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Author Topic: Green Mtn. drop in  (Read 860 times)

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Offline jingle

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Green Mtn. drop in
« on: July 24, 2010, 05:25:23 PM »
Hello,

I'm tired of my 1:48 Renegade, and can't afford another rifle. I like the idea of the drop in barrels by Gr. Mtn. I'd like to shoot roundballs at a few rendezvous. What kind of accuracy can I expect from a slow twist drop in? I'll probably switch out the sights, too, to a thin fixed sight. Thanks for the CA sight suggestion a few days ago. Thanks and God Bless! 
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Offline Swampman

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Re: Green Mtn. drop in
« Reply #1 on: July 24, 2010, 05:34:38 PM »
The GM drop-ins work great.  The 1:48 will shoot great round ball groups too.
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"Brother, you say there is but one way to worship and serve the Great Spirit. If there is but one religion, why do you white people differ so much about it? Why not all agreed, as you can all read the Book?" Sogoyewapha, "Red Jacket" - Senaca

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Offline Rangr44

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Re: Green Mtn. drop in
« Reply #2 on: July 24, 2010, 06:29:16 PM »
I just installed fixed sights from Thr Hawken Shop onto the issue 1:48 bbl of my Renegade, and it too shoots PRB's just fine - for a LOT less $$$$ than another bbl.

.
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Offline necchi

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Re: Green Mtn. drop in
« Reply #3 on: July 24, 2010, 07:10:54 PM »
Quote
What kind of accuracy can I expect from a slow twist drop in?

Better than the factory T/C 1-48. There is a break in period.

What are you tired of with the factory barrel?  Proper patch/lube combo and those shoot well also
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Offline coyotejoe

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Re: Green Mtn. drop in
« Reply #4 on: July 25, 2010, 06:28:23 AM »
I've replaced a couple of T/C, Lyman and Traditions barrels with Green Mountain, as have several friends. I and my friends are all very happy with the improvement. It's been my observation, based on experience with quite a few guns, that I just don't expect the shallow groove factory barrels to group round balls much better than 2-2 1/2" at 50 yards. A Green Mountain will hold one inch easily. If I were in the market for a good rifle for offhand competition I'd pick up a cheap T/C, Lyman or Cabelas pawn shop gun and drop in a Green Mountain barrel. With that I'd feel about as well equipped as anyone on the line.
 We tend to speak of the 48" twist as if that were the issue but really it is the very shallow grooves of these button rifled barrels that is the problem for a patched ball. Those grooves of only .004-.005" depth are fine for bullets which expand to full groove diameter on firing but just don't grip a patch like grooves of .010-.014". At one time someone advertised a service to recut T/C 1-48" barrels to deeper grooves. Even T/C, the originator of the "compromise" barrel offered an optional cut rifled 66" twist  barrel with .010" grooves for those who wanted a round ball gun. Lyman also went with deeper grooves and a 60" twist in their Great Plains rifle so I am certainly not the only one who has an issue with the standard, shallow groove 1-48 barrels.
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Offline Swampman

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Re: Green Mtn. drop in
« Reply #5 on: July 25, 2010, 06:36:49 AM »
My factory barrels will shoot 1" groups at 50 yards with PRBs and 80 grains of Pyrodex or 3f Goex but they are harder to load than a GM barrel.  GM doesn't make drop-ins for the Lyman and Cabelas rifles but they can be made to fit.
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"Brother, you say there is but one way to worship and serve the Great Spirit. If there is but one religion, why do you white people differ so much about it? Why not all agreed, as you can all read the Book?" Sogoyewapha, "Red Jacket" - Senaca

1st Special Operations Wing 1975-1983
919th Special Operations Wing  1983-1985 1993-1994

"Manus haec inimica tyrannis / Ense petit placidam sub libertate quietem" ~Algernon Sidney~

Offline coyotejoe

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Re: Green Mtn. drop in
« Reply #6 on: July 25, 2010, 06:57:43 AM »
That's really funny coming from you Swampman because just a couple of years ago you proclaimed T/C barrels to be good only for tomato stakes! ;D
 So what changed your mind?
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The story of David & Goliath only demonstrates the superiority of ballistic projectiles over hand weapons, poor old Goliath never had a chance.

Offline Swampman

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Re: Green Mtn. drop in
« Reply #7 on: July 25, 2010, 07:06:45 AM »
I spent a lot more time working with them.  If you drive the patched ball about 6 inches down the barrel with a mallet to get it started, a T/C barrel will shoot.  This isn't something I'd do in the field.
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"Brother, you say there is but one way to worship and serve the Great Spirit. If there is but one religion, why do you white people differ so much about it? Why not all agreed, as you can all read the Book?" Sogoyewapha, "Red Jacket" - Senaca

1st Special Operations Wing 1975-1983
919th Special Operations Wing  1983-1985 1993-1994

"Manus haec inimica tyrannis / Ense petit placidam sub libertate quietem" ~Algernon Sidney~

Offline coyotejoe

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Re: Green Mtn. drop in
« Reply #8 on: July 25, 2010, 07:41:26 AM »
If you are saying the winning receipt is a very tight patch and ball combo, that makes sense. My .45 Blue Ridge has a shallow groove 1-48 barrel and the best load is a .451" ball with .014" linen patch. That ball is .001" over bore diameter and linen does not compress like cotton so that load is so tight you actually hear it squeak quite loudly as it is rammed down. I don't use a mallet but I do use a solid brass ramrod with a tamping motion to run it down bore. ;D
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The story of David & Goliath only demonstrates the superiority of ballistic projectiles over hand weapons, poor old Goliath never had a chance.

Offline pab1

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Re: Green Mtn. drop in
« Reply #9 on: July 25, 2010, 07:53:53 PM »
Quote from: coyotejoe on July 25, 2010, 06:28:23 AM
Even T/C, the originator of the "compromise" barrel offered an optional cut rifled 66" twist  barrel with .010" grooves for those who wanted a round ball gun.

If I remember right, some of the later original Hawkens were made with 1:48 twist.
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