Is a 1/18 twist too fast for a smokeless muzzle loader?

[norseman1]

Anybody know?Thanks,norseman1

[markb317]

I had a 1-18" twist on my .45 and it shot good.It might be a little fast for sabots but worked very well for sabotless.

[7mmfreak]

I'll know in a month or two. I just ordered a Brux 1-18 after initially ordering a 1-16 which I ultimately decided was a touch faster than I needed. Based on several conversations with knowledgeable people I decided a 1-18 is probably just about right for the bullet weights/lengths we generally shoot in these guns.

[rambler]

Dec 20, 2014 20:35:31 GMT -5 7mmfreak said:

I'll know in a month or two. I just ordered a Brux 1-18 after initially ordering a 1-16 which I ultimately decided was a touch faster than I needed. Based on several conversations with knowledgeable people I decided a 1-18 is probably just about right for the bullet weights/lengths we generally shoot in these guns.

What caliber? ?

[Dave W]

Full forming in a .442/.451 18 twist with very good accuracy.

[7mmfreak]

Rambler,

It's a .450/.458 barrel. My other barrel is a .442/.451 barrel with a 1-24" twist.

[norseman1]

Another question.Does anyone know the thread pitch and diameter of the receiver of a Remington ML receiver? Thanks ahead,norseman1

[Deleted]

1.062 16tpi

[norseman1]

Thank you Sir!!!!

[rossman40]

Thread pitch on a Remy 700 is 1 1/16”x16 or 1.0625" x16. Receiver diameter is right around 1.350" However there is a differnce in threaded (tenon) length between a ML and a CF. CFs are only like .885" while the ML is almost twice that.

[jims]

I missed where norseman1 responded with the caliber he was getting, that would certainly make a difference and the weight bullets he wants to use. I doubt he will have a .375 but my rate of twist there is 1 in 10. On one of my .45s I have a 1 in 28 but that is for bullets 200 grains and lighter for the most part and it shoots excellently. Others I think are at 1 in 20 that I have.
Some say the twist is never too fast but can be too slow.

[sw]

Dec 20, 2014 22:40:23 GMT -5 jims said:

Some say the twist is never too fast but can be too slow.

I'm one of those 'some''. Of course, there's a too fast somewhere. My next 223 sporter barrel will be 8 twist. I normally shoot 40NBTs, occasionally 60 Partitions. I'd go 18 even in a 45 for sabots: just more load flexibility. Ie shoots better with any load.

[Deleted]

Having built a few 18 twist I can tell you they work very well. Accuracy was great with 275-327 bullets. If I build myself another .45 I would likely order an 18 twist..

I really don't know that one could tell a difference in a 22,20 or 18, they all shoot great

[7mmfreak]

SW,

I'm with you and tend to go fast these days. I used to shoot lighter bullets, higher velocities, and just slow enough to stabilize the heaviest bullet I was likely to shoot. These days I shoot heavier bullets with faster pitches and never really get into the "too fast" scenario because of my bullet choices. I opted for the 1-18 over the 1-16 since I ordered that barrel for bullet development and want to shoot as close to the nominal stability factor most guys will have as possible; no reason to go fast enough twist to make a bullet nobody else can shoot.

As for the 1-8 in the .223 Rem, it's just about perfect. I have been shooting one for a few years now and it will shoot anything from 50gn up to 77gn in my gun with good precision. My particular gun loves 69gn SMK and 75gn Hornady OTM.

[edge]

Most 458 win mags are 1:14 and many 45-70's are 1:20

7 years ago dave d. shot his 1:22 and my 1:14 with the same saboted loads and got pretty similar results, but he has stuck by his 1:22.


dougva.proboards.com/thread/4489/45-14-twist-22

edge.

Mar 10, 2007 at 6:51pm
:)well guy's as you can tell i'm having a blast shooting these .45's.i did alittle back to back comparision today at the range and i'm impessed with both.the conditions were 40 degrees with a 5 to 10 mph headwind to start and by the time i shot my last group it was around 45 degrees with a 15 mph headwind.here's how they faired:







this group i called a pull and to confirm i shot a 4th shot.



the top groups were all 100yrds.here are the 200yrd groups.


here are the guns in the test.rem 22twist,sav 14 twist.



here's i few thing's that i have learn about shooting the .45's.one is between the three twist's i have(28,22,edge's 14)they like alot of the same loads.also it seem's like they really like a speed range between 2650 to 2700fps with the sst and barnes.i think that the twist rate is not a big factor but i also think that the smoothness of this shilen 14 twist is also a big factor in it's ability to shoot these saboted bullets.did not have time to shoot sabotless but that will happen next week.sorry for the long post.
ooh one last thing to mention none of these loads were shot with a wad.all my groups have reduced without them and i don't think i will be using them with saboted .40 cal bullet's anymore.

[Deleted]

I have (2) 1:18 twist .451 barrels.
They shoot the 300-327 MHs 1/2 MOA out to 500 yards all the time.
But so do my 1:22 twist .458 barrels.

I really don't know what the threshold is for too little or too much twist in the .45 barrels.

My latest gun has a 1:17 twist .458 Brux.
But I only plan on shooting 7mmfreaks' and Luke's heavier APB bullets in that barrel, when they come out.

[norseman1]

Actually the barrel I am looking at is a Pac Nor 1-18 twist 458 bore with no chambering work done.It will finish out at 25".It is in a heavy Palma contour.It was to be for a 458 Lott build that fell through.There is a lot of steel right there and I would re contour the barrel on my friends lathe.I made an offer and the balls in his park now!!

[bestill]

All info given is great and i believe18 and 20 twist are best suited for longer high b.c. bullets such as match hunter and apb . 22-24 twist shorter low b.c. bullets like sst and ballistic extreme. 250yds and under
All combinations will do well but beyond250 to 500 there will be advantages to proper twist per bullet combinations. JBM has a great bullet stability calculator.
Example imo is i shot250 ballistic extreme from18 twist and from0-250 yds sub moa but beyond that group blows up. I believe bullet over stabilized and becomes rigid flying nose up and accuracy crashes.