HuntingNet.com Forums - Need For Faster Twist

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I'll shoot those bullets from a 1:26 for you, but would prefer a .452" bullet.

I may try these next summer: http://www.pittmanbullets.com/accumax-452-series/

Quote:

Originally Posted by BarnesAddict (Post 4239019)

I'll shoot those bullets from a 1:26 for you, but would prefer a .452" bullet.

I may try these next summer: http://www.pittmanbullets.com/accumax-452-series/

Notice that the Accumax 275gr is (not recommended with sabots) also. They however shoot fine in a 45cal ML sabotless although im skeptical a 1-28 would be enough unless you can achieve 2500fps+. That speed is easy with a 45cal SML.

Look at the high end 416 SMLs bullet weight. http://www.swinglock.net/416SLTover.html

Quote:

A significant advantage with .416 caliber is that available bullets have higher ballistic coefficients than .45 caliber bullets of equal weight which gives the .416 a long range edge with flatter trajectories at equal velocity capability. These rifles can shoot bullets from the 300 gr Barnes TSX with an advertised B.C. of .298 up to the 450 gr Rocky Mountain Match Hunting bullet with a calculated B.C. ( at 2700 fps ) of .880.
The 325 gr Rocky Mountain long range flat base bullet shown with the target below has a very high calculated B.C. of .559 at 2600 fps. 350 gr, 375 gr and 400 gr high B.C. bullets are also available as well as other types and weights.

Can you imagine how big a 45cal bullet would need to be to reach .559 BC?

An interesting concept SH. But except for the limited few shooters that shoot at excessive ranges I'm not sure if the market demand would permit it. I'm sure you could send you rifle to a barrel guy and have him change twist rate. I know Bob Hoyt does an excellent job at relining and rifling a barrel to the twist rate of your choosing.

Quote:

Originally Posted by Gm54-120 (Post 4238988)

I never shot those big Knight 375s for the 52cal. Cost and recoil are just too much. The 325gr FTX with 130gr of BH209 was enough of that. A ASG 310gr bullet made by Rocky Mountain for SmokelessMZ (similar to the Parker MH) probably flies just as flat or better than the big Knight .475 375gr.

I would still love to see something around 240gr in a 40cal cup and core for sabots. A 240gr should fit existing sabots. The PR bullets fit them and they make upto a 260gr. A 40cal 230gr or 240gr should also still shoot in a 1-28.

A BC of .275 should be a cake walk considering a 200gr SST is around .250.

Do get what you want in 40cal won't be in Brass. Lead or Copper is gonna be the best way.

CEB made these 40cal 240gr. People have tried shooting them in twists from 1-14 to 1-22 with sabots....Wouldn't shoot with sabots.

I am assuming that was tested from a .45cal correct?

I personally think that a gain twist starting at 1-100 and going to what ever is suitable for the bullet you wish to use would work far beyond what we can get to work in a strait standard twist.

Quote:

Originally Posted by Gm54-120 (Post 4239379)

CEB made these 40cal 240gr. People have tried shooting them in twists from 1-14 to 1-22 with sabots....Wouldn't shoot with sabots.

Looks like a high BC bullet, but doesn't look like it would be good on game unless you went for bone. Looks like it would pencil like a Barnes would at BP speeds.

Quote:

Originally Posted by lemoyne (Post 4239387)

I personally think that a gain twist starting at 1-100 and going to what ever is suitable for the bullet you wish to use would work far beyond what we can get to work in a strait standard twist.

Man there's a term I haven't heard in a coons age! I had a few of those "progressive twist" barrels back years ago for a couple of my bench queens. They honestly weren't worth the added expense. They did last a tad longer as the throats didn't get blown out as quickly. But I only saw around 20fps on average faster than a standard twist and little to no effect on accuracy. Never tried one for a smoke pole though. Thinking about it, you may be on to something lemoyne. They probably would be better with a big bullet weight. Would probably be especially good for a full bore connie.

Quote:

Originally Posted by super_hunt54 (Post 4239386)

I am assuming that was tested from a .45cal correct?

Yes all sabot tests were done in 45cal SMLs. They shoot very well though in several 40cal SMLs sabotless. Even a relatively slow (for 40cal) barrel. So the twist is not the problem. They were also shot in a polygon rifled 40cal barrel with good results.

CEB will make pretty much any bullet you want. Thats how this bullet got its start. A couple people on a smokeless forum had them make it.

Its my opinion that if they dropped the weight down to....220gr and used a ogive similar to the Barnes 195gr they would shoot in sabots. The BC though would suffer a great deal.