.40 cast Bullets

[smokepolehall]

Is a 18 hardness a hard cast bullet ? I went & researched it & it's a hard cast bullet. That's not what i am looking for & i have 200 of them now. I will just use them to develop a load for that weight

 

[eekjellander]

Is a 18 hardness a hard cast bullet ? I

(ABSOLUTELY!!!!) I consider 15 hard , my 530 gr PP is 10.4 (20-1)@ long range (700 yds) Lee or Cabin tree tester /Ed

 

[smokepolehall]

Live & learn, my fault but a learning curve. I got the bullet sizer & punch in for .397 & .398. They are smooth sided no threads to install on my RCBS press. I used a ballpeen hammer & set sizer on a socket & tapped it through. The .397 is correct for the Coleraine barrel. Those are hard cast bullets so i spect they be harder to knock through.

 

[eekjellander]

Live & learn, my fault but a learning curve. I got the bullet sizer & punch in for .397 & .398. They are smooth sided no threads to install on my RCBS press. I used a ballpeen hammer & set sizer on a socket & tapped it through. The .397 is correct for the Coleraine barrel. Those are hard cast bullets so i spect they be harder to knock through.

I suspect you want .398 /what weight then , I will look at what Accurate has and give you the item #. See your PM i responded to/Ed

 

[smokepolehall]

I suspect you want .398 /what weight then , I will look at what Accurate has and give you the item #. See your PM i responded to/Ed

I see 2 that hopefully would shoot well. 40-215F & 40-220 P. Both are single grease /lube groove. Do you think either will work well ?

 

[eekjellander]

I see 2 that hopefully would shoot well. 40-215F & 40-220 P. Both are single grease /lube groove. Do you think either will work well ?

Depends on the shooter/powder type/charge but your barrel will tell you for sure . /Ed

 

[smokepolehall]

I will be using T7 3F & Swiss 3F

 

[edmehlig]

It would be interesting to see between the two what gives you better accuracy with the same load.

 

[smokepolehall]

I have the 2 barrels & i think the slower twist will use the 175 gr . Guess i will find out, i don't own a Chrony. I am just going to get the best accuracy i can.

 

[Harleysboss]

I was playing around on a twist calculator that I have used with success when trying to design a bullet mold and I came up with a bullet that is .90 in length, .400 in diameter, shot at 1400 fps using lead will be right in the neighborhood for your 1-24 twist barrel. Accurate shows a mold 40-280Q with pretty close to those parameters. The good old "I" bullet is a proven shooter. Maybe an email to Accurate asking to design a 40 cal version using the "I" bullet design at your specs.
The twist calculator that I often use is kwk.us/twist.html free on the web. Trying to find the perfect over the counter bullet for your chosen caliber may be a frustrating journey.

 

[eekjellander]

I was playing around on a twist calculator that I have used with success when trying to design a bullet mold and I came up with a bullet that is .90 in length, .400 in diameter, shot at 1400 fps using lead will be right in the neighborhood for your 1-24 twist barrel. Accurate shows a mold 40-280Q with pretty close to those parameters. The good old "I" bullet is a proven shooter. Maybe an email to Accurate asking to design a 40 cal version using the "I" bullet design at your specs.
The twist calculator that I often use is kwk.us/twist.html free on the web. Trying to find the perfect over the counter bullet for your chosen caliber may be a frustrating journey.

He has chosen a 40-215F and 40 -220 P from Accurate page 14 ,what s your calculations on That ? /Ed

 

[Harleysboss]

Plugging the numbers off of those two Accurate molds and using a speed of 1400fps (just a guess) I came up with 1-33 and 1-32.

 

[smokepolehall]

Plugging the numbers off of those two Accurate molds and using a speed of 1400fps (just a guess) I came up with 1-33 and 1-32.

So going by numbers i could use a bullet weight & length heavier & longer ? If you have time what would a 1:48 twist allow ?

 

[Harleysboss]

Yes, for your faster twist barrel the numbers show that a bullet that is in the area of .90 inch long X your bore diam .400 shooting at 1400-1500fps should be just about perfect for the 1-24 twist. I will plug in some numbers and see what the twist calculator shows for 1-48. I'm thinking a round ball may be ideal? I've never played with a 40 cal. Lunch is bout over. I will post some findings later in the day (west coast for me)

 

[Harleysboss]

Looks like that 1-48 twist barrel is going to take a mighty short conical, like around .50" length. Checkout Accurate #40-135P that one specs out using that data at 1400fps, Showed 1-44 twist. That would be a nice little thumper. Maybe the round ball will be the better choice?