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I reload for my 1894c with 180gn,H-110, I would like to know what is your preferred C.O.L. I trim to 1.280 & seat my bullet to 1.581 & finish with 1.580 once crimped. Reloading carbine 357 mag is new for me, I mostly reload for long range 308W shooting out to 600 & 800 Meters . How important is for this round to be perfectly C.O.L that every bullet is exactly measured to 1.580 C.O.L will C.o.L at 1.581,82,83 make any difference on accuracy.
 

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I seat to 1.580" and finish at 1.580" using a Hornady 158 gr. XTP-FP and Lil Gun in Starline brass. I use a Lyman Carbide, 3 dies of a 4 die set, but I finish with a Lee Carbide Factory Crimp Die. My Italian Win 92 Trapper Clone isn't fussy about COAL lengths within reason.
 
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For my 1980 Marlin 1894C,I load Hornady 158gn XTP HP w/16.5gn H110,COL 1.580”
My 2 Henry steel boys love it too.1/2” @ 50 yards
 

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At first I was scratching my head trying to figure out what those numbers were you posted. I assume now that the 1280 trim is 1.280" and the 1581 COL is 1.581". The 1894C has a maximum COL of 1.60"-1.61". A cartridge longer than the required maximum can cause a feeding problem that can jam up the rifle because the lifter tries to lift the cartridge before it is all the way out of the tube and a second cartridge slips past the stop.

As for using a different COL with the 180 grain bullet or any bullet for that matter, accuracy may or may not be affected but pressure certainly will. What does your manual call for COL? What ever bullet you are loading it should have a crimp groove if shot in the 1894C. Measure the difference of seating the bullet at the bottom of the crimp and the top of the crimp. Then you'll know what measurements you have to play with.
 
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