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Unread 12-24-2006, 07:11 AM
Platinum Member
Join Date: Nov 2005
Posts: 1,088
Re: Groups

My rifle is a .458

One major problem with a muzzleloader is that there is an open flash hole when the primer is not in place. This limits powders to the bulkier ones.

Another problem with sabots is that you are looking for a high average pressure but not necessarily a high peak pressure. 70 grains of powder would indicate either a powder in the range of 4227 or 4198.
4227 gives poor accuracy in my rifle at these loadings and 4198 does not burn completely.

Others have found that by using a duplex powder you can tailor your powder speed to match what the rifle likes. I tended to stick with the faster powders for a long time, but could never get much under 1 moa with my groups.

In my 505 Gibbs barreled muzzleloader straight N110 does give good results with a slightly heavier bullet/sabot combo.

J E Custom

In a muzzleloader every load is compressed.

If you look at the picture of my sabots, you will see that they are fully rifled on a lathe. I have never had one strip due to velocity. I did have a problem with the sabot petals not breaking off cleanly which I believe made the sabot tip. This caused fliers from the group by pushing the bullet off course. Finding the correct spot for the petal groove solved that problem.

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Unread 12-24-2006, 03:57 PM
Platinum Member
Join Date: Jul 2004
Location: Texas
Posts: 7,233
Re: Groups


As one of the other guys said you know a hell of a lot
more than I do about muzzle loaders but what I ment by
compressed loads was when I tried duplex loading
I was told to compress each powder as it was placed in
the barrel.this helped to minimize mixing and finger
nailing (allowing slower powder to get behind the faster
priming powder charge. As this would cause different
burn rates.

It looks like you have gone to a lot of trouble with the
sabots so I am not sure what you can do to improve over what you all ready have.

I had trouble geting under 2moa @ 100 yrds so I switched
to heavy lead bullets and barns x ( 620 gr sp fb 50cal &
500gr triple shocks for my 45cal) I know that they rainbow
badly but will shoot 1 to 1.25 moa at 600 yrds with iron
sites and retain lots of energy.

Also I use the 450gr & 500gr triple shock in a 45/110 sharps
loaded with 777 and it shoots under 1moa (.812 best so far)

I am interested in what you come up with so please post the results.

good luck
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