Question on the 45-70

[hellacatcher]

Got to the range to try it out  won't tell how I did, but put 23 rounds down the barrel it till I quit. But what I would like to know is when reloading do I need to crimp I don't think I seen this in my loading manuals for a single shot. :? It is a hoot to shoot.

[Winter Hawk]

You don't need to crimp to keep from setting the bullet back in the magazine from recoil.  However, crimping will help with developing uniform pressures from shot to shot so your accuracy should be better.

-WH-

[Paul5388]

I have found a taper crimp is much more accurate in my .357 barrel.  I don't know about my .45/70 barrel yet.  Right now I'm using a roll crimp on it.

[Haywire Haywood]

I'm using the Lee Factory Crimp on all my stuff, seems to be doing fine, altho I haven't done a comparison to other crimps.

Ian

[JPH45]

It's a nasty situation, crimping can lead to better and more complete burns. That may or may not give you better groups, all that depends......

You'll ahve to experiment to see what works best in your gun.

[hellacatcher]

Thinks fellows that is what I needed to know.

[Joel]

My late 2 cents.....I've never crimped any of my cartridges for my singleshots and never had any problem with accuracy/velocity once the right combination of "things" is arrived at( right powder,primer, bullet etc). My two NEF's(45/70 and 22 Hornet), Ruger #1(6mm Rem) and Savage 24V (22 Hornet) all shoot minute of angle or less.  I was always taught to crimp only when necessary(magazine rifles).  But everyone experiments, that's part of the great pleasure in shooting.

[Cottonwood]

When reloading with smokeless run your cases after you seat the bullet up the sizing die to just take the belling out of the case mouth.  There is no need to give the case a full crimp.  I learned this from shooting BPCR and have stuck to it.

BTW, my Ultra 45-70 great, I couldn't ask for better groups unless I was shooting for one holers.

[RussB]

When reloading with smokeless run your cases after you seat the bullet up the sizing die to just take the belling out of the case mouth.  There is no need to give the case a full crimp.  I learned this from shooting BPCR and have stuck to it.

BTW, my Ultra 45-70 great, I couldn't ask for better groups unless I was shooting for one holers.

Yep, Works like a charm! Some refer to this as a "Iron-on" or "Press-on" crimp. Whatever you want to call it, it works.  
When chronographing loads, I have found a somewhat lower SD with Iron-On versus full crimp.  In my opinion, and that ain't worth much, it  gives a more "consistent" amount of pressure holding the bullet in the case neck..... Some of the more scientific types may have a better explanation as to the "how's & why's" of this, but that is my impression.
Russ