GTA

All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Big Bore AirGun Gate => Topic started by: rsterne on July 19, 2015, 11:47:51 PM

Title: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: rsterne on July 19, 2015, 11:47:51 PM
I thought it might be convenient if I listed all the designs I have published so far in one place, with the source, design twist, and mold number.... First, from Accurate Molds....

.300 cal - 70 gr. - # 30-070A - 26" twist .... http://accuratemolds.com/bullet_detail.php?bullet=30-070A-D.png (http://accuratemolds.com/bullet_detail.php?bullet=30-070A-D.png) .... designed to fit modified MRod magazine by AirGunLab....

(http://i378.photobucket.com/albums/oo221/rsterne/Bullet%20Casting/300calAirgunBoattail70gr_zpsf8c47a60.jpg) (http://s378.photobucket.com/user/rsterne/media/Bullet%20Casting/300calAirgunBoattail70gr_zpsf8c47a60.jpg.html)

.300 cal - 75 gr. - # 30-075A - 24" twist .... http://accuratemolds.com/bullet_detail.php?bullet=30-075A-D.png (http://accuratemolds.com/bullet_detail.php?bullet=30-075A-D.png)

This is a stretched version of the above, using the lengths of the one below.... will still fit in a modified MRod magazine by AirGunLab....

.308 cal - 79 gr. - # 31=079A - 24" twist .... http://accuratemolds.com/bullet_detail.php?bullet=31-079A-D.png (http://accuratemolds.com/bullet_detail.php?bullet=31-079A-D.png)

(http://i378.photobucket.com/albums/oo221/rsterne/Bullet%20Casting/308calAirgunBoattail79gr_zpsf8dc7f83.jpg) (http://s378.photobucket.com/user/rsterne/media/Bullet%20Casting/308calAirgunBoattail79gr_zpsf8dc7f83.jpg.html)

.308 cal - 95 gr. - # 31-095A - 20" twist .... http://accuratemolds.com/bullet_detail.php?bullet=31-095A-D.png (http://accuratemolds.com/bullet_detail.php?bullet=31-095A-D.png)

(http://i378.photobucket.com/albums/oo221/rsterne/Bullet%20Casting/308calAirgunBoattail95gr_zps3901a401.jpg) (http://s378.photobucket.com/user/rsterne/media/Bullet%20Casting/308calAirgunBoattail95gr_zps3901a401.jpg.html)

.308 cal - 110 gr. - # 31-110A - 18" twist .... http://accuratemolds.com/bullet_detail.php?bullet=31-110A-D.png (http://accuratemolds.com/bullet_detail.php?bullet=31-110A-D.png)

(http://i378.photobucket.com/albums/oo221/rsterne/Bullet%20Casting/308calAirgunBoattail111gr_zps6225d945.jpg) (http://s378.photobucket.com/user/rsterne/media/Bullet%20Casting/308calAirgunBoattail111gr_zps6225d945.jpg.html)

.357 cal - 109 gr. - # 36-109A - 30" twist .... http://accuratemolds.com/bullet_detail.php?bullet=36-109A-D.png (http://accuratemolds.com/bullet_detail.php?bullet=36-109A-D.png) .... designed to fit Korean mags....

(http://i378.photobucket.com/albums/oo221/rsterne/Bullet%20Casting/357calShortBoattail_zps6c4a2c99.jpg) (http://s378.photobucket.com/user/rsterne/media/Bullet%20Casting/357calShortBoattail_zps6c4a2c99.jpg.html)

.357 cal - 127 gr. - # 36-124A - 26" twist .... http://accuratemolds.com/bullet_detail.php?bullet=36-124A-D.png (http://accuratemolds.com/bullet_detail.php?bullet=36-124A-D.png)

(http://i378.photobucket.com/albums/oo221/rsterne/Bullet%20Casting/357calAirgunBoattail_zps90b11b0f.jpg) (http://s378.photobucket.com/user/rsterne/media/Bullet%20Casting/357calAirgunBoattail_zps90b11b0f.jpg.html)

.357 cal - 152 gr. - # 36-152A - 22" twist .... http://accuratemolds.com/bullet_detail.php?bullet=36-152A-D.png (http://accuratemolds.com/bullet_detail.php?bullet=36-152A-D.png)

(http://i378.photobucket.com/albums/oo221/rsterne/Bullet%20Casting/357calLongBoattail_zps66e7b5e8.jpg) (http://s378.photobucket.com/user/rsterne/media/Bullet%20Casting/357calLongBoattail_zps66e7b5e8.jpg.html)

.408 cal - 200 gr. - # 41-200A - 32" twist .... http://accuratemolds.com/bullet_detail.php?bullet=41-200A-D.png (http://accuratemolds.com/bullet_detail.php?bullet=41-200A-D.png)

(http://i378.photobucket.com/albums/oo221/rsterne/Bullet%20Casting/408%20cal%20Airgun%20Boattail%20200%20gr_zpsy7kzb4br.jpg) (http://s378.photobucket.com/user/rsterne/media/Bullet%20Casting/408%20cal%20Airgun%20Boattail%20200%20gr_zpsy7kzb4br.jpg.html)

.408 cal - 252 gr. - # 41-252A - 26" twist .... http://accuratemolds.com/bullet_detail.php?bullet=41-252A-D.png (http://accuratemolds.com/bullet_detail.php?bullet=41-252A-D.png)

(http://i378.photobucket.com/albums/oo221/rsterne/Bullet%20Casting/408%20cal%20Airgun%20Boattail%20252%20gr_zpssanh4iyj.jpg) (http://s378.photobucket.com/user/rsterne/media/Bullet%20Casting/408%20cal%20Airgun%20Boattail%20252%20gr_zpssanh4iyj.jpg.html)

.458 cal - 286 gr. - # 46-280A - 36" twist .... http://accuratemolds.com/bullet_detail.php?bullet=46-280A-D.png (http://accuratemolds.com/bullet_detail.php?bullet=46-280A-D.png)

(http://i378.photobucket.com/albums/oo221/rsterne/Bullet%20Casting/458calBobsBoattail_zps9cd43382.jpg) (http://s378.photobucket.com/user/rsterne/media/Bullet%20Casting/458calBobsBoattail_zps9cd43382.jpg.html)

.458 cal - 385 gr. # 46-385A - 26" twist .... http://accuratemolds.com/bullet_detail.php?bullet=46-385A-D.png (http://accuratemolds.com/bullet_detail.php?bullet=46-385A-D.png)

(http://i378.photobucket.com/albums/oo221/rsterne/Bullet%20Casting/458%20cal%20BBT%20385%20gr_zpshavmgwzs.jpg) (http://s378.photobucket.com/user/rsterne/media/Bullet%20Casting/458%20cal%20BBT%20385%20gr_zpshavmgwzs.jpg.html)

These designs will be stable at airgun velocities in the twist specified.... Some have been tried in slower twists and worked, so the number may be conservative, but that is unproven for most of the designs above.... If you use the recommended twist, or a faster one, you should have no problem.... My design weights are with pure lead or 1% tin, Accurate's weight are with wheel weights, that is why some are different.... Note that these designs are in the public domain, and are free for individual use.... I receive no compensation from Accurate Molds, and have no business relationship with them....

Bob
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: supertech77 on July 20, 2015, 12:22:13 AM
thanks bob, love the 109gr .357,my 201 fire love,s them and puts out 220fpe with them,,the evanix rainstorm 2 is very accurate with them, but guns lacks the power to support the full accuracy and impact this bullet offers,bob you got any designs in 45 .457 .458 in the high 300 and low 400 gr,s,looking for a good bullet for the Texan.i like the accurate mold,s there great quality,
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: rsterne on July 20, 2015, 12:35:04 AM
Tell me the approximate weight you want and I can draw one up and send it to Tom.... A 2.0 cal long will be 320-350 385 gr., I was already thinking of drawing one of those up.... What Meplat would you prefer, 60%, 70%, or 75%.... To give you an idea of what they look like, the .357 and smaller are a 60%, the .408 is 70%, and the 286 gr., .458 above is 75%.... and it is 1.5 cal. long.... High 300s - low 400s sounds heavy for a 500 FPE gun, IMO.... the 286 gr. should work great....

Bob
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: supertech77 on July 20, 2015, 12:44:09 AM
bob a 60% meplat,385 gr .457   and a 425 gr, at 75% meplat .457. sound about right, but as always i am open for suggestions,and recommendations,  thanks
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: Rizen 1 on July 20, 2015, 01:12:50 PM
Great post Bob!  Glad to have all your designs in one place! 8)
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: rsterne on July 20, 2015, 01:14:38 PM
I decided to draw up a longer version of the .458 cal 286 gr.... 2.0 calibers long instead of 1.5 calibers.... It worked out to 385 gr....

I will be submitting this to Tom at Accurate to add to his catalogue.... Note; it will take 4000+ psi and a long barrel (or Helium) to drive a .45 cal. bullet this heavy into the mid 900s....

Bob
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: supertech77 on July 20, 2015, 03:04:03 PM
looks great bob, i emailed tom at accurate mold about this mold, waiting his reply,  thanks again bob,   ;D
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: Matt15 on July 20, 2015, 03:09:10 PM
Bob, could a 30 grain boattail in .25 cal be made?
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: rsterne on July 20, 2015, 03:13:03 PM
Nope, by the time you have a nose and a boattail, there would be no bearing area left to keep the bullet straight in the bore.... Veral didn't even want to do the 52 gr. originally, it took quite a bit of convincing.... any bullet that light will have to be a flat base.... I suggest you contact Mike (CarsonRatSniper) for his slugs (31-45 gr.)....

Bob
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: Matt15 on July 20, 2015, 03:23:44 PM
Quote from: rsterne on July 20, 2015, 03:13:03 PM
Nope, by the time you have a nose and a boattail, there would be no bearing area left to keep the bullet straight in the bore.... Veral didn't even want to do the 52 gr. originally, it took quite a bit of convincing.... any bullet that light will have to be a flat base.... I suggest you contact Mike (CarsonRatSniper) for his slugs (31-45 gr.)....

Bob


Okay. Thanks Bob!!
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: Tofazfou on July 20, 2015, 10:41:13 PM
Im gonna buy that 95 gr 308 mold.  I have a new toy that could use that weight instead of the 118 grs it uses now.  That should speed things up a bit

THANK BOB

you are too 8).......
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: shamu25 on July 21, 2015, 10:55:02 AM
Bob. Love the looks of those boattails.  I was thinking of ordering an Accurate mold for my Extreme .408 with one cavity 200 gr and the other at 252 gr.  I noticed that the 200 is designed for a 1:32 twist and the 252 for a 1:26.  I am thinking that my Extreme is 1:32.  Does that mean the accuracy will suffer with your 252 gr bullet?
Thanks
Ray
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: rsterne on July 21, 2015, 11:19:01 AM
I would ask about the twist rate, I would be really surprised if it is a 32" twist.... the slowest I have seen in the TJ's list is a 24".... If it is 32", there is a possibility that the 252 gr. may tumble with that slow a twist.... or it may be just fine.... Rizen 1 has a .408 Extreme and he asked me to design that bullet for him.... he may know the twist rate....

Bob
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: shamu25 on July 21, 2015, 11:42:14 AM
thanks for your reply Bob. maybe Mike will chime in here with the twist rate, otherwise I will give Brent a call. have a super day, Ray
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: shamu25 on July 21, 2015, 11:59:56 AM
I just talked to Brent, twist rate is one in 32
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: Allen A on July 21, 2015, 04:48:52 PM
Quote from: rsterne on July 21, 2015, 11:19:01 AM
I would ask about the twist rate, I would be really surprised if it is a 32" twist.... the slowest I have seen in the TJ's list is a 24".... If it is 32", there is a possibility that the 252 gr. may tumble with that slow a twist.... or it may be just fine.... Rizen 1 has a .408 Extreme and he asked me to design that bullet for him.... he may know the twist rate....

Bob
Hello Bob...we have customers shooting 275 solids and no problem with bullets tumbling, and yes custom mandrel 1/32 twist...kind regards, Allen
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: rsterne on July 21, 2015, 06:49:23 PM
Boattails tend to need a faster twist, so the 252 gr. BBT may or may not work in the 32".... just have to try it and see.... I think Mike (Rizen 1) has ordered one, so we'll know soon enough....

Bob
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: supertech77 on July 21, 2015, 09:47:39 PM
THANKS AGAIN BOB, THE ORDER # AT ACCURATE MOLDS IS #46-385A   ORDERED MINE
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: rsterne on July 21, 2015, 10:13:57 PM
I added it to the list in the first post as well....

Bob
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: AZAG on August 08, 2015, 12:52:40 AM
Are there any .452 cal?
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: rintafile on August 08, 2015, 01:08:47 AM
You can ask for .452 diameter from Accurate.Just sen email and tell diameter and Tom will make it wider or shrink it.  Offcourse if You shrink .458 to .452 weight should drop a little bit
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: rsterne on August 08, 2015, 01:37:15 AM
Absolutely correct.... Just pick the .458 cal bullet you want and specify the diameter you want (eg. 0.452").... It will be about 2-3% lighter....

Bob
Title: Re: Bob's Boattails.... Accurate Molds (.30 - .45 cal)
Post by: supertech77 on August 08, 2015, 11:04:25 PM
bob, tom at accurate mold just finished my 458/385gr you designed for me, it shipped today,think maybe next i will send it to his guy to have them hollow point the mold.will reduce the gr of the bullet, but i thing all will work out great,out of the Texan,that guns a monster,with 340gr,470 fpe. ;D