1/66 turn conicals - The HuntingPA.com Outdoor Community
 
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post #1 of 8 (permalink) Old 12-22-2011, 01:29 PM Thread Starter
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1/66 turn conicals

i just tried Hornady 1/66 conicals in my long barrel. the conical went down the barrel with ease. i'm used to patched round [censored] needing some effort to get it down the barrel. i put it to paper at 50 yrds. (100gr of 2f) and all 5 shots were about 3" left. am i correct in thinking the loose-ness of the conical going down the barrel would adversly affect the accuracy? i pull one conical to see how it was seating in the riflings and there was evidence of contact. any one have much experience with Hornady's 1/66 conicals?
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post #2 of 8 (permalink) Old 12-22-2011, 02:04 PM
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Re: 1/66 turn conicals

You didn't say what kind of barrel or depth and configuration of rifling. Conicals need to seal the bore and do it in three ways. 1) a very close fit initially, 2) a skirt or hollow base that expands to seal the bore on ignition and 3) obturation ( the effect of the sudden pressure from behind almost acts like a hammer hitting the projectile and causes it to "mash" wider and fill the rifling. Some early black powder cartridge guns depended a great deal on obturation to fill the bore to keep them accurate. On military breech design actually had a post sticking forward in the center of the breech. When the projectile, ball or bullet was loaded it was slightly undersized and when it got down to the breech and came in contact with the post sticking up, the ram rod would be used to bump the soft lead ball or bullet to mash it larger in diameter and press it against the wall of the bore.

I haven't shot a conical bullet in a muzzleloader in 20 years and have no experience with the modern muzzleloader bullets.

Is it soft lead? (can you scratch it with a fingernail?)
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post #3 of 8 (permalink) Old 12-22-2011, 02:28 PM
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Re: 1/66 turn conicals

Quote:
i put it to paper at 50 yrds. (100gr of 2f) and all 5 shots were about 3" left. am i correct in thinking the loose-ness of the conical going down the barrel would adversly affect the accuracy?
This isn't going to be the answer you are looking for, but... use them, and move your windage 3" to the right.

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post #4 of 8 (permalink) Old 12-22-2011, 02:51 PM
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Re: 1/66 turn conicals

With 3 inch groups you don't have an accuracy adversity.
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post #5 of 8 (permalink) Old 12-22-2011, 03:09 PM
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Re: 1/66 turn conicals

I use the Hornady Conical and\or the Buffalo Ballett. They are essentially both the same.

Now, on the Hornady's I clean out a lot of the lube that come's on them. IMHO Hornady just over-does the lube on these things. So, I will sit with a small screwdriver and a piece of terry-cloth and clean out all of the back of the Conical's and give a quick wipe of the excess on the outside.

Now, that being said (you don't need to do this with the Buffalo's) I load 'em over 100gr. Goex FF and I always put a T\C bore button in between the powder and the conical. I do this as I believe (no proof...I just think) that it prevents any excess lube from infiltrating the powder, and I also believe the bore buttons provide a "cleaning" when loading the next conical.

Now, the Conica's do slide down the tube really easy. When I first began to use these I double checked 'em all the time to make sure they were seated. Especially when I would have a long walk, or go up a rough hill. However, I've never had a time when the conical had "fallen" away from the charge.

But, that's been my experience. I have a trust factor in them in my gun now. If you switch to these, check 'em until you build a trust factor. That's the best you can do.

I find these provide a better blood trail than the PRB. I've hit deer before with a PRB and had NO blood trail, only to find them 100 or plus yards they were full of blood.

I think the Conical's give a larger entrance wound....thus....give me something to follow. But....that's just my opinion.

SW
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post #6 of 8 (permalink) Old 12-22-2011, 03:18 PM Thread Starter
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Re: 1/66 turn conicals

Its a green mountain barrel.
It was made by Cabin Creek Muzzleloading in Hallam, PA. I don't know what the depth or configuration of the riflings are.
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post #7 of 8 (permalink) Old 12-22-2011, 05:01 PM
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Re: 1/66 turn conicals


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post #8 of 8 (permalink) Old 12-22-2011, 05:10 PM
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Re: 1/66 turn conicals

My barrel is a GM as well. GM's are 1-70 twist. At least, that's what mine is.

You can check the twist rate in your barrel by simply taking a jag and wrapping a patch around it so when you insert it in the barrel, it will "grab" the rifling. Then, place a mark on your rod and push the rod down the barrel until you get one complete turn of the rod. Or...until you get one-half turn of the rod. (Then you just multiply by 2)

Measure how many inches the rod went down the tube (barrel) until it completed one complete turn. Since your barrel may not be 70" long, then just use half of that, or 35". So, if it takes your rod with the jag\patch 35" of length of going down the barrel to go half way around, then you have a 1-70 twist barrel.

If the rod makes it half-way around in 24", you have a 1-48 twist barrel. And on and on.

SW
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