monthly breech seater subscription.

Chris.
  
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bpjack
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Re: breech seating bullets over groove diameter
Reply #3 - Jan 21st, 2026 at 7:41pm
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Maybe some Frazier river gold every month.
  
ASSRA # 11318
Experience is something you don't get until just after you need it.
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